Effects of organic matter incorporation on nitrous oxide.pdfVIP

Plant Soil (2010) 327:315–330 DOI 10.1007/s11104-009-0056-4 REGULAR ARTICLE Effects of organic matter incorporation on nitrous oxide emissions from rice-wheat rotation ecosystems in China Zhisheng Yao Zaixing Zhou Xunhua Zheng Baohua Xie Baoling Mei Rui Wang Klaus Butterbach-Bahl Jianguo Zhu Received: 2 March 2009 /Accepted: 27 May 2009 /Published online: 6 June 2009 # Springer Science + Business Media B.V. 2009 Abstract Organic matter addition is thought to be methods. Our data show that N2 O emissions an important regulator of nitrous oxide (N2O) throughout the rice season from plots treated with emissions from croplands. Contradictory effects, wheat straw application at a high rate (WS) prior to however, were reported in previous studies. To rice transplanting (1.1–2.0 kg N ha− 1) were signif- investigate the effects of crop residue management icantly lower (P 0.05) than those from the control on N2O emissions from rice-wheat rotation ecosys- plots without organic matter addition or added with tems, we conducted field experiments at three sites wheat straw at a moderate rate (1.6–2.9 kg N ha− 1). (Suzhou, Wuxi and Jiangdu) in the Yangtze River Furthermore, the WS treatments had a residual inhibi- Delta, using static chamber and gas chromatography tory effect on N2O emissions in the following non-rice season, which consistently resulted in significantly lower emissions (P 0.05) compared to the control treatments (2.2–3.1 vs. 3.9–5.6 kg N ha− 1). In