中文摘要：

单物种–面积关系（ISAR）方法可判定单个物种在不同空间尺度下对邻域生物多样性的影响作用是促进、抑制或中性。尽管已有研究尝试分析了不同径级大小个体对邻域植物多样性的影响,但这方面仍缺乏较系统的研究,对不同径级植株在维持森林群落植物多样性方面的作用差异仍不清楚。本研究以河南宝天曼国家级自然保护区1ha落叶阔叶林固定样地为例,通过对全部树（包括大树和小树）分别对全部树/大树/小树,大树分别对全部树/大树/小树,小树分别对全部树/大树/小树9种类型的ISAR进行比较分析,拟验证如下假设：（1）大树相比小树来说对邻域植物多样性的影响更大,（2）同一物种或同一径级个体对邻域小树比对邻域大树的影响要强,（3）宝天曼落叶阔叶林木本植物中中性物种占主体。结果显示不同大小的树木个体对邻域植物多样性的影响作用也因空间尺度、邻域植物个体大小而有所差别：支持同一物种或同一径级个体对邻域小树比对邻域大树的影响要强的假设,没有检测到大树比小树对邻域植物多样性更大的影响作用;中性物种在所研究森林群落中1–10 m尺度上均占绝对优势,促进种的数量在全部树对全部树,全部树对小树,小树对全部树以及小树对小树情况下随着尺度的增加呈先升高后下降的趋势,抑制种在少数小尺度下被少量检测到。本研究结果有助于我们更好地认识和理解森林群落中物种作用及群落维持机制,但该结果还需在更大尺度样地以及其他类型的森林中进行检验。

英文摘要：

The individual species-area relationship （ISAR） can be used to estimate the effects of individual species （accumulator, repeller, or neutral） on neighboring biodiversity at different spatial scales. The effects of individual species with different sizes （diameter at breast height classes, DBH classes） on neighboring species diversity are still an unresolved question although several papers have addressed this question by using the ISAR. In this study, we compared ISARs of nine types （all to all, all to adult, all to young, adult to all, adult to adult, adult to young, young to all, young to adult and young to young）; ＂young to adult＂ represents that ISAR of young individuals of target species to adult individuals of neighboring species in a 1 ha decidu- ous broad-leaved forest in Baotianman National Nature Reserve, Henan Province. We tested the following hypotheses： （1） the adult individuals （DBH 〉 10 cm） of target species have greater influence on the biodi- versity of their neighbors than the young （DBH 〈 10 cm）; （2） the individuals of the same species or the same size class have greater influence on neighboring young tree diversity than adult tree diversity; （3） most species are neutral in the Baotianman deciduous broad-leaved forest. The results showed that the effects of tree species with different sizes on neighboring tree diversity are scale-based and also affected by the size of the neighbor tree. The results supported the hypothesis that individuals of the same species or the same size have greater influence on neighboring young tree diversity than on neighboring adult tree diversity; but did not support that the adult individuals of focal species have greater influence on neighboring tree diversity than young individuals. The results also indicated that most species are neutral at spatial scales of 1-10 m in the Baotianman forest; multiple accumulator or repeller species were detected at some scales. The results will contribute to our understanding of the ro