Background:The demographic trade-offs(i.e.growth and survival)play important roles in forest dynamics and they are driven by multiple factors,including species'inherent life-history strategies(such as shade-tolerance and mycorrhizal type),neighborhood interactions(such as conspecific negative density dependence,CNDD),and abiotic environment pressures.Although studies found that CNDD occurred in tropical and temperate forest,attempts to identify how the variations in CNDD control their impacts on growth and survival remain debate.In the present study,we conducted an extensive field survey,and analyzed demographic rates from 24 co-occurring temperate tree species,in order to test the importance of CNDD in shaping the growth-survival trade-offs.Results:Our study found that density dependence and environmental filtering were strong predictors for indi-vidual growth-survival trade-offs,while they showed variations across shade-intolerant and ectomycorrhizal species,as well as saplings and juveniles with more negative CNDD.Species growth showed positive relationship with mortality.And our results also support the fact that CNDD drives species growth-survival trade-offs at the community level with environmental stress.Conclusions:Our study indicates that biotic interactions such as density dependence and environment filtering played an important role in growth-survival trade-offs,and confirmed that the Janzen-Connell hypothesis in temperate forest was associated with species life-history strategies.In addition,shade-tolerance,mycorrhizal type and life-stage of forest species responded differently to CNDD,thus providing insights regarding different com-munity assembly mechanisms and their interactions.Therefore,it is important to take species survival with growth and species life-history strategies into account when focusing on forest dynamics.

Jianghuan Qin;Chunyu Fan;Yan Geng;Chunyu Zhang;Xiuhai Zhao;Lushuang Gao

Research Center of Forest Management Engineering of State Forestry and Grassland Administration,Beijing Forestry University,Beijing,100083,China

森林生态系统（英文版）

[1]Jianghuan Qin;Chunyu Fan;Yan Geng;Chunyu Zhang;Xiuhai Zhao;Lushuang Gao-.Drivers of tree demographic trade-offs in a temperate forest)[J].森林生态系统（英文版）,2022(04):475-482

CNDD,intolerant,Janzen

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