Trees species’ dispersal mode and habitat heterogeneity shape negative density dependence in a temperate forest  

作　　者：Lishunan Yang Daniel J.Johnson Zhichun Yang Xiaochao Yang Qiulong Yin Ying Luo Zhanqing Hao Shihong Jia 

机构地区：[1]School of Ecology and Environment,Northwestern Polytechnical University,Xi’an,Shaanxi,710072,China [2]Shaanxi Key Laboratory of Qinling Ecological Intelligent Monitoring and Protection,Northwestern Polytechnical University,Xi’an,Shaanxi,710072,China [3]School of Forest,Fisheries,and Geomatics Sciences,University of Florida,Gainesville,FL,USA [4]School of Geography and Tourism,Shaanxi Normal University,Xi’an,Shaanxi,710062,China

出　　处：《Forest Ecosystems》2023年第5期589-596,共8页森林生态系统（英文版）

基　　金：Shihong Jia was financially supported by the National Natural Science Foundation of China(Grant No.32001120);the Fundamental Research Funds for the Central Universities(Grant No.31020200QD026);Qiulong Yin was supported by the National Natural Science Foundation of China(Grant No.32001171);Ying Luo was supported by the Innovation Capability Support Program of Shaanxi(Grant No.2022KRM090).

摘　　要：Conspecific negative density dependence(CNDD)is a potentially important mechanism in maintaining species diversity.While previous evidence showed habitat heterogeneity and species’dispersal modes affect the strength of CNDD at early life stages of trees(e.g.,seedlings),it remains unclear how they affect the strength of CNDD at later life stages.We examined the degree of spatial aggregation between saplings and trees for species dispersed by wind and gravity in four topographic habitats within a 25-ha temperate forest dynamic plot in the Qinling Mountains of central China.We used the replicated spatial point pattern(RSPP)analysis and bivariate paircorrelation function(PCF)to detect the spatial distribution of saplings around trees at two scales,15 and 50 m,respectively.Although the signal was not apparent across the whole study region(or 25-ha),it is distinct on isolated areas with specific characteristics,suggesting that these characteristics could be important factors in CNDD.Further,we found that the gravity-dispersed tree species experienced CNDD across habitats,while for wind-dispersed species CNDD was found in gully,terrace and low-ridge habitats.Our study suggests that neglecting the habitat heterogeneity and dispersal mode can distort the signal of CNDD and community assembly in temperate forests.

关 键 词：BIODIVERSITY Conspecific negative density dependence Dispersal Replicated point patterns Temperate forest Topographic habitat 

分 类 号：S718.5[农业科学—林学]