Plateau Marsh Methane Oxidation as affected by Inorganic NEnglish Full Text

WANG Zhi-Ping, DUAN Yi, YANG Ju-Rong, LI Ling-Hao and HAN Xing-Guo Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China). E-mail: wangzp5@yahoo.com State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000 (China) College of Resource and Environment, Beijing Normal University, Beijing 100875 (China)

Abstract: In a series of laboratory incubations using soils of two contrasting sites from a temperate marsh on the Qinghai-Tibet Plateau, potential methane （CH4） oxidation rates were measured to study the effects of inorganic N inputs on CH4 oxidation. For a drained site, subsurface peat （5-15 cm） at an initial 20 μL CH4 L-1 showed a significantly different （P ＜ 0.05） CH4 oxidation rate compared to other soil depths, with a maximal rate of 20.9 ng CH4 gDW （dry weight）-1 h-1; the underlying mineral soil layers （15-30 and 30-50 cm） also had a strong CH4 oxidation capacity at about an initial 2000 μL CH4 L-1. With a waterlogged site, the CH4 oxidation rate in an aerobic incubation was significantly greater （P ＜ 0.05） in the surface soil layer （0-5 cm） compared to the 15-30 and 30-50 cm depths. There was generally no or a very weak effect from addition of NO3- on CH4 oxidation. In marked contrast, NH4+ salts, such as （NH4）2SO4, NH4Cl and NH4NO3, exhibited strong inhibitions, which varied as a function of the added salts and the initial CH4 level. Increasing NH4+ usually resulted in greater inhibition and increasing initial CH4 concentrations resulted in less. NH4+ inhibition on CH4 oxidatio in natural high-altitude, low-latitude wetlands could be as important as has been reported for agricultural and forest soils. The NH4+ effects on the CH4 oxidation rate need to be further investigated in a wide range of natural wetland soil types.

Keywords：

ammonium; inhibition; inorganic N; methane oxidation; plateau marsh;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

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