Effects of N sources and methane concentrations on methane uptake potential of a typical coniferous forest and its adjacent orchard soil
Effects of N sources and methane concentrations on methane uptake potential of a typical coniferous forest and its adjacent orchard soil
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DOI：
10.1007/s00374-004-0768-9
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发表时间：
2004-08
影响因子：
6.5
通讯作者：
Xingkai Xu;K. Inubushi
中科院分区：
文献类型：
--
作者：
Xingkai Xu;K. Inubushi
去除地上植物残体后，从日本沼田市典型的针叶林及其邻近的果园中采集了三种不同的土壤层。在室内好氧条件下，研究了两种初始CH 4浓度下土壤吸收CH 4的潜力，并沿着了尿素氮和硝酸钾氮对土壤CH 4氧化的抑制作用。在2.4和12.6 μl l− 1CH 4浓度下，由于长期的N输入，果园土壤上层矿质层的CH 4吸收量分别比表层森林土壤低25.4%和87.7%。在两个CH 4水平下，森林土壤的甲烷吸收量随土壤深度的增加而降低。然而，在12.6 μl l− 1甲烷浓度下，果园土壤中9- 23 cm深处的CH 4消耗活性最大。以200 μg N g− 1 soil的速率以KNO 3或尿素形式添加的氮显著降低了两个地点的上部和次表层矿物层的土壤CH 4吸收，除了添加KNO 3-N对果园土壤9- 23-cm深度的CH 4吸收没有明显的抑制作用。与NH 4+相比，NO3−对CH 4吸收有很强的抑制作用，发生在表层森林土壤中。与尿素或尿素加硝化抑制剂（双氰胺）相比，KNO 3-N的使用导致果园土壤0- 23-cm深处CH 4氧化抑制的可能性较低。
After removal of the above-ground plant debris three different soil layers were taken from a typical coniferous forest and its adjacent orchard in Numata City, Japan. The potentials of soil CH4uptake at two initial CH4concentrations were studied under aerobic conditions in the laboratory, along with inhibition of soil CH4oxidation by urea-N or KNO3-N addition. Due to long-term N inputs, the CH4uptake of the upper mineral layer of the orchard soil was 25.4% and 87.7% lower than that of the surface forest soil at 2.4 and 12.6 μl l−1CH4, respectively. Methane uptake of the forest soil decreased with increasing soil depths at two CH4levels. However, maximal CH4-consuming activity occurred in the 9- to 23-cm depth of the orchard soil at 12.6 μl l−1methane. Nitrogen additions in the form of KNO3or urea at the rate of 200 μg N g−1soil substantially reduced soil CH4uptake in the upper and sub-surface mineral layers at both sites, except that the addition of KNO3-N had no apparent inhibitory effect on the CH4uptake in the 9- to 23-cm depth of the orchard soil. A strong inhibitory effect of NO3−addition on the CH4uptake, in contrast to NH4+, occurred in the surface forest soil. The use of KNO3-N, as compared to urea or urea plus a nitrification inhibitor (dicyandiamide), resulted in a lower potential to cause inhibition of CH4oxidation in the 0- to 23-cm depth of the orchard soil.