Net water vapour exchange over a mixed needle and broad-leaved forest in Changbai Mountain during autumn

编号 zgly0000302713

文献类型 期刊论文

文献题名 Net water vapour exchange over a mixed needle and broad-leaved forest in Changbai Mountain during autumn

学科分类 220.1060;森林生态学

作者 HANShijie  WENXuefa  YUGuirui  SUNXiaomin  LIQingkang  RENChuanyou 

作者单位 InstituteofAppliedEcology 

母体文献 Journal of Geographical Sciences;地理学报: 英文版 

年卷期 2003,13(4)

页码 463-468

年份 2003 

分类号 S718.5  Q948.2 

关键词 水汽交换  潜热流量  长白山  秋季  针阔混交林  CO2通量 

文摘内容 Water vapour and CO2 fluxes were measured by the eddy-covariance technique above a mixed needle and broad-leaved forest with affiliated meteorological measurements in Changbai Mountain as part of China's FLUX projects since late August in 2002. Net water vapour exchange and environmental control over the forest were examined from September 1 to October 31 in 2002. To quantify the seasonal dynamics, the transition period was separated into leafed, leaf falling and leafless stages according to the development of leaf area. The results showed that (a) seasonal variation of water vapour exchange was mainly controlled by net radiation (Rn) which could account for 78.5%, 63.4% and 56.6% for leafed, leaf falling and leafless stages, respectively, while other environmental factors' effects varied evidently; (b) magnitude of water vapour flux decreased remarkably during autumn and daily mean of water vapour exchange was 24.2 mg m^-2 s^-1 (100%), 14.8 mg m^-2 s^-1 (61.2%) and 10.3 mg m^-2 s^-1 (42.6%) for leafed, leaf falling and leafless stage, respectively; and (c) the budget of water vapour exchange during autumn was estimated to be 87.1 kg H2O m2, with a mean of 1427.2 g H2O d^-1 varying markedly from 3104.0 to 227.5 g H2O m^-2d^-1。