Effects of different tillage systems and cropping sequences on soil physicochemical properties and greenhouse gas emissions
Effects of different tillage systems and cropping sequences on soil physicochemical properties and greenhouse gas emissions
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DOI：
10.1016/j.agee.2022.108010
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
A. L. Virk;Wen-Sheng Liu;Zhe Chen;Yves N´Dri Bohoussou;M. Cheema;K. S. Khan;Xin Zhao;Hailin Zhang
中科院分区：
文献类型：
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作者：
A. L. Virk;Wen-Sheng Liu;Zhe Chen;Yves N´Dri Bohoussou;M. Cheema;K. S. Khan;Xin Zhao;Hailin Zhang
温室气体排放是导致气候变化的主要因素，而农田是温室气体排放的主要来源，受土壤理化性质的影响。免耕（NT）和轮作（CSs）等田间管理措施可以通过改变土壤理化性质来调节温室气体排放。为了解不同耕作方式和CSs下土壤理化性质对温室气体排放的影响，在2019年和2020年进行了两种耕作方式（NT和RT）和CSs（玉米-小麦-大豆-小麦（MWS）、大豆-小麦-玉米-小麦（SWM）、小麦-大豆（SW）和小麦-玉米（WM））的田间试验。结果表明，与其他CSs相比，2019年N2O排放量较高，主要是在SWM和SW下。RT下N2O累积排放量（28.89%（2019）和37.94%（2020)）高于NT， RT在2019年和2020年的ch4汇（20.93%）和19.6%）高于NT，并且2020年ch4吸收量比2019年增加了近91.49%。这些年际变化主要是由降水年际异常引起的充水孔隙空间（WFPS）引起的，其中2019年的高降水（79.91%）比2020年增加了约50.71%的WFPS。全球变暖潜势（GWP）与TN、PON、SOC、POC和SOC储量呈负相关，与WFPS呈正相关。这些结果表明，RT对不同CSs的WFPS、SOC、TN及其相关组分具有负向影响，并能提高GWP。综上所述，不同碳水化合物组合的NT可为降低全球升温潜能值和提高玉米当量产量提供解决方案。
The greenhouse gas emissions (GHGE) are major contributor to climate change and farmlands are prominent source of GHGE that are affected by soil chemical and physical properties. Field management practices e.g. no-till (NT) and cropping sequences (CSs) can regulate GHGE by changing soil physicochemical properties. To understand the role of soil physicochemical properties on GHGE under different tillage and CSs, a field experiment was conducted during 2019 and 2020 consisting of two tillage systems (NT and rotary tillage (RT)) and CSs (maize-wheat-soybean-wheat (MWS), soybean-wheat-maize-wheat (SWM), wheat-soybean (SW) and wheat-maize (WM)). The results showed that N2O emissions were higher in 2019, mainly under SWM and SW as compared to other CSs. Higher cumulative N2O emissions (28.89% (2019) and 37.94% (2020)) under RT were observed than NT. RT had higher CH4sink in 2019 (20.93%) and 2020 (19.6%) in comparison to NT. Moreover, CH4uptake was increased almost 91.49% in 2020 as compared to 2019. These inter-annual changes between GHGE were mainly due to water filled pore spaces (WFPS) induced by inter-annual precipitation anomalies, where higher precipitation (79.91%) in 2019 increased about 50.71% WFPS as compared to 2020. The global warming potential (GWP) was negatively correlated to TN, PON, SOC, POC and SOC stock, but positively correlated to WFPS. These results suggested that RT could negatively impact WFPS, SOC, TN and their associated fractions in different CSs and enhance GWP. In conclusion, NT with diversified CSs could offer a solution for decreasing GWP and improving maize equivalent yield.