Title: Observing characteristics of CO_2 flux and its influencing factors over Xilinhot grassland
Abstract:Based on the continuous measurement of surface fluxes data by eddy covariance during2009- 2011 from Xilinhot National Climatological Observatory,the characteristics of CO2 flux and its influencing fac...Based on the continuous measurement of surface fluxes data by eddy covariance during2009- 2011 from Xilinhot National Climatological Observatory,the characteristics of CO2 flux and its influencing factors were investigated. Results show that diurnal,seasonal and annual variation characteristics of CO2 flux are obvious. The annual variation rate in three years of NEE reaches 200 g·m- 2,the maximal seasonal one amounts to 460 g·m- 2,and the maximal daily variation amplitude in growth seasons is 0. 25 mg·m- 2·s- 1. Analysis on carbon fluxes and meteorological factors such as temperature,water and radiation at different time scales shows that daily variation of CO2 flux is mainly affected by temperature and photosynthetically active radiation( PAR),while annual and seasonal variations are chiefly influenced by precipitation and soil moisture content. The intensity and time distribution of precipitation are the key factors to CO2 flux. Soil water more than 15% will promote the growth of herbage.Read More
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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