How topography and neighbor shape the fate of trees in subtropical forest restoration:Environmental filtering and resource competition drive natural regeneration

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外文摘要：The structure of plant communities at local scales depends on both the spatial heterogeneity of abiotic envi-ronmental factors and the biotic interactions within the community.However,although environmental filtering due to microtopographic heterogeneity and resource competition among plants caused by spatial variation in tree density and size are considered to be very important in explaining the mechanisms of community assembly,their effects on the processes of individual mortality and recruitment in natural forest regeneration,as well as their relative contributions,are still poorly understood.To address this,we established a 12-ha permanent plot in a subtropical evergreen broad-leaved forest area and measured microtopographic variables such as elevation,slope,aspect,and terrain position index(TPI)using a total station.We monitored the individual mortality and recruitment in forest natural regeneration through repeated surveys at 5-year intervals.We fitted spatial covariance models to jointly use multiple factors from three groups of variables(microtopographic effect,neighborhood density effects,neighborhood size effects)as explanatory variables to analyze their roles in driving the mortality and recruitment of all individual and 12 dominant species in forest natural regeneration at the neighborhood scale.Our results show that:(1)In the crucial early stages of secondary forest restoration,natural regeneration is influenced by a synergy of environmental filtering,due to microtopographic heterogeneity,and resource competition among plants.(2)For distinct species responses,evergreen dominant species'mortality is largely explained by neighborhood effects,while deciduous species are more affected by topographic factors.Furthermore,the adverse effects of larger conspecific trees on younger trees indicate a pattern of competitive pressure leading to mortality among regenerating trees,such pattern emphasis the influence of parent trees on natural regeneration.(3)As trees grow,their interaction with these stressors evolves,suggesting a shift in their resource acquisition strategies and response to neighborhood effects and environmental factors.Despite these changes,the relative importance of topographic factors in determining survival and recruitment success remains constant.This research highlights the importance of considering both environmental and neighborhood effects in forest management,particularly in early secondary forest restoration.

外文关键词：

Natural regenerationMicrotopographyNeighborhood effectsMortality and recruitment

作者：

Haonan Zhang、Xingshuo Zhang、Yingying Lv、Yanyan Ni、Baokun Xu、Xiangnan Han、Xiao Cao、Qingpei Yang、Wanggu Xu、Zhedong Qian

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作者单位：

Innovative Research Team for Forest Restoration Mechanisms,Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment(MEE),Nanjing 210042,China

College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China

基金：

Innovative Team Project of Nanjing Institute of Environmental Sciences MEESino-German Environmental Partnership Phase ⅢCentral Public Welfare Scientific Institution Basal Research Fund,MEEBiodiversity Survey,Observation and Assessment Program of Ministry of Ecology and Environment of ChinaNational Environmental Protection Public Welfare Industry Targeted Research Fund

项目编号：

ZX2023QT022GYZX210302201509042

出版年：

2024

DOI：

10.1016/j.fecs.2024.100169

森林生态系统(英文版)

北京林业大学

森林生态系统(英文版)

CSTPCD

影响因子：0.09

ISSN：2095-6355

年,卷(期)：2024.11(1)

参考文献量75