摘要
湿地由于具有较高的初级生产力以及较低的有机质降解速率而成为缓解全球变暖的潜在有效碳汇.虽然近年来中国湿地生态系统CO2交换过程及其影响机制研究取得了一系列进展,但尚缺乏对数据进行系统性整合分析.基于29篇文献的数据,对中国21个典型湿地植被净生态系统CO2交换(NEE)、生态系统呼吸(Reco)、总初级生产力(GPP)、NEE的光响应参数以及Reco的温度响应参数进行整合分析,并探讨了这些指标对温度与降雨的响应.结果表明:年尺度上,气温和降雨量对NEE(R2=50%,R2=57%)、GPP(R2=60%,R2=50%)和Reco(R2=44%,R2=50%)均有显著影响(P<0.05).生长季尺度上,NEE(R2=50%)、GPP(R2=36%)和Reco(R2=19%)与气温呈显著相关(P<0.05);同时NEE(R2=33%)和GPP(R2=25%)也与降雨量呈显著相关(P<0.05),但Reco与降雨量的相关关系不显著(P>0.05).生长季降雨量与最大光合速率(Amax)之间呈显著相关(P<0.01),但与表观量子产率(α)、白天生态系统呼吸速率(Reco,day)无显著相关(P>0.05).生长季气温对α、Amax和Reco,day均无显著影响(P>0.05).生态系统基础呼吸速率(Rref)与降雨量无显著相关(P>0.05),但是生态系统呼吸的温度敏感系数(Q10)与降雨量呈显著的线性负相关(P<0.05),同时气温对Q10(R2=0.35)、Rref(R2=0.46)均产生显著影响(P<0.05).
Wetland can be a potential efficient sink to reduce global warming due to its higher primary productivity and lower carbon decomposition rate. While there has been a series progress on the influence mechanism of ecosystem CO2 exchange over China ＇s wetlands,a systematic metaanalysis of data still needs to be improved. We compiled data of ecosystem CO2 exchange of 21 typical wetland vegetation types in China from 29 papers and carried out an integrated analysis of air temperature and precipitation effects on net ecosystem CO2exchange（ NEE）,ecosystem respiration（ Reco）,gross primary productivity（ GPP）,the response of NEE to PAR,and the response of Reco to temperature. The results showed that there were significant responses（ P 〈0. 05） of NEE（ R2=50%,R2= 57%）,GPP（ R2= 60%,R2= 50%） Reco（ R2= 44%,R2= 50%） with increasing air temperature and enhanced precipitation on the annual scale. On the growing season scale,air temperature accounted for 50% of the spatial variation of NEE,36% of GPP and 19% of Reco,respectively. Both NEE（ R2= 33%） and GPP（ R2= 25%） were correlated positively with precipitation（ P 〈0. 05）. However,the relationship between Recoand precipitation was not significant（ P 〈0.05）. Across different Chinese wetlands,both precipitation and temperature had no significant effect on apparent quantum yield（ α） or ecosystem respiration in the daytime（ Reco,day,P 〉0. 05）. The maximum photosynthesis rate（ Amax） was remarkably correlated with precipitation（ P 〉0. 01）,but not with air temperature. Besides,there was no significant correlation between basal respiration（ Rref） and precipitation（ P 〉0. 05）. Precipitation was negatively correlated with temperature sensitivity of Reco（ Q10,P 〈0. 05）. Furthermore,temperature accounted for 35% and 46% of the variations in temperature sensitivity of Reco（ Q10） and basal respiration（ Rref,P 〈0. 05）,respectively.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第10期2978-2990,共13页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(41301083)
国家科技支撑计划项目(2011BAC02-B01)资助
关键词
气温
降雨量
中国湿地
生态系统CO2交换
光响应
温度响应
air temperature
precipitation
Chinese wetlands
ecosystem CO2exchange
light response
temperature response
