The influence of degradation of the swamp and alpine meadows on CH4 and CO2 fluxes on the Qinghai-Tibetan Plateau
The influence of degradation of the swamp and alpine meadows on CH4 and CO2 fluxes on the Qinghai-Tibetan Plateau
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DOI：
10.1007/s12665-009-0193-3
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发表时间：
2010-04
影响因子：
2.8
通讯作者：
Junfeng Wang;Genxu Wang;Hongchang Hu;Qingbai Wu
中科院分区：
文献类型：
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作者：
Junfeng Wang;Genxu Wang;Hongchang Hu;Qingbai Wu
对青藏高原高寒沼泽草甸和高寒草甸不同退化程度的CH 4和CO2通量进行了为期12个月的观测。确定了气温、土壤温度和湿度以及地下水位和融冻层的深度。对于沼泽草甸，退化程度越大，碳排放量越小。未退化沼泽草甸样地的CH 4排放量分别是中度和重度退化样地的1.09-3.5倍和2.5-11.27倍，CO2排放量分别是中度和重度退化样地的1.08-1.69倍和1.41-4.43倍。对于高寒草甸，退化程度越大，CH 4消耗量和CO2排放量越大。重度退化高寒草甸的CH 4消耗量是未退化和中度退化高寒草甸的6.6-21倍和1.1-5.25倍，CO2排放量是未退化和中度退化高寒草甸的1.05-78.5倍和1.04-6.28倍。2个样点的CH 4和CO2排放通量与气温、土壤温度和表层土壤（0-5 cm）水分呈显著正相关（R2> 0. 59，P <0. 0 - 5），表明这些是影响CH 4和CO2排放通量的主要环境因子。
CH4and CO2fluxes from a high-cold swamp meadow and an alpine meadow on the Qinghai-Tibetan Plateau, subject to different degrees of degradation, were measured over a 12-month period. Air temperature, soil temperature and moisture, and the depths of the water table and thawing-freezing layer were determined. For swamp meadows, the greater the degradation, the lesser the carbon efflux. CH4emissions at the nondegraded swamp meadow site were 1.09–3.5 and 2.5–11.27 times greater, and CO2emissions 1.08–1.69 and 1.41–4.43 times greater, respectively, than those from moderately and severely degraded sites. For alpine meadows, the greater the degradation, the greater the CH4consumption and CO2emissions. CH4consumption at the severely degraded alpine meadow site was 6.6–21 and 1.1–5.25 times greater, and CO2emissions 1.05–78.5 and 1.04–6.28 times greater, respectively, than those from the nondegraded and moderately degraded sites. The CH4and CO2fluxes at both sites were significantly correlated (R2> 0.59,P< 0.05) with air temperature, soil temperature, and topsoil (0–5 cm depth) moisture, indicating these to be the main environmental factors affecting such fluxes.