Methane flux in non-wetland soils in response to nitrogen addition: a meta-analysis
Methane flux in non-wetland soils in response to nitrogen addition: a meta-analysis
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DOI：
10.1890/09-2185.1
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发表时间：
2010-11-01
期刊：
影响因子：
4.8
通讯作者：
Helliker, B. R.
中科院分区：
文献类型：
--
作者：
Aronson, E. L.;Helliker, B. R.
土壤中甲烷（CH 4）的进出通量的控制还不清楚。环境变量，包括温度，降水和氮（N）的状态可以有强烈的影响的大小和方向（e。例如，在一个实施例中，吸收与释放）的CH 4通量。为了更好地了解CH 4循环微生物和N在非湿地土壤系统之间的相互作用，进行荟萃分析发表的文献比较CH 4通量在N修正和匹配的控制地块。为此目的，开发了一个适当的研究索引。结果发现，少量的N往往刺激CH 4吸收，而大量的往往抑制吸收的土壤。当考虑所有其他变量时，转换发生在100 kg N.ha（-1）.yr（-1）。管理的土地和土地施肥时间较长，表现出更大的抑制CH 4吸收与添加N。这些结果支持的假设，大量的有效氮可以抑制甲烷氧化，但也甲烷氧化菌在高地土壤中可以限制在其消费的CH 4从大气中的N。有其他变量和N除了对CH 4通量响应之间的相互作用：较低的温度，并在较小程度上，较高的降水量放大了抑制CH 4吸收由于N除了。几种机制，可能会导致这些趋势进行了讨论，但没有一个可以得到最终支持这种方法。应开展进一步的控制和现场研究，以分离出正确的机制，并建立高地CH 4通量模型。
The controls on methane (CH4) flux into and out of soils are not well understood. Environmental variables including temperature, precipitation, and nitrogen (N) status can have strong effects on the magnitude and direction (e. g., uptake vs. release) of CH4 flux. To better understand the interactions between CH4-cycling microorganisms and N in the non-wetland soil system, a meta-analysis was performed on published literature comparing CH4 flux in N amended and matched control plots. An appropriate study index was developed for this purpose. It was found that smaller amounts of N tended to stimulate CH4 uptake while larger amounts tended to inhibit uptake by the soil. When all other variables were accounted for, the switch occurred at 100 kg N.ha(-1).yr(-1). Managed land and land with a longer duration of fertilization showed greater inhibition of CH4 uptake with added N. These results support the hypotheses that large amounts of available N can inhibit methanotrophy, but also that methanotrophs in upland soils can be N limited in their consumption of CH4 from the atmosphere. There were interactions between other variables and N addition on the CH4 flux response: lower temperature and, to a lesser extent, higher precipitation magnified the inhibition of CH4 uptake due to N addition. Several mechanisms that may cause these trends are discussed, but none could be conclusively supported with this approach. Further controlled and in situ study should be undertaken to isolate the correct mechanism(s) responsible and to model upland CH4 flux.