水保所知识产出(1956---)知识库

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CH 4 -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 CH 4 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 CH 4 emission; the effects of dissolved organic carbon (DOC)
and microbe biomass carbon (MBC) on CH 4 emission were also determined. The results showed that enhanced temperature
decreased CH 4  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, CH 4
emission was increased at the surface but decreased at deeper layers. We also found that DOC had negative effect on CH 4
emi ssion at 8 °C but no effect at 18 °C, which should be correlated to the origin of DOC. MBC had a negative effect on CH 4
emission. Based on the results, we can conclude that CH 4 emission may decrease with the warming of Zoige Plateau peatlands.