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1.
Processes of forest regeneration in two unlogged areas and in three areas that were logged nearly 25 years ago were quantified in Kibale National Park, Uganda. For forests to recover from logging, one would predict recruitment and growth processes to be accelerated in logged areas relative to unlogged areas, facilitating increased recruitment of trees into the adult size classes. We examined this prediction first by determining the growth of 4733 trees over a 51 to 56 month period and found that growth rates in the most heavily logged area were consistently slower than in the two unlogged areas. In contrast, the lightly logged forest had similar growth rates to unlogged areas in the small size classes, but trees in the 30 to 50 cm DBH size cohort exhibited elevated growth rates relative to the unlogged areas. Mortality was highest in the heavily logged areas, with many deaths occurring when healthy trees were knocked over by neighboring treefalls. We found no difference in the density or species richness of seedlings in the logged and unlogged forests. The number of seedlings that emerged from the disturbed soil (seed bank+seed rain) and initially seed-free soil (seed rain) was greater in the logged forest than in the unlogged forest. However, sapling density was lower in the heavily logged areas, suggesting that there is a high level of seedling mortality in logged areas. We suggest that the level of canopy opening created during logging, the lack of aggressive colonizing tree species, elephant activity that is concentrated in logged areas, and an aggressive herb community, all combine to delay vegetation recovery in Kibale Forest. 相似文献
2.
K. S. Seshadri 《Biotropica》2014,46(5):615-623
Vast areas of tropical evergreen forests have been selectively logged in the past, and many areas continue to be logged. The impacts of such logging on amphibians are poorly understood. I examined the response of anuran communities to historical selective logging in a wet evergreen forest in south India. Anuran assemblages in unlogged forest were compared with assemblages in selectively logged forest. Forty 10 m × 10 m quadrats in forest, riparian zones, and streams of unlogged and selectively logged forests were searched at night for anurans. Species richness did not appear to be affected by logging. However, anuran density varied significantly and was 42 percent lower in selectively logged forests compared to unlogged forests. Anuran densities also varied significantly across microhabitats, with highest densities in streams of both selectively logged and unlogged forests. Patterns of niche overlap varied with selective logging as niche breadth either expanded, contracted, or remained neutral for different species. Ordination analysis explained 95 percent of the variation in species assemblage across selectively logged and unlogged forests. The assemblage in selectively logged forest was nested within unlogged forest. Among the habitat characteristics, litter thickness and water depth had the highest influence on the assemblage. This was followed by litter/water temperature, air temperature, and lastly relative humidity. It appears that species richness and composition of anurans in selectively logged forests is converging with unlogged forests, but the effects of historical logging seem to persist on anuran densities and their niche characteristics even ca 40 yr since logging ceased. 相似文献
3.
Xiao‐Dong Yu Chong‐Ling Liu Liang Lü Scott L. Bearer Tian‐Hong Luo Hong‐Zhang Zhou 《Insect Science》2017,24(2):303-313
Selective logging with natural regeneration is advocated as a near‐to‐nature strategy and has been implemented in many forested systems during the last decades. However, the efficiency of such practices for the maintenance of forest species are poorly understood. We compared the species richness, abundance and composition of ground‐dwelling beetles between selectively logged and unlogged forests to evaluate the possible effects of selective logging in a subtropical broad‐leafed forest in southeastern China. Using pitfall traps, beetles were sampled in two naturally regenerating stands after clearcuts (ca. 50 years old, stem‐exclusion stage: selectively logged 20 years ago) and two mature stands (> 80 years old, understory re‐initiation stage: selectively logged 50 years ago) during 2009 and 2010. Overall, selective logging had no significant effects on total beetle richness and abundance, but saproxylic species group and some abundant forest species significantly decreased in abundance in selectively logged plots compared with unlogged plots in mature stands. Beetle assemblages showed significant differences between selectively logged and unlogged plots in mature stands. Some environmental characteristics associated with selective logging (e.g., logging strategy, stand age, and cover of shrub and moss layers) were the most important variables explaining beetle assemblage structure. Our results conclude that selective logging has no significant impacts on overall richness and abundance of ground‐dwelling beetles. However, the negative effects of selective logging on saproxylic species group and some unlogged forest specialists highlight the need for large intact forested areas for sustaining the existence of forest specialist beetles. 相似文献
4.
Conservation agencies are increasingly advocating that the survival of many tropical forest species may depend on disturbed forests and are directing scarce conservation resources to managing logged forests. This requires critical evaluation. In this 10-year study, we quantify tree community dynamics in three selectively logged areas harvested at different intensities and compare their recovery to two unlogged areas in Kibale National Park, Uganda. Over the 10 years, 527 of the original 4840 tagged trees (10cm DBH) died; while the mortality rate was highest in the heavily logged area, it was only significantly greater than one of the unlogged sites. The density of new trees varied significantly among areas being highest in the lightly logged area, but the density of new recruits in the heavily logged area did not differ from the unlogged areas. Overall, the more heavily logged areas had higher growth rates than the unlogged or lightly logged areas. However, there was no difference among areas in the magnitude of the change in basal area; and in both 1990 (20+ years post-harvest) and 2000 the basal area in the heavily logged area was significantly less than the unlogged areas. In general, findings from the heavily logged area suggest that the expectation that in logged areas a number of processes of forest regeneration will be accelerated relative to unlogged forest was not met. Thus, 30+ years after logging evidence suggests that forest recovery will be slower than expected. We also present evidence to suggest that the climate in the region is changing, which may account for changes in the population dynamics of certain species in the unlogged forests. 相似文献
5.
D. F. R. Cleary T. J. B. Boyle T. Setyawati S. B. J. Menken 《Journal of Applied Entomology》2005,129(1):52-59
Abstract: The impact of logging on the relative abundance, species richness and community composition of four butterfly guilds (generalists, herb specialists, liana specialists and tree specialists) was assessed in differentially disturbed logging treatments located within the province of Central Kalimantan, Indonesian Borneo. Logging affected the overall butterfly composition by increasing the dominance of liana specialists at the expense of tree specialists and increasing the species richness of herb specialists and, to a lesser extent, generalists. There was no significant difference, however, in the species richness of liana specialists or tree specialists across logging treatments. The species composition of all guilds differed significantly among logging treatments with the greatest difference between unlogged forest and road sites with older and recently logged forest intermediate between these extremes. Our results indicate that logging has a disparate effect on abundance and species richness within each butterfly guild. We suggest that shifts in the dominance of butterfly guilds are due to large-scale logging-induced changes in vegetation, particularly in relation to liana abundance. The higher butterfly species richness in logged areas on the other hand is probably because of butterfly species associated with open areas entering the logged forest from roads or other large open areas. 相似文献
6.
Sue Baker Leon Barmuta Simon Grove Alastair Richardson 《Biodiversity and Conservation》2009,18(13):3467-3482
Reservation of forest in riparian buffers is common practice in commercial forestry areas worldwide, potentially providing
valuable habitat for biodiversity dependent on mature forest. However, the habitat value of narrow reserve corridors can be
compromised by edge effects. We investigated the habitat value of streamside buffers in wet eucalypt forest for ground-dwelling
beetles in Tasmania, Australia. Beetles were collected with pitfall traps in five replicates of four habitats: unlogged corridors
of mature forest in streamside reserves (buffers) with clearfelling-derived logging regeneration either side; continuous mature
upslope forest; continuous mature riparian forest; and <20-year-old upslope clearfelling-derived logging regeneration. Streamside
reserve widths on each side of the stream were on average 40 ± 6 m (±95% CI) from reserve edge to stream. Beetle assemblages
in logging regeneration differed substantially from those in the unlogged habitats, including the streamside reserves. Streamside
reserve assemblages nevertheless differed from those of the continuous unlogged areas. Assemblage composition in streamside
reserves was most similar to that in continuous mature riparian forest, although beetle diversity was higher in the reserves.
Our results suggest that although streamside reserves provide habitat for the majority of commonly collected beetle species
occurring in continuous mature forest, wider reserve corridors in the wet eucalypt forests of Tasmania may be required to
provide habitat that is not edge-affected. 相似文献
7.
The confounding effects of logging on tree seedling growth and herbivory in Central Amazon
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Light availability is an important modulator of seedling growth and plant–herbivore dynamics. Logging increases light levels in forests, potentially altering herbivore–plant interactions that drive seedling establishment. We conducted a transplant experiment to evaluate how logging and herbivory affect seedling growth and survival in three shade‐tolerant tree species, at paired canopy gap and understory sites in logged forest and an adjacent unlogged area in central Amazonia (Brazil). Seedlings were either left exposed to naturally occurring insect herbivores or protected from insects by a fine netting structure. We measured the herbivore damage and growth rate of seedlings after 18 mo. In general, logged areas received more light than unlogged sites. Growth and herbivory rates were positively influenced by light, and herbivory was also influenced positively by logging. In gaps, increased growth mitigated foliar damage. Logging resulted in a loss of foliar tissue due to increased herbivory. Herbivory rates were higher in the understory of logged sites than in that of unlogged understory sites, but growth was similar in these areas. Thus, the understory of logged areas provided the least favorable sites for shade‐tolerant tree regeneration, due to higher herbivory rates. The effect of logging on biotic interactions can extend beyond the gaps it creates into untouched understory sites. To our knowledge, this is the first time such a pattern has been observed, highlighting the importance of evaluating the impact of logging on biotic interactions. 相似文献
8.
Sini Savilaakso Jenny Koivisto Timo O. Veteli Jyrki Pusenius Heikki Roininen 《Biodiversity and Conservation》2009,18(14):3931-3948
Many of the protected forest areas in Uganda have been subject to logging in the past. It is known that logging changes communities,
but how long these changes last is unclear. Most of the studies on butterflies and moths have looked at the effects of logging
relatively shortly (<15 years) after the logging took place. In this study we investigated community of herbivorous lepidopteran
larvae and its temporal dynamics in a natural forest and three differently managed forest compartments after 40 years of regeneration.
We collected samples of larvae from the leaves of Neoboutonia macrocalyx Pax. between April 2006 and March 2008 in Kibale National Park, Western Uganda. Herbivory, density of larvae, and species
richness were significantly lower in logged compartments than in natural forest. Furthermore, the community composition differed
significantly between the logged compartments and the natural forest. There was seasonal variation in larval density, species
richness and diversity. In species richness and diversity the variation was synchronous in all the study areas, but larval
density did not vary synchronously across the compartments, probably due to the impact of logging on the environment. We also
observed changes in the community composition during different seasons in all the study areas. We attribute the long term
impact of logging to the hindered regeneration of logged compartments and recommend restoration activities to help to return
the logged areas closer to the natural state. 相似文献
9.
Fire regimes have a major influence on biodiversity in many ecosystems around the globe, yet our understanding of the longer‐term response of fauna is typically poor. We sampled bats with ultrasonic detectors in three different years in dry sclerophyll forests of south‐eastern Australia in a long‐term, management‐scale experiment. Frequent low‐intensity burning (every 2 or 4 years plus unburnt) and logging (with 33% retention of the original unlogged tree basal area) were manipulated to assess their effects on bats. We found that both the fire regime and regrowth after logging influenced the local bat community. The routine burning treatment (burnt every 4 years) in unlogged forest was consistently related to higher total bat activity (2–3 times) and species richness when compared to unburnt controls and logging treatments. Foraging activity was more variable, but it was typically lowest in Unlogged Unburnt Controls. These patterns were evident at both the detector site scale and the block scale and were probably due to a reduction in understorey stem density with burning, especially in unlogged forest. Bat activity was significantly lower across the entire study area (including controls) in 1 year, when sampling occurred within 6 months of burning. When pooled across burning treatments, unlogged forest supported higher bat activity (1.5 times) and species richness than logged forest (12‐ to 17‐year‐old regrowth), again most likely because of a negative association with high stem density in regrowth after logging. We conclude that low‐intensity burning had positive benefits for echolocating bats, most notably in unlogged forest. However, careful planning is required to generate heterogeneous vegetation patterns that are likely to be most suitable for a range of taxa. 相似文献
10.
Brian D. Gerber Summer Arrigo-Nelson Sarah M. Karpanty Mary Kotschwar Patricia C. Wright 《International journal of primatology》2012,33(2):305-321
Primates often live in human-altered habitats; Malagasy lemurs are no exception. It is important to understand if habitat
alteration affects primates’ space use patterns across multiple spatial and temporal scales, as this drives population density.
We quantified the daily, seasonal, and annual space-use of seven groups of Milne-Edwards’ sifaka (Propithecus edwardsi) living in unlogged and logged rain forest in Ranomafana National Park, Madagascar between December 2002 and November 2003.
Concurrent data showed that sifakas consumed higher quality foods in the unlogged than in logged forests; thus we explored
how space use patterns were related to energy use strategies. Sifaka groups in the logged rain forest traveled 7–13% less
per day than groups in the unlogged rain forest, despite their larger home ranges (median: 46.12 and 23.52 ha, in the logged
and unlogged forests, respectively). Sifakas may thus use an energy-minimizing strategy at the scale of the individual day
but an energy-maximizing strategy at the annual home range scale. Sifakas exhibited fidelity to the home range across seasons,
but their core area of use shifted considerably with season. We found no difference in population density between sites. However,
given the interannual variability in sifaka foods, a multiyear study is needed to assess if energy strategies observed in
this study are consistent across longer time periods. Our findings suggest that lemurs may persist in logged habitats by altering
spatial use patterns; future work should attempt to quantify the threshold level of forest regeneration from logging that
will allow lemurs to persist at similar densities as in unlogged forest. 相似文献
11.
Bourland Nils Kouadio Yao Lambert Lejeune Philippe Sonké Bonaventure Philippart Julien Da?nou Kasso Fétéké Fousséni Doucet Jean‐Louis A correction to this author affiliation was made after original online publication on July . 《Biotropica》2012,44(6):840-847
Pericopsis elata (Fabaceae) is a tall tree of high commercial value of the moist semi‐deciduous African forests. As a result of decades of logging it is now considered as threatened and listed on the IUCN Red List and CITES Appendix II, even though essential biological parameters controlling its population dynamics remain unknown. This study aims at improving the knowledge of the species' ecological parameters, and at assessing the impact of selective logging on its populations in an 118,052 ha forest in Cameroon. After inventorying the species in 1432 ha, mortality and growth were assessed over continuous 5‐ and 2‐yr periods in unlogged and logged areas, respectively. Phenology was monitored in the unlogged forest during 5 yr. The population structure shows high relative abundance of trees in medium size categories. Mean annual diameter increments in both environments did not differ significantly between unlogged and logged areas. P. elata is a deciduous species that flowers at the end of the main dry season. The minimum reproduction and effective flowering diameters were 32 and 37 cm, respectively. Fruit maturation took place during 7 mo. With a minimum logging diameter of 90 cm, the recovery rate computed over a 30‐yr period was > 100 percent. Selective logging harvested only 12.1 percent of the total number of seed trees and had little influence on the species' biological parameters. Securing sufficient regeneration as a post‐logging action is probably the most important consideration for achieving long‐term sustainability. 相似文献
12.
We compared bird diversity and frequency in selection logged and unlogged forest to determine the effects of recent selection logging on avian biodiversity in a subtropical, moist evergreen forest. We used a combination of mist netting and fixed-radius point counts to assess bird communities in February and March 1993 in northwestern Belize. Vegetation structure and composition was similar in logged and unlogged forest. The 66 most common species occurred with statistically similar frequency in logged and unlogged forest although 13 species were two times more frequent in intact forest. Numbers of total bird species were similar between logging gaps and the logged forest matrix, and between the logged forest matrix and unlogged forests. A comparison of numbers of species in 26 guilds based on migration strategy, diet, foraging substrate, and height strata also showed them to be similar regardless of logging history. Our results differed from previous studies that reported lower bird species richness and abundance of individual species in logged tropical forests than in unlogged forest. The differences might be explained by the lower logging intensity and/or greater levels of natural disturbance in our study area compared to previous studies. 相似文献
13.
14.
Burning and logging differentially affect endemic vs. widely distributed butterfly species in Borneo
We assess the differential impact of logging and ENSO (El Niño Southern Oscillation)-induced disturbance on the relative butterfly abundance and species richness of range-restricted and widespread species within the island of Borneo. Relative abundance and species richness were assessed using rarefaction and species accumulation curves in unburned isolates surrounded by burned forest, the burned forest itself, and continuous forest unaffected by ENSO-induced disturbance in addition to logged and unlogged landscapes in unburned forest. The relative abundance of endemics was significantly higher in unlogged forest than logged forest and significantly higher in unburned forest than burned forest. Rarefied species richness of range categories was similar (Bornean endemics) or higher (other categories) in selectively logged than unlogged forest. In contrast, rarefied species richness of range-restricted species was highest in continuous forest, intermediate in unburned isolates, and lowest in burned forest. Only two individuals of a single Bornean endemic species were found in all the burned forest. Although species richness was higher in all range categories in continuous forest than in unburned isolates and in burned forest, the difference was most pronounced for range-restricted species. Logging and ENSO-induced fires thus have contrasting effects on range-restricted species. While both increase the relative abundance of widely distributed species at the expense of range-restricted species, only ENSO-induced disturbance lowers the rarefied number of restricted range species. Our research highlights the threat that severe ENSO events pose to geographically restricted classes of biodiversity. 相似文献
15.
We studied the effects of logging history, topography, and potential insolation on the lower-elevation limit of existing spruce-fir
forest in Great Smoky Mountains National Park (GRSM). Dummy-variable regression, analysis of variance, and classification
trees were applied to environmental data within a geographic information system framework. The effect of logging history on
the lower limit of spruce-fir depended on aspect. On north-facing slopes (270°– 90°), the presence of spruce-fir was independent
of both logging history and potential insolation. On south-facing sites (90°–270°), the elevation of spruce-fir was significantly
higher (by 122 m) in areas that had been logged historically. Classification-tree models suggested an even greater logging
effect, indicating that both the lower limit and the upper dominance zone of spruce-fir forest are, on average, nearly 200 m
higher in historically logged landscapes. Presence of spruce-fir on south aspects was also significantly related to potential
insolation, but the strength of this effect was not dependent on logging history. Classification-tree models, developed separately
using data from logged sites versus unlogged sites, were used to estimate the current area of spruce-fir forest in the park
expected under the hypothetical scenario that no spruce-fir had been logged (38,675 ha) versus the alternate scenario that
it had hall been logged (11,727 ha). At present the area of spruce-fir forest in the park is 21,242 ha. We found greater prevalence
of spruce-fir on the Tennessee side of the divide on south aspects and historically logged sites, possibly due to greater
occurrence of westerly winds and associated cloud cover. 相似文献
16.
17.
Leaf litter decomposition rates in degraded and fragmented tropical rain forests of Borneo
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Previously extensive tracts of primary rain forest have been degraded by human activities, and we examined how the effects of forest disturbance arising from habitat fragmentation and commercial selective logging affected ecosystem functioning in these habitats by studying leaf litter decomposition rates in litter bags placed on the forest floor. The rain forests of Borneo are dominated by trees from the family Dipterocarpaceae, and we compared leaf litter decomposition rates of three dipterocarp species at eight forest fragment sites (area 3–3529 ha) that had different histories of disturbance pre‐fragmentation: four fragments had been selectively logged prior to fragmentation and four had been formed from previously undisturbed forest. We compared these logged and unlogged forest fragments with sites in continuous forest that had been selectively logged (two sites) and fully protected and undisturbed (two sites). After 120 d, undisturbed continuous forest sites had the fastest rates of decomposition (52% mass loss). Forest fragments formed from unlogged forest (32% mass loss) had faster decomposition rates than logged forest fragments (28% mass loss), but slower rates than continuous logged forest (39% mass loss). Leaves of a light‐demanding species (Parashorea malaanonan) decomposed faster than those of a shade‐tolerant species (Hopea nervosa), but decomposition of all three dipterocarp species that we studied responded similarly to logging and fragmentation effects. Reduced decomposition rates in logged and fragmented forest sites may affect nutrient cycling and thus have detrimental consequences for forest regeneration. Conservation management to improve forest quality should be a priority, particularly in logged forest fragments. 相似文献
18.
Cleary DF 《Oecologia》2003,135(2):313-321
The impact of disturbance on species diversity may be related to the spatial scales over which it occurs. Here I assess the impact of logging and ENSO (El Niño Southern Oscillation) -induced burning and forest isolation on the species richness (477 species out of more than 28,000 individuals) and community composition of butterflies and butterfly guilds using small (0.9 ha) plots nested within large (450 ha) landscapes. The landscapes were located in three habitat classes: (1) continuous, unburned forest; (2) unburned isolates surrounded by burned forest; and (3) burned forest. Plots with different logging histories were sampled within the two unburned habitat classes, allowing for independent assessment of the two disturbance factors (logging and burning). Disturbance within habitat classes (logging) had a very different impact on butterfly diversity than disturbance among habitat classes (due to ENSO-induced burning and isolation). Logging increased species richness, increased evenness, and lowered dominance. Among guilds based on larval food plants, the species richness of tree and herb specialists was higher in logged areas but their abundance was lower. Both generalist species richness and abundance was higher in logged areas. Among habitat classes, species richness was lower in burned forest and isolates than continuous forest but there was no overall difference in evenness or dominance. Among guilds, generalist species richness was significantly lower in burned forest and isolates than continuous forest. Generalist abundance was also very low in the isolates. There was no difference among disturbance classes in herb specialist species richness but abundance was significantly higher in the isolates and burned forest than in continuous forest. Tree specialist species richness was lower in burned forest than continuous forest but did not differ between continuous forest and isolates.The scale of assessment proved important in estimating the impact of disturbance on species richness. Within disturbance classes, the difference in species richness between primary and logged forest was more pronounced at the smaller spatial scale. Among disturbance classes, the difference in species richness between continuous forest and isolates or burned forest was more pronounced at the larger spatial scale. The lower levels of species richness in ENSO-affected areas and at the larger (landscape) spatial scale indicate that future severe ENSO events may prove one of the most serious threats to extant biodiversity. 相似文献
19.
Nicholas J. Berry Oliver L. Phillips Simon L. Lewis Jane K. Hill David P. Edwards Noel B. Tawatao Norhayati Ahmad David Magintan Chey V. Khen M. Maryati Robert C. Ong Keith C. Hamer 《Biodiversity and Conservation》2010,19(4):985-997
The carbon storage and conservation value of old-growth tropical forests is clear, but the value of logged forest is less certain. Here we analyse >100,000 observations of individuals from 11 taxonomic groups and >2,500 species, covering up to 19?years of post-logging regeneration, and quantify the impacts of logging on carbon storage and biodiversity within lowland dipterocarp forests of Sabah, Borneo. We estimate that forests lost ca. 53% of above-ground biomass as a result of logging but despite this high level of degradation, logged forest retained considerable conservation value: floral species richness was higher in logged forest than in primary forest and whilst faunal species richness was typically lower in logged forest, in most cases the difference between habitats was no greater than ca. 10%. Moreover, in most studies >90% of species recorded in primary forest were also present in logged forest, including species of conservation concern. During recovery, logged forest accumulated carbon at five times the rate of natural forest (1.4 and 0.28?Mg?C?ha?1?year?1, respectively). We conclude that allowing the continued regeneration of extensive areas of Borneo??s forest that have already been logged, and are at risk of conversion to other land uses, would provide a significant carbon store that is likely to increase over time. Protecting intact forest is critical for biodiversity conservation and climate change mitigation, but the contribution of logged forest to these twin goals should not be overlooked. 相似文献
20.
Micaela Medina Magali Prez Flores Juan Francisco Goya Paula Ines Campanello Martin Alcides Pinazo Luis Javier Ritter Marcelo Fabian Arturi 《Austral ecology》2020,45(2):229-239
Deforestation is a global process that has strongly affected the Atlantic Forest in South America, which has been recognised as a threatened biodiversity hotspot. An important proportion of deforested areas were converted to forest plantations. Araucaria angustifolia is a native tree to the Atlantic Forest, which has been largely exploited for wood production and is currently cultivated in commercial plantations. An important question is to what extent such native tree plantations can be managed to reduce biodiversity loss in a highly diverse and vulnerable forest region . We evaluated the effect of stand age, stand basal area, as a measure of stand density, and time since last logging on the density and richness of native tree regeneration in planted araucaria stands that were successively logged over 60 years, as well as the differences between successional groups in the response of plant density to stand variables. We also compared native tree species richness in planted araucaria stands to neighbouring native forest. Species richness was 71 in the planted stands (27 ha sampled) and 82 in native forest (18 ha sampled) which approximate the range of variation in species richness found in the native forests of the study area. The total abundance and species richness of native trees increased with stand age and time since last logging, but ecological groups differed in their response to such variables. Early secondary trees increased in abundance with stand age 3–8 times faster than climax or late secondary trees. Thus, the change in species composition is expected to continue for a long term. The difference in species richness between native forest and planted stands might be mainly explained by the difference in plant density. Therefore, species richness in plantations can contribute to local native tree diversity if practices that increase native tree density are implemented. 相似文献