Effects of crop residue returning on nitrous oxide emissions in agricultural soils
Effects of crop residue returning on nitrous oxide emissions in agricultural soils
复制标题
农作物秸秆还田对农业土壤氧化亚氮排放的影响
DOI：
10.1016/j.atmosenv.2013.02.009
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发表时间：
2013-06-01
影响因子：
5
通讯作者：
Yan, Xiaoyuan
中科院分区：
文献类型：
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作者：
Shan, Jun;Yan, Xiaoyuan
秸秆还田是农业系统中的一种常见做法，其对氧化亚氮（N2 O）排放的影响是不可忽视的。农作物秸秆对N2 O释放的影响一直是人们关注的焦点。然而，由于不同研究中的环境因素不尽相同，尚未得出系统的结果。本研究采用荟萃分析方法对112项作物秸秆还田对N2 O排放的科学评估进行了整合。结果表明，作物秸秆还田，平均在所有研究中，与对照处理相比，N2 O的释放没有统计学上显着的影响。然而，作物秸秆还田对N2 O排放的影响范围显着影响合成氮肥（N）的应用，作物秸秆的类型，具体的方式，作物秸秆还田，土地利用类型。秸秆配施氮肥和土地利用方式为水田时，N2 O释放量分别被抑制了11.7%和27.1%（P < 0.05）。单施秸秆还田和旱地利用方式使N2 O排放量分别增加了42.1%和23.5%（P < 0.05）。当使用具有较低C/N比的作物残体、进行作物残体覆盖和土地利用类型为休闲时，N2 O排放同样增加。本研究首次定量分析了秸秆还田对N2 O排放的影响，表明秸秆还田在区域尺度上对N2 O排放没有统计学显著影响，并强调政府间气候变化专门委员会指南在估算不同土地的作物残留物N2 O排放系数时，应考虑到作物残留物还田对高地和稻田的相反影响，使用类型。鉴于大多数数据主要是由某些类型的作物残留物和特定的应用方法，需要更多的实地数据，以减少不确定性。(C)2013爱思唯尔有限公司保留所有权利。
Crop residue returning is a common practice in agricultural system that consequently influences nitrous oxide (N2O) emissions. Much attention has been focused on the effects of crop residue on N2O release. However, no systematic result has yet been drawn because environmental factors among different studies vary. A meta-analysis was described to integrate 112 scientific assessments of crop residue returning on N2O emissions in this study. Results showed that crop residue returning, when averaged across all studies, had no statistically significant effect on N2O release compared with control treatments. However, the range of effects of crop residue returning on N2O emission was significantly affected by synthetic nitrogen (N) fertilizer application, type of crop residue, specific manner in which crop residue has returned, and type of land-use. N2O release was significantly inhibited by 11.7% and 27.1% (P < 0.05) when crop residue was with synthetic N fertilizer and when type of land-use was paddy, respectively. While N2O emissions were significantly enhanced by 42.1% and 23.5% (P < 0.05) when crop residue was applied alone and when type of land-use was upland, respectively. N2O emissions were likewise increased when crop residue with lower C/N ratio was used, mulching of crop residue was performed, and type of land-use was fallow. Our study provides the first quantitative analysis of crop residue returning on N2O emissions, indicating that crop residue returning has no statistically significant effect on N2O release at regional scale, and underlining that the Intergovernmental Panel on Climate Change guidelines should take the opposite effects of crop residue returning on upland and paddy into account when estimating the N2O emission factor of crop residue for different land-use types. Given that most of data are dominated by certain types of crop residue and specific application methods, more field data are required to reduce uncertainty. (C) 2013 Elsevier Ltd. All rights reserved.