Variations of root and heterotrophic respiration along environmental gradients in China’s forests  

作　　者：Pin Li Yuanhe Yang Jingyun Fang 

机构地区：[1]Department of Ecology,and Key Laboratory for Earth Surface Processes of the Ministry of Education,Peking University,Beijing 100871,China [2]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

出　　处：《Journal of Plant Ecology》2013年第5期358-367,共10页植物生态学报（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China(31021001);National Basic Research Program of China on Global Change(2010CB950600);Ministry of Science&Technology(2010DFA31290).

摘　　要：Aims Root and heterotrophic respiration may respond differently to environmental variability,but little evidence is available from largescale observations.Here we aimed to examine variations of root and heterotrophic respiration across broad geographic,climatic,soil and biotic gradients.Methods We conducted a synthesis of 59 field measurements on root and heterotrophic respiration across China’s forests.Important Findings Root and heterotrophic respiration varied differently with forest types,of which evergreen broadleaf forest was significantly different from those in other forest types on heterotrophic respiration but without statistically significant differences on root respiration.The results also indicated that root and heterotrophic respiration exhibited similar trends along gradients of precipitation,soil organic carbon and satellite-indicated vegetation growth.However,they exhibited different relationships with temperature:root respiration exhibited bimodal patterns along the temperature gradient,while heterotrophic respiration increased monotonically with temperature.Moreover,they showed different relationships with MOD17 GPP,with increasing trend observed for root respiration whereas insignificant change for heterotrophic respiration.In addition,root and heterotrophic respiration exhibited different changes along the age sequence,with insignificant change for root respiration and decreasing trend for heterotrophic respiration.Overall,these results suggest that root and heterotrophic respiration may respond differently to environmental variability.Our findings could advance our understanding on the different environmental controls of root and heterotrophic respiration and also improve our ability to predict soil CO_(2) flux under a changing environment.

关 键 词：enhanced vegetation index forest age heterotrophic respiration LATITUDE mean annual temperature mean annual precipitation root respiration GPP 

分 类 号：S71[农业科学—林学]