Methane emissions from wetlands on the Qinghai-Tibet Plateau
Methane emissions from wetlands on the Qinghai-Tibet Plateau
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DOI：
10.1007/bf02885940
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发表时间：
1999-12-01
影响因子：
--
通讯作者：
Sun, GY
中科院分区：
文献类型：
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作者：
Jin, HJ;Wu, J;Sun, GY
青藏高原寒冷淡水湿地的面积估计为0.133 × 10（6）km（2），表明甲烷潜力巨大。1996年7 ~ 8月在花石峡冻土站（HPS）进行的甲烷通量样带研究表明，高寒草甸、泥炭地、沙棘沼泽和次生沼泽的甲烷通量分别为43.18、12.96、-0.28和45.90mg·m（-2）·d（-1）。根据花石峡地区湿地面积百分比推算出该地区融化季CH 4平均通量为5.68 g.m（-2）。代表相似生态系统的4个固定样点的CH 4通量变化范围为-19.384-347.15mg·m（-2）。m（-2）·d（-1），各观测点的平均甲烷通量变化范围为6.54 ~ 71.97mg·m（-2）·d（-1）。在整个解冻季节，每个站点的CH 4排放量估计为1.21至10.65 g.m（-2），显示出强烈的空间变化。四个站点的CH 4通量也观察到季节变化：CH 4爆发时，春季解冻在5月和6月，CH 4通量增加后，随着土壤温度的升高。在夏季观测到的情景通量，这对平均CH 4通量的影响很大。根据湿地的分布、代表性的CH 4通量和解冻天数，QTP上寒冷湿地的CH 4年排放量估计约为0.7-0.9 Tg。CH 4释放中心位于长江源、黄河源和若尔盖泥炭地。
The areal extent of cold freshwater wetlands on the Qinghai-Tibet Plateau (QTP) is estimated at 0.133 x 10(6) km(2), suggesting a significant methane potential. Methane fluxes from wet alpine meadows, peatlands, Hippuris vulgaris mires and secondary marshes were 43.18, 12.96, -0.28 and 45.90 mg.m(-2).d(-1), respectively based on the transect flux studies at the Huashixia Permafrost Station (HPS) from July to August 1996. Average CH4 fluxes in the thaw season were extrapolated at 5.68 g.m(-2) according to the areal percentage of wetland areas in the Huashixia region. The CH4 fluxes at four fixed sites, representative of similar ecosystems, ranged from - 19.384-347.15 mg.m(-2). d(-1), and the average CH4 fluxes varied from 6.54 to 71.97 mg.m(-2).d(-1) at each site during the observation period from April to September 1997. The CH4 emissions at each site during the entire thaw season was estimated from 1.21 to 10.65 g.m(-2), displaying strong spatial variations. Seasonal variations of CH4 fluxes also were observed at four sites: CH4 outbursts occurred upon the spring thaw in May and June, CH4 fluxes increased afterwards with rising soil temperatures. Episodic fluxes were observed in summer, which influenced the average CH4 fluxes considerably. Annual CH4 emissions from cold wetlands on the QTP were estimated at about 0.7-0.9 Tg based on the distribution of wetlands, representative CH4 fluxes, and number of thaw days. The centers of CH4 releasing were located in the sources of the Yangtze and Yellow rivers, and Zoige Peatlands.