Zhao Yuping; Zhang Xianzhou; Shi Peili; Wang Jingsheng; Wu Jianshuang
Source Publicationjournalofresourcesandecology
AbstractDrought may impact the net ecosystem exchange of CO_2 (NEE) between grassland ecosystems and the atmosphere during growth seasons. Here, carbon dioxide exchange and controlling factors in alpine grassland under drought stress in the hinterland of Tibetan Plateau (Damxung, Tibet, China) were investigated. Data were obtained using the covariance eddy technique in 2009. Severe drought stress appeared in the early growing season (May to early July) and September. Drought conditions during the early growing season limited grass production and the green leaf area index (GLAI) increased slowly, with an obvious decline in June. When encountering severe water stress, diurnal patterns of NEE in the growth season altered with a peak carbon release around 16:00 h or a second carbon uptake period before sunset. NEE variations in daytime related most closely with θ other than PAR when daily averaged θ Ta>θ, GLAI>θ>PPT, and Ta>GLAI>PAR. Seasonality of GLAI explained 60.7% and 76.1% of seasonal variation in NEE and GPP, respectively. GPP or NEE was more sensitive than Reco to variation in GLAI, and ecosystem water conditions.
Document Type期刊论文
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Zhao Yuping,Zhang Xianzhou,Shi Peili,et al. impactofdroughtstressonnetco2exchangeaboveanalpinegrasslandecosysteminthecentraltibetanplateau[J]. journalofresourcesandecology,2013,4(4):327.
APA Zhao Yuping,Zhang Xianzhou,Shi Peili,Wang Jingsheng,&Wu Jianshuang.(2013).impactofdroughtstressonnetco2exchangeaboveanalpinegrasslandecosysteminthecentraltibetanplateau.journalofresourcesandecology,4(4),327.
MLA Zhao Yuping,et al."impactofdroughtstressonnetco2exchangeaboveanalpinegrasslandecosysteminthecentraltibetanplateau".journalofresourcesandecology 4.4(2013):327.
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