首页|Synergistic Effects of Nitrogen Amendments and Ethylene on Atmospheric Methane Uptake under a Temperate Old-growth Forest

Synergistic Effects of Nitrogen Amendments and Ethylene on Atmospheric Methane Uptake under a Temperate Old-growth Forest

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An increase in atmospheric nitrogen (N) deposition can promote soil acidification, which may increase the release of ethylene (C2H4) under forest floors. Unfortunately, knowledge of whether increasing N deposition and C2H4 releases have synergistic effects on soil methane (CH4) uptake is limited and certainly deserves to be examined. We conducted some field measurements and laboratory experiments to examine this issue. The addition of (NH4)2SO4 or NH4C1 at a rate of 45 kg N ha-1 yr 1 reduced the soil CH4 uptake under a temperate old-growth forest in northeast China, and there were synergistic effects of N amnendments in the presence of C2H4 concentrations equal to atmospheric CH4 concentration on the soil CH4 uptake, particularly in the NH4Cl-treated plots. Effective concentrations of added C2H4 on the soil CH4 uptake were smaller in NH4+-treated plots than in KNO3-treated plots. The concentration of ca 0.3 μ1 C2H4 L-1 in the headspace gases reduced by 20％ soil atmospheric CH4 uptake in the NH4Cl-treated plots, and this concentration was easily produced in temperate forest topsoils under short-term anoxic conditions. Together with short-term stimulating effects of N amendments and soil acidification on C2H4 production from forest soils, our observations suggest that knowledge of synergistic effects of NH4+, rather than NO3-, amendments and C2H4 on the in situ soil CH4 uptake is critical for understanding the role of atmospheric N deposition and cycling of C2H4 under forest floors in reducing global atmospheric CH4 uptake by forests. Synergistic functions of NH4+-N deposition and C2H4 release due to soil acidification in reducing atmospheric CH4 uptake by forests are discussed.

methane uptake, ethylene, nitrogen amendment, synergistic effect, forest

XU Xingkai、HAN Lin、LUO Xianbao、HAN Shijie

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State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029

Graduate University of Chinese Academy of Sciences,Beijing 100049

Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016

国家自然科学基金国家自然科学基金国家自然科学基金Key Project of Knowledge Innovation Program from the Chinese Academy of SciencesHundred Talents Project from the Chinese Academy of Sciences

410210042077707120477044KZCX2-YW-432

2011

10.1007/s00376-010-0071-7

大气科学进展(英文版)
中国科学院大气物理研究所

大气科学进展(英文版)

CSTPCDCSCDSCI
影响因子：0.741
ISSN：0256-1530
年,卷(期)：2011.28(4)
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