摘要
As one component of ChinaFLUX, the measurement of CO2 flux using eddy covariance over subtropical planted coniferous ecosystem in Qianyanzhou was conducted for a long term. This paper discusses the seasonal dynamics of net ecosystem exchange (NEE), ecosystem respiration (RE) and gross ecosystem exchange (GEE) between the coniferous ecosystem and atmosphere along 2003 and 2004. The variations of NEE, RE and GEE show obvious seasonal variabilities and correlate to each other, i.e. lower in winter and drought season, but higher in summer; light, temperature and soil water content are the main factors determining NEE; air temperature and water vapor pressure deficit (VPD) influence NEE with stronger influence from VPD. Under the proper light condition, drought stress could decrease the temperature range for carbon capture in planted coniferous, air temperature and precipitation controlled RE; The NEE, RE, and GEE for planted coniferous in Qianyanzhou are -387.2 gC·m-2 a-1,1223.3 g C·m-2 a-1, -1610.4 g C·m-2 a-1 in 2003 and -423.8 g C·m-2 a-1, 1442.0 g C·m-2 a-1, -1865.8 g C·m-2 a-1 in 2004, respectively, which suggest the intensive ability of plantation coniferous forest on carbon absorbing in Qianyanzhou.
As one component of ChinaFLUX, the measurement of CO2 flux using eddy covariance over subtropical planted coniferous ecosystem in Qianyanzhou was conducted for a long term. This paper discusses the seasonal dynamics of net ecosystem exchange (NEE), ecosystem respiration (RE) and gross ecosystem exchange (GEE) between the coniferous ecosystem and atmosphere along 2003 and 2004. The variations of NEE, RE and GEE show obvious seasonal variabilities and correlate to each other, i.e. lower in winter and drought season, but higher in summer; light, temperature and soil water content are the main factors determining NEE; air temperature and water vapor pressure deficit (VPD) influence NEE with stronger influence from VPD. Under the proper light condition, drought stress could decrease the temperature range for carbon capture in planted coniferous, air temperature and precipitation controlled RE; The NEE, RE, and GEE for planted coniferous in Qianyanzhou are -387.2 gC·m-2 a-1,1223.3 g C·m-2 a-1, -1610.4 g C·m-2 a-1 in 2003 and -423.8 g C·m-2 a-1, 1442.0 g C·m-2 a-1, -1865.8 g C·m-2 a-1 in 2004, respectively, which suggest the intensive ability of plantation coniferous forest on carbon absorbing in Qianyanzhou.
作者
LIU Yunfen, YU Guirui, WEN Xuefa, WANG Yinghong, SONG Xia, LI Ju, SUN Xiaomin, YANG Fengting, CHEN Yongrui & LIU Qijing Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
College of Resources and Environmental Science, China Agricultural University, Beijing 100094, China
基金
This work was supported by the Chinese Academy of Sciences (Grant No. KZ-CX1-SW-01-01A2, KZ-CX-SW-01-01B-02)
the Ministry of Science and Technology of China (Grant No.2002CB412501)
Institute Geography Science Natural Resource Research, CAS, the Knowledge Innovation Engineering Backbone Science Plan (CX10G-E01-03-05)
respectively. We also appreciate the technical assistance provided by Campbell Scientific Inc, USA, and its representative, the Tempo com-pany in China.
