Winter-grazing reduces methane uptake by soils of a typical semi-arid steppe in Inner Mongolia, China
Winter-grazing reduces methane uptake by soils of a typical semi-arid steppe in Inner Mongolia, China
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DOI：
10.1016/j.atmosenv.2007.03.017
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发表时间：
2007-09-01
影响因子：
5
通讯作者：
Zheng, Xunhua
中科院分区：
文献类型：
--
作者：
Liu, Chunyan;Holst, Jirko;Zheng, Xunhua
草原生态系统被认为是大气甲烷(CH4)的重要汇，放牧被认为可以减少对CH4的吸收。然而，需要确凿的实验证据来证明这一假设。利用全自动箱式测量系统，对内蒙古典型草原生态系统--羊草草原的CH4吸收进行了连续高频(每隔3h)测量。调查了两种管理制度：1999年以来不放牧(UG99)和2001年以来冬季放牧(WG01)。在2004年6月至9月、2005年5月至9月和2006年6月3月期间连续进行了测量。在所有这些时期，平均CH4摄取量(+/-S.E.)显著降低。在WG01(28+/-0.7微克Cm(-2)h(-1))与UG99(56+/-1.0微克Cm(-2)h(-1))(p
Steppe ecosystems are regarded as an important sink of atmospheric methane (CH4) and grazing is hypothesized to reduce CH4 uptake. However, firm experimental evidence is required to prove this hypothesis. Using a fully automated, chamber-based measuring system, we conducted continuous high-frequency (at a 3-h interval) measurements of CH4 uptake in a Leymus chinensis steppe, which is a typical grassland ecosystem in Inner Mongolia, China. Two management regimes were investigated: ungrazed since 1999 (UG99) and winter-grazed since 2001 (WG01). Measurements were carried out continuously during the periods of June-September 2004, May-September 2005 and March June 2006. During all of these periods, significantly lower mean CH4 uptake (+/- S.E.) at WG01 (28 +/- 0.7 mu g C m(-2) h(-1)) as compared to UG99 (56 +/- 1.0 mu g C m(-2) h(-1)) (p