Chen Huai, Wu Ning, Gao Yongheng, Wang Yanfen, Luo Peng, Tian Jianqing
Chengdu Institute of Biology, The Chinese Academy of Sciences, Chengdu 610041, China; College of Resource and Environment Science, Chongqing University, Chongqing 400044, China.
Sci Total Environ. 2009 Jan 15;407(3):1097-104. doi: 10.1016/j.scitotenv.2008.10.038. Epub 2008 Nov 20.
This study was aimed to understand the spatial variation of CH(4) emissions from alpine wetlands in Southwest China on a field-scale in two phenological seasons, namely the peak growing season and the spring thaw. Methane emission rates were measured at 30 plots, which included three kinds of environmental types: dry hummock, Carex muliensis and Eleocharis valleculosa sites. There were highly spatial variations of methane emissions among and within different environmental types in both phenological seasons. Mean methane emission rates ranged from 1.1 to 37.0 mg CH(4) m(-2) h(-1) in the peak growing season and from 0.004 to 0.691 mg CH(4) m(-)(2) h(-1) in the spring thaw. In the peak growing season, coefficients of variation (CV) averaged 38% among environmental types and 64% within environmental types; while in the spring thaw, CV were on the average 61% among environmental types and 96% within environmental types. The key influencing factors were the standing water table and the plant community height in the peak growing season, while in the spring thaw, no significant correlations between factors and methane emissions were found.
本研究旨在了解中国西南地区高寒湿地在两个物候季节（即生长旺季和春季解冻期）田间尺度上CH₄排放的空间变化。在30个样地测量了甲烷排放速率，这些样地包括三种环境类型：干燥草丘、多脉苔草和谷生荸荠地。在两个物候季节中，不同环境类型之间以及内部的甲烷排放均存在高度空间变化。生长旺季的平均甲烷排放速率为1.1至37.0 mg CH₄ m⁻² h⁻¹，春季解冻期为0.004至0.691 mg CH₄ m⁻² h⁻¹。在生长旺季，环境类型间变异系数（CV）平均为38%，环境类型内为64%；而在春季解冻期，环境类型间CV平均为61%，环境类型内为96%。生长旺季的关键影响因素是积水水位和植物群落高度，而在春季解冻期，未发现各因素与甲烷排放之间存在显著相关性。
