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Cultivation, nitrogen fertilization, and set‐aside effects on methane uptake in a drained marsh soil in Northeast China
Author(s) -
Ding Weixin,
Cai Zucong,
Tsuruta Haruo
Publication year - 2004
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1111/j.1365-2486.2004.00843.x
Subject(s) - soil water , agronomy , marsh , sanjiang plain , environmental science , nitrogen , fertilizer , soil ph , chemistry , soil science , biology , ecology , wetland , organic chemistry
To evaluate the effect of cultivation, nitrogen fertilizer, and set aside on CH 4 uptake after drained marshland was converted into agricultural fields, CH 4 fluxes and CH 4 concentrations in soil gas were in situ measured in a drained marsh soil, a set‐aside cultivated soil, and cultivated soils in Sanjiang Plain of Northeast China in August 2001. Over the measuring period, the highest CH 4 uptake rate was 120.7±6.2 μg CH 4 m −2 h −1 in the drained marsh soil and the lowest was 29.5±4.9 μg CH 4 m −2 h −1 in the set‐aside cultivated soil, showing that there was no significant recovery of CH 4 uptake ability 5 years after cultivation activity was stopped. CH 4 uptake rates were significantly less in the cultivated soils than in the drained marsh soil by 30.1–74.6%, which resulted mainly from cultivation and partly from nitrogen addition. A significantly negative correlation between CH 4 flux and bulk density in the cultivated soils tilled by machine suggests that cultivation reduced CH 4 uptake through compaction, because of the enhanced diffusion resistance for CH 4 and O 2 . Nitrogen fertilization slowly reduced but persistently affected CH 4 uptake even after long‐term application of nitrogen.