Changes in ecological stoichiometry and nutrient resorption in Castanopsis hystrix plantations along an urbanization gradient in the lower subtropics  

作　　者：Feifan Li Bing Sun Zhaowan Shi Nancai Pei 

机构地区：[1]Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou,510520,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第6期2323-2331,共9页林业研究（英文版）

基　　金：The work was supported by the National Key Research and Development Program of China(2017YFC0505606);National Natural Science Foundation of China(31570594,31600449);Forestry Science and Technology Innovation Project of Guangdong Province(2021-2023).

摘　　要：The stoichiometry of carbon,nitrogen and phosphorous in plants can reflect the interactions between plants and their environment.The interplay between plant nutrients,climatic factors,and soil properties and the underlying regulatory mechanisms are pillars of ecology but remain underexplored.In this study of plant C-N-P stoichiometry and nutrient resorption in Castanopsis hystrix groves in three cities(Guangzhou,Zhongshan,and Lechang)that represent an urban-rural gradient in Guangdong Province,South China,we explored potential relationships among NO_(2) concentrations,diameter at breast height(DBH),and resident human population.Mean annual temperature,mean annual precipitation,insolation duration per year,and the human resident population differed significantly among the three cities.Soil C-N-P was always highest in suburban Lechang,and the concentration of NO_(2) was highest in urban Guanghzou(55.33±0.67μg m^(-3))and positively correlated with the resident population and leaf N:P.Our findings suggest that C-N-P stoichiometry of C.hystrix was better explained by NO_(2)than by soil C-N-P stoichiometry and that nutrient resorption was better explained by leaf nutrients and DBH than by NO_(2) and soil stoichiometry.Our study supports the hypothesis that rapid urbanization influences NO_(2) concentrations and microclimate,which may jointly change the stoichiometry of plant nutrients in the forest ecosystems.

关 键 词：Ecological stoichiometry Nutrient cycling Plant-environment interaction Subtropical forest Urban–rural gradient 

分 类 号：S718.5[农业科学—林学]