Global patterns of the responses of leaf-level photosynthesis and respiration in terrestrial plants to experimental warming  

作　　者：Junyi Liang Jianyang Xia Lingli Liu Shiqiang Wan 

机构地区：[1]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Xiangshan,Beijing 100093,China [2]University of Chinese Academy of Sciences,Yuquanlu,Beijing 100049,China [3]State Key laboratory of Cotton Biology,Key Laboratory of Plant Stress Biology,College of Life Sciences,Henan University,Kaifeng,Henan 475004,China

出　　处：《Journal of Plant Ecology》2013年第6期437-447,共11页植物生态学报（英文版）

基　　金：National Natural Science Foundation of China(41030104/D0308,30925009);the Ministry of Science and Technology of China(2013CB956300).

摘　　要：Aims The balance between leaf photosynthesis and respiration of terrestrial plants determines the net carbon(C)gain by vegetation and consequently is important to climate–C cycle feedback.This study is to reveal the global patterns of the responses of leaf-level net photosynthesis and dark respiration to elevated temperature.Methods Data for leaf-level net photosynthesis rate(P_(n))and dark respiration rate(R_(d))in natural terrestrial plant species with standard deviation(or standard error or confidence interval)and sample size were collected from searched literatures on Web of Science.Then a metaanalysis was conducted to estimate the effects of experimental warming on leaf-level P_(n) and R_(d) of terrestrial plants.Important findings Across all the plants included in the analysis,warming enhanced P_(n) and R_(d) significantly by 6.13 and 33.14%,respectively.However,the responses were plant functional type(PFT)specific.Specifically,photosynthesis of C_(4) herbs responded to experimental warming positively but that of C_(3) herbs did not,whereas their respiratory responses were similar,suggesting C_(4) plants would benefit more from warming.The photosynthetic response declined linearly with increasing ambient temperature.The respiratory responses linearly enhanced with the increase in warming magnitude.In addition,a thermal acclimation of R_(d),instead of P_(n),was observed.Although greater proportion of fixed C was consumed(greater R_(d)/P_(n) ratio),warming significantly enhanced the daily net C balance at the leaf level.This provides an important mechanism for the positive responses of plant biomass and net primary productivity to warming.Overall,the findings,including the contrastive responses of different PFTs and the enhancement in daily leaf net C balance,are important for improving model projection of the climate–C cycle feedback.

关 键 词：ACCLIMATION META-ANALYSIS plant functional type PHOTOSYNTHESIS RESPIRATION 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]