Growing Season Ecosystem Respirations and Associated Component Fluxes in Two Alpine Meadows on the Tibetan Plateau

查看全文 作　　者：Qi-Wu [1,2]Hu;Qin [1,2]Wu;Guang-Min [1]Cao;Dong [1]Li;Rui-Jun [3]Long;Yue-Si [4]Wang

机构地区：[1]Northwest Institute of Plateau Biology, the Chinese Academy of Sciences, Xining 810001, China;[2]School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China;[3]College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;[4]Institute of Atmospheric Physics, the Chinese Academy of Sciences, Beijing 100029, China

出　　处：《Journal of Integrative Plant Biology》索引2008年第50卷第3期,共9页

基　　金：Field Station Foundation In the Domain of Resource and Environment, CAS and GEF program (052456 and CHA-GS-Y-4) 摘　　要：From 30 June to 24 September in 2003 ecosystem respiration (Re) in two alpine meadows on the Tibetan Plateau were measured using static chamber-and gas chromatography-(GC) based techniques. Simultaneously, plant removal treatments were set to partition Re into plant autotrophic respiration (Ra) and microbial heterotrophic respiration (Rh). Results indicated that Re had clear diurnal and seasonal variation patterns in both of the meadows. The seasonal variability of Re at both meadow sites was caused mainly by changes in Ra, rather than Rh. Moreover, at the Kobresia humilis meadow site (K_site), Ra and Rh accounted for 54% and 46% of Re, respectively. While at the Potentilla fruticosa scrub meadow (P_site), the counterparts accounted for 61% and 39%, respectively. T test showed that there was significant difference in Re rates between the two meadows (t = 2.387, P = 0.022). However, no significant difference was found in Rh rates, whereas a significant difference was observed in Ra rates between the two meadows. Thus, the difference in Re rate between the two meadows was mainly attributed to plant autotrophic respirations. During the growing season, the two meadows showed relatively low Q10 values, suggesting that Re, especially Rh was not sensitive to temperature variation in the growing season. Additionally, Re and Rh at the K_site, as well as Rh at the P_site was negatively correlated with soil moisture, indicating that soil moisture would also play an important role in respirations. 关键词：高山草地自养呼吸草甸生态系统

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Growing Season Ecosystem Respirations and Associated Component Fluxes in Two Alpine Meadows on the Tibetan Plateau

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