Solar radiation effects on leaf nitrogen and phosphorus stoichiometry of Chinese fir across subtropical China

作     者：Ran Tong Yini Cao Zhihong Zhu Chenyang Lou Benzhi Zhou Tonggui Wu Ran Tong;Yini Cao;Zhihong Zhu;Chenyang Lou;Benzhi Zhou;Tonggui Wu

作者机构：Qianjiangyuan Forest Ecosystem Research StationResearch Institute of Subtropical ForestryChinese Academy of ForestryHangzhou 311400China East China Coastal Forest Ecosystem Long-term Research StationResearch Institute of Subtropical ForestryChinese Academy of ForestryHangzhou 311400China Guangdong Provincial Key Laboratory of Water Quality 313 Improvement and Ecological Restoration for WatershedsInstitute of Environmental and Ecological EngineeringGuangdong 314 University of TechnologyGuangzhou 510006China Zhejiang A&F UniversityHangzhou 311300China 

出 版 物：《Forest Ecosystems》 (森林生态系统（英文版）)

年 卷 期：2021年第8卷第4期

页      面：831-840页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：funded by the National Key Research and Development Program of China(No.2016YFD0600202-4) the Fundamental Research Funds for the Central Non-profit Research Institution of Chinese fir Academy of Forestry(Nos.CAFYBB2017ZX002-2 and CAFYBB2020ZE001) 

主　　题：Solar radiation Leaf Soil Nitrogen and phosphorus Stoichiometry Chinese fir 

摘      要：Background:Solar radiation(SR)plays critical roles in plant physiological processes and ecosystems ***,the exploration of SR influences on the biogeochemical cycles of forest ecosystems is still in a slow progress,and has important implications for the understanding of plant adaption strategy under future environmental ***,this research was aimed to explore the influences of SR on plant nutrient characteristics,and provided theoretical basis for introducing SR into the establishment of biochemical models of forest ecosystems in the future ***:We measured leaf nitrogen(N)and phosphorus(P)stoichiometry in 19 Chinese fir plantations across subtropical China by a field *** direct and indirect effects of SR,including global radiation(Global R),direct radiation(Direct R)and diffuse radiation(Diffuse R)on the leaf N and P stoichiometry were ***:The linear regression analysis showed that leaf N concentration had no association with SR,while leaf P concentration and N:P ratio were negatively and positively related to SR,*** least squares path model(PLS-PM)demonstrated that SR(*** R and Diffuse R),as a latent variable,exhibited direct correlations with leaf N and P stoichiometry as well as the indirect correlation mediated by soil P *** direct associations(path coefficient=−0.518)were markedly greater than indirect associations(path coefficient=−0.087).The covariance-based structural equation modeling(CB-SEM)indicated that SR had direct effects on leaf P concentration(path coefficient=−0.481),and weak effects on leaf N *** high SR level elevated two temperature indexes(mean annual temperature,MAT;≥10°C annual accumulated temperature,≥10℃ AAT)and one hydrological index(mean annual evapotranspiration,MAE),but lowered the soil P ***,MAE and soil P content could affect the leaf P concentration,which cause the indirect effect of SR on leaf P concentration(pa