长江滩地杨树林生态系统的碳通量特征  

Characteristics of Carbon Flux of Populus Forest in the Reaches of Yangtze River in Hunan

作　　者：王妍[1] 彭镇华[2] 江泽慧[3] 刘杏娥[3] 张旭东[2] 周金星[2] 孙启祥[2] 

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091 [2]中国林业科学研究院林业研究所,北京100091 [3]国际竹藤网络中心,北京100102

出　　处：《林业科学》2009年第11期156-160,共5页Scientia Silvae Sinicae

基　　金：国家林业局948项目(2006-4-16)

摘　　要：The eddy-covariance system monitored the carbon flux of Populus forest ecosystem in the middle and lower reaches of Yangtze River in Yueyang,Hunan Province.Daily and monthly variation of carbon flux between forest ecosystem and the relationship of carbon flux and environmental factors were analyzed.The results showed that the regulated variation and process of day and month of carbon flux of forest ecosystem.In daytime,the ecosystem began to absorb CO2 at about 7:30 am,and reached to the max.at about 12:00,then went down slowly,at about 18:00,the ecosystem began to release CO2.At the period of the end of March and the early of April,the Populus began to unfold leaves,and the forest ecosystem started to absorb CO2,namely carbon sink.At the period of the end of October to the early of November,the photosynthesis of leaves stopped by defoliation,at the same time,the forest ecosystem became carbon source.The paper also analyzed the relationships of carbon flux of forest ecosystem and environmental factors.The results were as follows:when the PAR>1 μmol·m-2s-1,the relationship of carbon flux and PAR was different in different range of temperature.When the PAR>1 μmol·m-2s-1,air temperature and carbon flux had quadratic equation.Namely when the air temperature arose,the carbon flux of nighttime was augmented.The nighttime CO2 flux and soil temperature in 5 cm deep had exponential correlation.choosing a day from different month and ridding off the carbon flux for u<0.2 m·s-1,the 30 min average carbon flux in nighttime and soil heat flux in 2 cm deep that had the relationship of exponential correlation.The eddy-covariance system monitored the carbon flux of Populus forest ecosystem in the middle and lower reaches of Yangtze River in Yueyang,Hunan Province.Daily and monthly variation of carbon flux between forest ecosystem and the relationship of carbon flux and environmental factors were analyzed.The results showed that the regulated variation and process of day and month of carbon flux of forest ecosystem.In daytime,the ecosystem began to absorb CO_2 at about 7：30 am,and reached to the max.at about 12：00,then went down slowly,at about 18：00,the ecosystem began to release CO_2.At the period of the end of March and the early of April,the Populus began to unfold leaves,and the forest ecosystem started to absorb CO_2,namely carbon sink.At the period of the end of October to the early of November,the photosynthesis of leaves stopped by defoliation,at the same time,the forest ecosystem became carbon source.The paper also analyzed the relationships of carbon flux of forest ecosystem and environmental factors.The results were as follows：when the PAR1 μmol·m-2s-1,the relationship of carbon flux and PAR was different in different range of temperature.When the PAR1 μmol·m-2s-1,air temperature and carbon flux had quadratic equation.Namely when the air temperature arose,the carbon flux of nighttime was augmented.The nighttime CO_2 flux and soil temperature in 5 cm deep had exponential correlation.choosing a day from different month and ridding off the carbon flux for u0.2 m·s-1,the 30 min average carbon flux in nighttime and soil heat flux in 2 cm deep that had the relationship of exponential correlation.

关 键 词：杨树林 碳通量 环境因子 响应关系 

分 类 号：S718.55[农业科学—林学]