Controlling Factors of Net Ecosystem CO2 Exchange in a Vineyard of Northwest China
Orchard ecosystem is an important part of terrestrial ecosystem, and its net ecosystem CO2 exchange (NEE) influences local carbon budget significantly.To understand the variation of net ecosystem CO2 exchange (NEE) in the vineyard and its controlling factors, carbon fluxes were measured using eddy covariance system in a vineyard of arid region of northwest China during 2008 to 2010.Results show that annual NEE in the vineyard was-820,-824 and-961 gC · m-2 · yr-1 , and nighttime carbon loss was 214, 241 and 286 gC · m-2 · yr-1 for 3 years,respectively.In addition, annual NEE was greater in the vineyard ecosystem than in most of forest, grassland and farmland ecosystems, indicating that vineyard ecosystem had stronger capacity of carbon sink.Main factors influencing NEE in the vineyard were canopy conductance and net radiation.When canopy conductance (gc) and net radiation (R n) respectively were less than 0.02 m · s-1 and 200 W · m-2, NEE had a linear relationship with gc and Rn (NEE=-13.24gc-0.022, R2 =0.49.NEE=-0.001 4R n-0.028, R2 =0.55) respectively.
net ecosystem CO2 exchange eddy covariance vineyards arid region
W H Guo X Y Jiao Y Gao
Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing 210098, China
国内会议
南京
英文
1-9
2015-07-25（万方平台首次上网日期，不代表论文的发表时间）