蓝锭果忍冬干燥果实的营养成分及其评价

蓝锭果忍冬（Lonicera caerulea L．var．edulis Turcz．ex Herd．）主要分布于中国黑龙江、吉林、辽宁、内蒙古、河北、山西、宁夏、甘肃南部、青海、四川北部及云南西北部。其果实味酸甜,可供食用、酿酒和药用,是中国东北地区重要的野果资源。对蓝锭果忍冬鲜果原汁和发酵后调制的果酒营养成分已有相关的研究报道,但有关其干燥果实的营养成分尚未进行过研究和分析。     

Relationship between the Al resistance of grasses and their adaptation to an infertile habitat

BACKGROUND AND AIMS: Original data on Al resistance, relative growth rate and leaf traits of five European grasses as well as literature data on Al resistance, habitat preference and traits of grasses were considered to determine whether (a) Al resistance is correlated to a growth conservative strategy and (b) species occurrence could be useful to assess Al toxicity in meadows on acid soils. METHODS: The Al resistance of 15 species was represented by the Al activity in nutrient solution that resulted in a 50 % decrease in root length, [Al(3+)](50), or, for published values, in root or plant biomass. The correlations between Al resistance and acidity or nitrogen indices and the correlation between Al resistance and selected traits (relative growth rate, leaf dry matter content, specific leaf area and leaf thickness) were calculated. Principal component analysis was used for the characterization of the relationships between Al resistance and measured traits. KEY RESULTS: The [Al(3+)](50) values of the resistant species Molinia caerulea and Sieglingia decumbens were 13 and 26 microm [Al(3+)](50), respectively. The known Al resistance of 15 species that were mainly of the intermediate strategy competitor-stress tolerator-ruderal (C-S-R) type and of the S type was correlated with Ellenberg's nitrogen and acidity indices. For the whole set of species, the correlation between Al resistance and traits was not significant. CONCLUSION: The Al resistance of the C-S-R species was variable and independent of their traits. S-type species, adapted to acid soils and with traits of conservative strategy, displayed Al resistance. The large difference in Al resistance between grasses may help assess Al soil toxicity by using the abundance of grasses.     

Long‐term influence of sod cutting depth on the restoration of degraded wet heaths

Temperate heaths have an unfavorable conservation status in most European biogeographical regions. Increasing nitrogen levels promote competitive grass species such as Molinia caerulea, which is a main threat to heathland conservation in Europe. This article investigates the long‐term influence of sod cutting and the resulting changes in soil properties on the heath composition, integrity, and structure. In 15 nature reserves across the northern half of Belgium, we used (1) a large number of plots (203); (2) a broad range of sod cut depths (2–40 cm), and (3) a temporal dimension that describes how long the effects of sod cutting persist (census up to 19 years after sod cutting). Multivariate analyses were used in order to explore the influence of sod cut depth and time after sod cutting on the soil and vegetation properties. There was a positive relationship between sod cut depth and soil pH and water level, and a negative relationship with Al³⁺, NH₄⁺, and total organic matter (TOM). However, only a limited number of typical (target) species appeared after sod cutting, and then only weakly. Most of the time they remained a minor component of the restored vegetation. Moreover, M. caerulea reappeared and its cover significantly increased during the years following sod cutting. Although we were able to show that sod cut depth has a differential effect on soil properties and vegetation recovery, it also appeared that sod cutting does not restore wet heaths in the long term when applied in regions with high nitrogen deposition.     

Biological and ecological aspects of Chinese wax scale, Ceroplastes sinensis Del Guercio (Hemiptera: Coccidae): a two-year study from Central Greece

Abstract Biological and ecological aspects of the scale Ceroplastes sinensis are investigated on citrus in central Greece through regular samplings during 1999−2001 on Citrus sinensis (Sapindales: Rutaceae) in Attiki County. The scale was univoltine. Overwintering stages were the third-instar nymph and the adult female. From the end of May until the end of June the population comprised preovipositing females. Oviposition occurred from mid-June until mid-July and hatching took place during July. First- and second-instar nymphs were recorded from the end of July until the end of August, and from mid-August until the end of September, respectively. Third-instar nymphs appeared at the end of August and were present until the beginning of September. Some of the population of third-instar nymphs reached the adult stage during October and November, whilst the remainder completed development in the following April. Small numbers of male nymphs were recorded during October and November. The mean fecundity of adult females was 3260 ± 770 eggs per female. The most abundant natural enemy of C. sinensis was Scutellista caerulea (Fonscolombe) (Hymenoptera: Pteromalidae), whose eggs, larvae and pupae were found in up to 42% of the total live population of the scale. Two predators, Chilocorus bipustulatus (L.) and Exochomus quadripustulatus (L.) (Coleoptera: Coccinellidae), were also observed.     

A field assessment of the success of moorland restoration in the rehabilitation of whole plant assemblages

Question: How successful is restoration that is focused on a single dominant plant at enabling the reassembly of the whole vegetation assemblage and what factors affect the relative success of such restoration? Location: Moorlands in England and Scotland, UK. Methods: Vegetation composition was sampled in grassdominated (degraded), restored and long established Calluna vulgaris‐dominated (target) areas within eight moorland restoration sites. Additional soil and biogeographic data were collected. Data were analysed by Canonical Correspondence Analysis, which allowed the impact of moorland management to be examined. Results: All sites showed good restoration success when the dominant managed species (Calluna vulgaris, Molinia caerulea and Nardus stricta) were considered. Restoration success of the remainder of the plant assemblage, disregarding these dominant species, was lower with restored samples at some sites differing little from their respective degraded samples. Moors restored solely by grazing exclusion were more similar to their respective targets than were those restored by more intensive mechanical means. The most important factors in explaining vegetation assemblages were management status (i.e. whether samples represented degraded, restored or target parts of the moor) and latitude. Conclusions: The project demonstrates that, where possible, restoration should be attempted by grazing exclusion alone. Furthermore the importance of applying local restoration targets and of monitoring the whole plant assemblages when assessing the success of moorland restoration is highlighted.     

用非固定的荧光探针方法观察紫萼花粉管肌动蛋白纤丝的形式

用非固定的、二甲基亚砜作为渗透剂的、异硫氰四甲基罗丹明标记的鬼笔环肽染色方法,观察了紫萼(Hosta caerulea Tratt.)未萌发的花粉粒及不同生长时期的花粉管中的肌动蛋白纤丝的形式。显示未萌发的花粉粒中具有结晶状的梭状体,为肌动蛋白的一种贮藏形式。花粉萌发时,这种梭状体转移到短的花粉管中,逐渐松解、分支和形成肌动蛋白纤丝交错的网络。在花粉管迅速生长和达到一定长度时,肌动蛋白纤丝形成以与花粉管长轴平行的细丝占优势的网络系统,这是在大多数情况中紫萼花粉管典型的肌动蛋白纤丝的形式。在某些条件下,在花粉管接近顶端的前部,肌动蛋白纤丝可集合成长的粗束,这种粗束也常有分支和并合。肌动强白纤丝一直分布到花粉管的末端。讨论了研究肌动蛋白纤丝的非固定方法的重要性和进一步研究花粉管肌动蛋白纤丝值得注意的问题。     

Effects of competition on an endangered limpet Patella ferruginea (Gastropoda: Patellidae): Implications for conservation

Spatial and trophic competitive interactions were analysed for the seldom-studied limpet Patella ferruginea (which is considered as an “extinction risk”). Spatial patterns of distribution of P. ferruginea were studied using quadrats of 1 × 1 m² at several transects along the coastline, whereas trophic interactions were studied through manipulations of densities of P. ferruginea and Patella caerulea in experimental plots located at the mid-shore. Physical parameters were measured inside each plot to determine the microenvironmental differences between fenced and unfenced plots. Fenced plots of 50 × 50 cm² were used with six different treatments. Mortality was recorded every 15 days and length was measured monthly during the 3.5 months of the experiment. At the beginning and end of the experiment, lengths and weights of limpets were recorded and chlorophyll concentration was measured by spectrophotometric analysis of rock surface. Both species showed increased mortality and reduced size and weight in treatments with greater densities. High intraspecific competition was detected in P. caerulea compared with P. ferruginea whereas asymmetrical interspecific competition was observed. The results suggest that P. caerulea is the superior competitor, possibly due to differences in radular morphology and mobility between the two species. Microalgal food assessment showed that it is probably a limiting resource, especially for P. caerulea, although this species has a lower biomass than P. ferruginea. The high intraspecific competition observed in P. caerulea could be responsible for the coexistence of both species. The present study may be useful in helping to conserve P. ferruginea, which is presently under serious threat of extinction, because the results show that experimental fences are a viable means of concentrating breeding individuals.     

Influence of management on the seed production and seed bank of calcareous fen species

Abstract. The dynamics of the seed production and seed bank of two dominant perennial species of calcareous fens were investigated in response to different mowing frequency, fallow or pasture. The production of fertile shoots responded strongly to management practices. On sites where mowing alternated with fallow, autumn mowing led to an increase of fertile shoot density in Schoenus ferrugineus and a decrease in Molinia caerulea in the subsequent season. Repeated annual mowing after long-term fallow raised the density in Schoenus and inhibited initiation of flowering shoots in Molinia. Seed set and viability were influenced mainly by climatic or other factors. Variation of seed production between sites and in consecutive years at the same site could thus be large. The relationship between total seed production and seed bank was weak, but it improved when germination rates were included in the calculation. As the seed bank was generally smaller than the viable seed production, low survival and a high turnover of seeds in the upper soil layers is assumed for both species. Implications for recruitment strategies are discussed.