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Carbon sequestration effects of rice straw return in double season paddy field in Southern China.

Authors :
Wu Jia-mei
Ji Xiong-hui
Peng Hua
Shi Li-hong
Liu Zhao-bing
Tian Fa-xiang1,3
Huo Lian-jie
Zhu Jian
Source :
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao; Dec2011, Vol. 22 Issue 12, p3196-3202, 7p, 4 Charts, 2 Graphs
Publication Year :
2011

Abstract

In a long term sitespecific experiment with rice straw return (RSR) and in a short term experiment with different RSR modes, this paper studied the effects of RSR on the soil organic car bon (SOC) sequestration, methane emission, and net carbon sink in a double season paddy field. RSR increased the SOC content, and the annual increasing rate of soil carbon sink in plow layer (0-15 cm) under long term RSR was 0.07 t C · hm<superscript>-2</superscript> · a<superscript>-1</superscript>. With the increasing amount of RSR, the apparent SOC transformation rate decreased. RSR promoted the methane emission from the pad dy field significantly, and the methane emission flux in treatment RSR plus NPK during earlyand late rice growth seasons increased by 75. 0% and 251. 5% (P <0. 01), respectively, compared with that in treatment NPK. The methane emission increased with the increasing amount of RSR. Under the similar tillage mode and rice yield, the rice straw returned had the similar apparent methane transformation rate. Considering the soil carbon sequestration and the net carbon sink after methane emission in the paddy field comprehensively, treatment RSR plus NPK had significant negative effect on the carbon sink which was basically approached to the biofixation of carbon by rice and increased by 158.3%, as compared with treatment NPK. Among different RSR modes, rice straw mulching plus no tillage decreased soil methane emission significantly, with the net carbon sink decreased by 50. 9% as compared with the treatment high stubble plus tillage, and benefited the high and stable yielding of rice. [ABSTRACT FROM AUTHOR]

Details

Language :
Chinese
ISSN :
10019332
Volume :
22
Issue :
12
Database :
Supplemental Index
Journal :
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao
Publication Type :
Academic Journal
Accession number :
70694568