Spatial associations of tree species in a subtropical evergreen broad-leaved forest

Aims The spatial segregation hypothesis and the low-frequency hypothesis are two important proposed mechanisms that delay or prevent competitive exclusion in ecosystems. Because tree species interact with their neighbors, the importance of these potential processes can be investigated by analyzing the spatial structures of tree species.Methods The distribution of the adults of 27 common tree species in a fully mapped 5-ha subtropical forest plot in Baishanzu, eastern China, was analyzed to investigate the community-level intra- and interspecific spatial association patterns. We first tested for the overall spatial pattern in the 5- to 40-m neighborhoods and classified first-order bivariate associations with a diametric scheme based on Ripley's K and nearest-neighbor statistic (G -function). Then heterogeneous Poisson null models were used to distinguish second-order interactions from overall spatial associations (including first-order effects). Finally, we analyzed correlations between the existence of species interactions and some attributes of the species involved.Important findings Partial overlap and segregation increased with scale, whereas mixing decreased. Nearly 70% of the species pairs occurred less than expected at random, and only 3.4% of the species pairs were well mixed; 11.0% of all species pairs showed significant small-scale interactions, which was a greater frequency than expected by chance if species are abundant or prefer the same habitat, but less frequent than expected if species are highly aggregated. This suggests that both spatial segregation and low frequency of species facilitate species coexistence by reducing the opportunity that trees of two species encounter each other. The study also revealed that positive interactions were more prevalent than negative interactions in the forest, which indicates that positive interactions may have important effects on forest species assemblies.     

百山祖常绿阔叶林木本植物的生境相关性分析

中性理论和生态位理论在解释热带雨林中物种共存机制上发挥了重要作用.本文通过Torus-translation榆测方法对百山祖常绿阔叶林5 ha样地中DBH≥1 cm、个体数大于5的89种木本植物与4个根据地形和物种组成划分的小生境进行了关联性分析.同时按植物的胸径径级大小将其分为幼树期、生长期、成熟期3个生长阶段,并分别分析了植物在这3个生长阶段与生境的关联性.结果表明:89个木本植物中,没有表现出显著的生境相关件的物种多是稀有种或是个体数较少的物种,而大部分的常见种表现出与生境的显著相关性;通过对每个物种不同生长阶段的生境相关性比较,发现多数物种的生境相关性会发生改变,其中只有麂角杜鹃(Rhododendron latoucheae)、褐叶青冈(Cyclobalanopsis stewardiana)和厚叶红淡比(Cleyera pachyphylla)在生长的3个生长阶段没有发生改变.这表明,生境异质性对亚热带常绿阔叶林中木本植物的生物多样性的维持起着重要作用,同时对不同生长时期的物种与生境相关性的分析结果表明,大部分物种与生境的相关性会随着生长阶段的变化而发生变化.     

亚热带常绿阔叶林林窗物种丰富度的影响因素

林窗是森林群落物种多样性维持中十分重要的结构,但其本身物种多样性的维持机制尚不清楚,可能与相邻群落的物种丰富度、林窗面积以及土壤和地形因子等有关。本文选取浙江天童20 ha森林动态监测样地内的84个冠林窗作为研究对象,分析了林窗内部以及不同距离邻域内的物种组成,选取包含大部分林窗内物种(≥75%),并且对林窗内物种丰富度影响最大的邻域作为相关邻域(林窗周围成熟植株通过种子传播影响林窗物种丰富度,把距离冠林窗边缘5 m范围内的区域作为种源效应邻域;由于距离林窗较近,物种组成与林窗形成时仍存活个体的物种组成相似,故把距离冠林窗边缘4 m范围内的区域作为距离效应邻域),然后计算种源效应邻域内成熟植株的物种丰富度、距离效应邻域内所有植株的物种丰富度、冠林窗的面积、地形因子(海拔、坡度、坡向、凸度)和土壤因子(p H值、全氮、全碳、全磷),最后对11个潜在的影响因素进行随机组合,构建广义线性回归模型,筛选最优模型(AICc最小)进行分析。结果显示:种源效应邻域内成熟植株的物种丰富度和冠林窗面积显著影响林窗内物种丰富度,其他因素并未对冠林窗内物种丰富度产生显著影响。上述结果说明,冠林窗面积的大小以及外部种源的丰富程度是决定冠林窗内物种丰富度的主要因素,其他因素可能只产生间接影响。     

中国亚热带地区阔叶林植物的谱系地理历史

中国亚热带地区因丰富的植物物种多样性备受生物地理学研究关注,丰富的多样性与中新世以来的地质气候变化密切相关。谱系地理学已成为探讨植物分布模式和遗传格局受地质气候变化影响的主要手段。总结了该地区阔叶林植物对中新世以来地质气候变化的响应模式和种群分化的历史成因。在中新世和上新世时,由于全球变冷、青藏高原抬升和亚洲内陆干旱,阔叶林植物被迫向南退缩,形成不同的谱系。同时,亚洲季风的增强为遗传多样性的增加提供了良好的环境。在更新世冰期和间冰期时,大部分落叶阔叶林和常绿阔叶林植物在多个避难所间存在长期隔离,不同的避难所种群各自经历局部地区的收缩和扩张。长期的隔离使不同谱系间进一步分化,形成高水平的遗传多样性和遗传分化。少部分植物在冰期时向南退缩,并在间冰期时明显向北扩张。最后,就分化时间的准确估计和探究遗传格局背后的机制两方面展望了未来的研究趋势。     

Density dependence is prevalent in a heterogeneous subtropical forest

Although negative conspecific density dependence among neighbours is widely studied, the general prevalence of the effects is still poorly understood due to a lack of studies from zonal forests other than the tropics. In addition, the detection of density dependence may be confounded by the influence of habitat heterogeneity. Here we examined the spatial distributions of 47 common tree species (diameter at breast height≥1  cm) using the pair-correlation function g(r) in a fully mapped 24-ha subtropical forest in China. We first investigated whether habitat heterogeneity influenced tree distributions, and then examined the conspecific tree patterns and density dependence after removing the effects of habitat heterogeneity. We found that the forest plot exhibited strong large-scale heterogeneity in the distribution of both large adult trees of different growth forms and individual species. After the habitat heterogeneity was accounted for, 39 of the 47 species (83.0%) were found to exhibit density dependence predominantly at close distances among neighbors. Our findings highlight density dependence as a prevalent mechanism for regulating the population spatial structure of most tree species in the species-rich subtropical forest studied here. Furthermore, the occurrence of density dependence is closely associated with species abundance and the strength of conspecific aggregation at local scales. Abundant species with high strength of conspecific aggregation tend to show density dependence.     

Species associations in a heterogeneous Sri Lankan dipterocarp forest

We used point pattern analysis to examine the spatial distribution of 46 common tree species (diameter at breast height >10 cm) in a fully mapped 500x500-m tropical forest plot in Sinharaja, Sri Lanka. We aimed to disentangle the effect of species interactions (second-order effects) and environment (first-order effects) on the species' spatial distributions. To characterize first-order associations (segregation, overlap), we developed a classification scheme based on Ripley's K and nearest-neighbor statistics. We subsequently used heterogeneous Poisson null models, accounting for possible environmental heterogeneity, to reveal significant uni- and bivariate second-order interactions (regularity, aggregation and repulsion, attraction). First-order effects were strong; overall, 53% of all species pairs occupied largely disjoint areas (segregation), 40% showed partial overlap, and 6% overlapped. Only 5% of all species pairs showed significant second-order effects, but about half of the species showed significant intraspecific effects. Significant plant-plant interactions occurred mostly within 2-4 m and disappeared within 15-20 m of the focal plant. While lack of significant species interactions suggests support for the unified neutral theory, species' observed spatial segregation does not support the assumptions of the neutral theory. The strong observed tendency of species to segregate may have supplementary effects on other processes promoting species coexistence.     

鼎湖山南亚热带常绿阔叶林20公顷样地幼苗的分布

为了解鼎湖山常绿阔叶林树木幼苗的组成、分布及高度结构,在鼎湖山20 ha动态监测样地(简称DHS)内布置了149个种子雨收集器,并在周围设置了幼苗小样方.2008年31月完成了幼苗调查,共调查到2,632株.采用多元线性回归方法分析了9个树种幼苗多度与6个变鼍之间的关系.这6个变量包括种子雨收集器10 m内DBH≥1 cm同种个体的个体数、胸高断面积之和,以及地形的凹凸度、坡度、坡向和海拔.结果表明影响幼苗多度的因素随树种不同而不同.其中3个树种的幼苗多度只与地形变量有关,4个树种幼陌多度同时受到地形和同种个体多度的影响,1个树种的幼苗多度只与同种个体有关,1个树种幼苗多度与所有变量的关系都不显著.除谷木(Memecylon ligustrifolium)外,10 m范围内同种个体的多度和胸高断面积的偏回归系数一旦显著皆为正值,即幼苗多度随同种个体数或同种胸高断面积增大而增大.本研究为扩散限制和生态位理论提供了间接的证据.     

亚热带常绿阔叶林群落物种多度分布格局对取样尺度的响应

为揭示物种多度格局随尺度的变化规律,探讨多度格局形成的机理及生态学过程,作者以古田山亚热带常绿阔叶林24 ha固定监测样地为背景.采用断棍模型(broken stick model)、对数正态模型(Iognormal distribution model)、生态位优先占领模型(preemption model)、Zipf模型(Zipf model)、Zipf-Mandelbrot模型(Zipf-Mandelbrot model)及中性理论模型(neutral model),对不同尺度下的物种多度分布格局进行拟合,并采用AIC检验和卡方检验选择最优拟合模型.结果表明,不同尺度上适合的物种一多度曲线模型不同;在取样边长为10 m和20 m时,除中性模型外的5个模型均不能被拒绝,它们均适合小尺度下的格局,这表明存小的尺度上生态位过程对物种一多度曲线的格局贡献较大;在取样边长为40 m时,最适合的模型为对数正态模型;取样边长为60 m和80 m时,Zipf-Mandelbrot模型为最优拟合模型;在取样边长为100 m时,尽管Zipf-Mandelbrot模型有最小的AIC值,但卡方检验拒绝了除中性模型外的5个模型;中性理论模型除了边长为10 m和20 m尺度以外,在其他尺度上均比前面5种模型的预测效果更好.因此在研究物种多度分布规律时必须注意空间尺度的影响.研究结果表明随着尺度的增加,中性过程成为决定物种一多度曲线格局的主要生态过程.     

Nitrogen additions reduce rhizospheric and heterotrophic respiration in a subtropical evergreen broad-leaved forest

Plant and Soil - Increasing global atmospheric nitrogen (N) deposition has a considerable impact on soil respiration. Due to different carbon dioxide (CO2) resources of different components of soil...     

Density dependence is not very prevalent in a heterogeneous subtropical forest

There is a growing body of evidence demonstrating that tree survival is influenced by negative density‐dependence, but it is still controversial how the effect may vary with life‐stage, and to what extent it plays a role in regulating tree survival in heterogeneous subtropical forests. In this study, we investigated density‐dependent effects on tree survival of six tree species in a 5‐ha subtropical forest in eastern China. The roughly 45 000 individuals in the forest were fully censused in 2003 and 2008. For each of these species, we used an inhomogeneous pair‐correlation function to quantify the change in spatial distribution for different size classes, and a case‐control design to study seedling–adult associations in 2003. Autologistic regression was used to determine the influence of neighborhood factors on individual survival from 2003 to 2008. We found that seedlings of five species were repulsed by distance to nearest conspecific adults in terms of their survival, consistent with predictions of the Janzen–Connell mechanism. By contrast, only the least shade‐tolerant Schima superba had a negative relationship with individual survival and conspecific distance‐weighted basal area. This suggests that the Janzen–Connell effect is only prevalent at the early seedling stage or seed‐to‐seedling phase. The strength of clustering significantly declined at sapling–pole and pole–adult transitions for Sycopsis sinensis and at seedling–sapling transition for Cleyera pachyphylla. Correlations between individual survival and conspecific abundance for these species were consistent with trends in the strength of clustering. These results suggest that density dependence plays a limited role in individual survival and species spatial structure beyond the early seedling stage (i.e. after true leaves growing) in this forest. In addition, this study indicates that including individuals from early life‐stages and factoring out potential confounding factors such as habitat preference are important in studies that seek evidence for density dependence in forest trees.     

南亚热带阔叶林展叶物候及其种内种间差异探讨

植物的展叶物候与植物的生长和生存密切相关,但未见有定性的研究植物展叶物候的种间和种内差异与验证亚热带常绿阔叶林植物展叶物候系统发育关系的报道。为了更好地理解南亚热带常绿阔叶林物种共存机制和预测不同物种对气候变化的响应,该研究于2013年1月至2014年12月期间,在中国科学院华南植物园鼎湖山自然保护区内对44个树种的展叶物候进行了连续观测,利用变异系数定性分析了气候因子、系统发育关系对展叶始期及其种内和种间差异和展叶期的影响。结果表明:鼎湖山自然保护区植物展叶始期主要集中在3-5月,植物展叶物候受气候因子影响不显著;不同物种的展叶物候种内变异差别较大,其中种内差异最大的是红皮紫棱(Craibiodendron kwangtungense)(变异系数为0.74),最小的是广东润楠(Machilus kwangtungensis)(变异系数为0.09);基于APGⅢ物种数据库构建谱系树,发现植物间的系统发育关系对展叶物候无显著影响,即亲缘关系近的物种,展叶期并不相似。该研究结果对于理解生态系统过程,如碳循环、物质能量流动,以及展叶物候对气候变化的适应性具有重要意义。     

鼎湖山南亚热带常绿阔叶林荷木种群动态变化

荷木(Schima superba)是鼎湖山南亚热带常绿阔叶林群落中的优势种,为了解南亚热带常绿阔叶林的群落构建机制,该研究分析了鼎湖山南亚热带常绿阔叶林20 hm2样地中荷木种群在2005—2017年间的动态变化,并从径级和生境两个方面分析了其死亡率的分布特征。结果表明:(1)荷木种群个体数量从2005—2017年呈现出减少的态势。(2)在径级方面,荷木的死亡率和相对生长率的变化在不同径级区间呈现出不同的变化规律。径级在1～10 cm范围的荷木相对生长率大并迅速下降,死亡率上升且维持在较高水平;径级在10～50 cm范围的荷木随着径级增大,相对生长率减缓,然后下降,而死亡率不断下降;在50 cm以上的径级范围内,荷木相对生长率小、死亡率大。(3)不同生境中,2010年各个生境死亡率相差不大,2015年高海拔生境(高坡、山脊、高谷)死亡率大于低海拔生境(低坡、低谷),2017年则为低海拔生境大于高海拔生境。(4)荷木的死亡率与土壤中酸碱度呈正相关关系,而与土壤有机质、总氮、总磷、有效钾、有效氮含量呈负相关关系。     

氮添加对亚热带常绿阔叶林土壤溶液化学特性的影响

土壤溶液被称作"土壤的血液",是土壤中各种生物化学反应的中介物质,在外界环境发生变化时,土壤溶液化学成分能在其他土壤指标尚无变化之前对环境变化做出迅速响应。为了探索持续增加的大气氮（N）沉降对森林生态系统的影响,以华西雨屏区亚热带常绿阔叶林为对象,设置对照（CK,0 g m^-2 a^-1）,低N（LN,5 g m^-2 a^-1）,高N（HN,15 g m^-2 a^-1）三种N处理,通过人工施加硝酸铵（2017年9月起改施硝酸钠及氯化铵）的方法模拟N沉降增加情景,N处理42个月后,使用负压土壤溶液采样器定位收集A层（37-45 cm）及B层（52-60 cm）土壤溶液,并进行分析（每月1次,为期1 a）。结果表明：对照处理中A、B两层土壤溶液NO₃^-浓度达（3.94±0.77）mg/L、（4.27±1.13）mg/L,N添加显著提高两层土壤溶液NO₃^-浓度和B层NH₄⁺浓度;N添加显著降低土壤溶液pH,且显著增加Al³⁺浓度,Ca²⁺和Mg²⁺含量有增加趋势,但影响不显著;N处理使A层土壤溶液可溶性有机碳（DOC）浓度显著降低,对两层土壤溶液芳香化指数（AI）无显著影响;两层土壤溶液电导率（EC）及氧化还原电位（Eh）显著增加;此外,两层土壤溶液中许多化学成分均呈现极显著相关,特别是NO₃^-与EC相关系数达到了0.855。本研究中,对照处理极高的NO₃^-含量以及B层土壤溶液硝酸盐浓度高于A层,表明该亚热带常绿阔叶林N的有效性超过植物和微生物的总营养需求而发生淋溶,该生态系统已达到氮饱和状态,此外N添加会显著促进土壤酸化和铝离子活化,表层土壤溶液DOC的降低一定程度反映了凋落物分解受N添加的抑制作用,显著升高的氧化还原电位可能导致土壤中某些金属元素的迁移率降低。     

基于多元回归树的常绿阔叶林群丛数量分类——以古田山24公顷森林样地为例

常绿阔叶林植被分类一直是植被生态学研究中的难题,尤其是基本单位——群丛的分类。该文以地形因子和物种组成数据为变量的多元回归树方法,将浙江古田山24hm2森林监测样地的森林群落分为3个群丛。所得群丛既反映了群落在时间和空间上的相对间断分布,也符合植被分类基本单位的特点,为常绿阔叶林的群丛分类提供了新思路。并首次引入了指示值算法,解决了以往指示种无法量化的难题。最终以优势层优势种为主、下木层指示种为辅的命名原则,将3个群丛命名为:1)石斑木(Raphiolepis indica)+柳叶蜡梅(Chimonanthus salicifolius)-格药柃(Eurya muricata)+赤楠(Syzygium buxifolium)-木荷(Schima superba)+甜槠(Castanopsis eyrei)群丛;2)映山红(Rhododendron simsii)+满山红(Rhododendron mariesii)-短柄枹(Quercus serrata var.brevipetiolata)+灰白蜡瓣花(Corylopsis glandulifera var.hypoglauca)-马尾松(Pinus massoniana)+甜槠群丛;3)短尾越桔(Vaccinium carlesii)+毛花连蕊茶(Camellia fraterna)-杨梅叶蚊母树(Distylium myricoides)+浙江新木姜子(Neolitsea aurata)-木荷+甜槠群丛。     

Species‐habitat associations change in a subtropical forest of China

Question: Do tree and shrub species in an evergreen broadleaf forest show similar habitat associations across different life stages? Location: A 24‐ha evergreen broadleaf forest plot in a heterogeneous landscape in Gutianshan National Nature Reserve, Zhejiang Province, Eastern China. Methods: Species having positive associations with four habitat types (low valley, low ridge, upper valley, and upper ridge) at three life stages (sapling, juvenile, and mature stages) were compared for 60 tree and shrub species using torus‐translation tests. Results: A total of 117 significant positive associations with the four habitats were observed at the three life stages (43, 41, and 33 at the sapling, juvenile, and mature stages, respectively). For the 52 species significantly associated with habitats, only 16 were associated with the same habitat across all three stages. The majority of associated species at the juvenile stage (34 out of 40) were associated with the same habitat at their sapling stage, whereas half of species at the mature stage had consistent associations with the same habitat at their sapling stage. More species were associated with the upper ridge at the sapling and juvenile stages compared to the mature stage. Conversely, more species were associated with the low valley at the mature stage compared to the sapling and juvenile stages. Conclusions: Our results indicate that species ecological habitat associations can differ between developmental stages beyond 1 cm DBH, as most species habitat preferences were consistent from the sapling stage to the juvenile stage but changed at the mature stage.     

常绿阔叶林林冠环境对栲幼苗建成的影响

植物幼苗建成阶段是决定种群自然更新的关键生活史阶段。研究林冠环境对常绿阔叶林优势种幼苗建成阶段的影响对该类森林的恢复和管理具有重要意义。2014-2016年, 该研究在重庆市缙云山国家级自然保护区的常绿阔叶林的不同林冠环境(大林窗: >150 m ², 中林窗: 100-150 m ², 小林窗: 50-100 m ², 对照: 林下)下进行栲(Castanopsis fargesii)种子野外播种实验, 并对栲幼苗命运和生长情况进行了3年的持续监测。结果表明: (1)栲幼苗出土时间从7月持续到12月, 出苗时间较长, 大林窗对幼苗出土具有延迟作用; (2)栲种子野外平均萌发率为(62.8 ± 2.0)%, 第3个生长季(2016年)末幼苗平均存活率为(65.1 ± 2.2)%, 枯萎是栲幼苗死亡的主要原因; (3)林冠环境对栲种子萌发率及第1个生长季(2014年)末的幼苗存活率无显著影响, 对第2个(2015年)和第3个生长季末的幼苗存活率具有显著影响; (4)林冠环境在第1个生长季对幼苗生长无明显影响, 但在第2个和第3个生长季具有显著影响, 大、中林窗中幼苗总生物量、株高、基径、根长和叶片数显著高于林下, 比叶面积显著低于林下; (5) 3个生长季内, 4类林冠条件下栲幼苗的叶质量比和茎质量比升高, 根质量比和根冠比降低, 并且从第2个生长季开始大林窗中栲幼苗的叶质量比显著高于林下, 根质量比和根冠比显著低于林下。栲幼苗早期的存活和生长依赖种子储存的能量, 受林冠条件影响较弱, 后期则依赖光合作用, 受林冠条件影响较强, 从整个幼苗建成过程看, 大、中林窗更有利于栲幼苗定居。     

亚热带常绿阔叶林种子性状对木本植物聚集格局的影响

种子的特征如种子的重量、大小和传播方式直接影响物种的扩散能力,从而影响物种空间分布的聚集强度。作者以古田山亚热带常绿阔叶林24 ha样地中89种木本植物为研究对象,分析了它们的种子大小、重量和扩散方式与物种聚集强度的关系。结果表明:在20 m范围内,样地内90%的物种为聚集分布,聚集强度随着尺度的增大而减弱,稀有种的聚集强度大于常见种。用系统发育独立比较(phylogenetically independent contrasts)方法排除了系统发育影响后,物种的多度与聚集强度呈显著相关(在15 m尺度,R2=0.32,P0.001);种子大小与物种聚集强度的相关性较弱(R2=0.05,P0.05),而种子重量与物种聚集强度之间的相关性相对较强(R2=0.14,P0.05)。种子的传播方式显著地影响物种的聚集强度:无助力扩散物种的聚集强度显著地高于有助力扩散物种的聚集强度(F1,87=4.439,P=0.038),即长距离扩散导致物种的聚集强度减弱。可见,在亚热带森林中,种子性状通过影响种子扩散进而引起物种聚集强度的变化,是影响物种空间分布格局的重要生态因素。     

西双版纳热带雨林和哀牢山亚热带常绿阔叶林雾特征研究

以西双版纳热带雨林和哀牢山亚热带常绿阔叶林为研究对象,利用PWS100天气现象仪获取两种森林类型的能见度数据。基于2014年西双版纳热带雨林和哀牢山亚热带常绿阔叶林的能见度数据,对两种森林类型雾的特征进行定量研究。研究结果表明:(1)西双版纳热带雨林全年雾日数为196 d,占全年的53.7%,哀牢山亚热带常绿阔叶林全年雾日数为100 d,占全年的27.4%,热带雨林全年雾日数几乎为亚热带常绿阔叶林雾日数的两倍;(2)热带雨林雨季和干季各占28.06%和71.94%,而亚热带常绿阔叶林雨季和干季各占72%和28%;(3)热带雨林一日内雾持续的最长时间为10.5 h,而亚热带常绿阔叶林雾生成和消散时间不定,一日内雾最长持续时间可达24 h,但雾发生的频率低于西双版纳热带雨林。两种森林类型全年雾日特征有明显的差异性,通过定量评价地处过渡带上的两种多雾森林生态系统雾特征,可为未来气候变化对不同森林生态系统碳水交换影响提供数据支撑。     

黄山亚热带常绿阔叶林的群落特征

黄山是我国东部高山之一, 处于亚热带季风气候区, 属南北植物区系交替的过渡带, 是第四纪冰期动植物的避难所。其地带性植被为常绿阔叶林, 植被垂直分布明显, 是中国生物多样性保护优先区域, 也是世界文化与自然遗产地以及享誉全球的风景名胜区。2014年, 我们在黄山建立了10.24 ha的森林动态监测样地, 并完成了首次调查。本文从物种组成、区系特征、径级结构和空间分布格局等方面分析了样地中植物的群落特征。结果表明: 样地内有维管植物59科129属191种, 其中乔木层内胸径≥ 1 cm的木本植物46科97属153种; 热带性质的科、属分别占总科、属数的65.79%和45.36%, 温带性质的科、属分别占34.21%和51.55%。样地内珍稀濒危物种较多, 其中国家II级重点保护野生植物6种、《中国生物多样性红色名录——高等植物卷》中的近危物种7种、《濒危野生动植物种国际贸易公约》(CITES)附录II物种1种以及64种中国特有种, 这些物种具有较高的保护和研究价值。当取样面积小于2,150 m²时, 物种数随着面积的增加而急剧增加; 其后增加速率明显降低; 但大于57,950 m²时, 增加速率又略变大。稀有种69种, 占总树种数的45.10%。壳斗科和杜鹃花科的重要值占一半以上。建群种甜槠(Castanopsis eyrei)的重要值达26.25%, 其次分别为细齿叶柃(Eurya nitida) (7.63%)、马银花(Rhododendron ovatum) (7.60%)、马尾松(Pinus massoniana) (6.29%)和檵木(Loropetalum chinense) (4.83%)。样地平均胸径为4.10 cm, 小径木的数量占较大优势。乔木层可分为两个亚层, 甜槠在两个亚层的个体数量均最多, 马尾松数量也比较多。甜槠、细齿叶柃、马银花、马尾松等均呈较显著的聚集分布。