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 LIU Liangfeng,CHEN Huai**,PENG Changhui,et al.CH4 emissions under warming schemes from peatlands of different depths in the Zoige Plateau[J].Chinese Journal of Applied & Environmental Biology,2016,22(01):1-7.[doi:10.3724/SP.J.1145.2015.05022]





CH4 emissions under warming schemes from peatlands of different depths in the Zoige Plateau
刘亮锋 陈槐 彭长辉 朱求安 李宝鑫
1西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室 杨凌 712100
2中国科学院成都生物研究所山地生态恢复与生物资源利用重点实验室 成都 610041
3青海师范大学科学技术处 西宁 810008
LIU Liangfeng1 CHEN Huai2** PENG Changhui1 ZHU Qiuan1 & LI Baoxin3
1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Forestry, Northwest A&F University, Yangling 712100, China 2Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 3Department of Science and Technology, Qinghai Normal University, Xining 810008, China
peatlands methane incubation experiment warming DOC MBC
X171 (27)
不同深度泥炭所处的环境不同,对甲烷释放的影响也不同,温度是影响土壤甲烷释放的重要环境因子之一. 为了解温度变化对不同深度特别是深层泥炭甲烷释放的影响,通过模拟实验监测不同深度泥炭甲烷释放对增温(8 ℃和18 ℃)的响应特征,并分析土壤可溶性有机碳(DOC)和微生物量碳(MBC)对甲烷释放的影响. 结果显示,温度升高导致泥炭地总甲烷释放量降低,8 ℃时甲烷的总释放量(以CH4-C计)为(4.94 ± 0.70)mg m-2 d-1,18 ℃时为(3.16 ± 0.69)mg m-2 d-1. 不同深度泥炭甲烷释放对温度升高的响应不同,表层泥炭甲烷释放随温度的增加而增加,深层泥炭甲烷释放随温度增加而降低,这可能受不同深度土壤有机质所含碳种类的影响. 低温时DOC抑制甲烷释放,增温时DOC对甲烷释放没有影响,这可能是受DOC来源的控制. 甲烷释放随MBC含量的增加而降低. 综上认为随着气候变化,温度升高,若尔盖高原泥炭地甲烷的释放量可能降低. (图6 表1 参65)
With the warming of climate, much degradation has taken place in peatlands on Zoige Plateau. But its effect on the CH4 emission at soil of different depths remains unknown. In this study, soil of different depths from the Zoige Plateau was incubated at two temperatures (8 °C and 18 °C) to detect CH4 emission; the effects of dissolved organic carbon (DOC) and microbe biomass carbon (MBC) on CH4 emission were also determined. The results showed that enhanced temperature decreased CH4 emission from 4.94 ± 0.70 mg m-2 d-1 at 8 °C to 3.16 ± 0.69 mg m-2 d-1 at 18 °C. The peat at different depths showed different responses to warming. Probably due to the varying soil substrate quality among the whole profile, CH4 emission was increased at the surface but decreased at deeper layers. We also found that DOC had negative effect on CH4 emission at 8 °C but no effect at 18 °C, which should be correlated to the origin of DOC. MBC had a negative effect on CH4 emission. Based on the results, we can conclude that CH4 emission may decrease with the warming of Zoige Plateau peatlands.


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更新日期/Last Update: 2016-02-25