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Effects of different tillage systems and cropping sequences on soil physicochemical properties and greenhouse gas emissions
Agriculture, Ecosystems & Environment ( IF 6.6 ) Pub Date : 2022-05-16 , DOI: 10.1016/j.agee.2022.108010
Ahmad Latif Virk, Wen-Sheng Liu, Zhe Chen, Yves N´Dri Bohoussou, Mumtaz Akhtar Cheema, Khuram Shehzad Khan, Xin Zhao, Hai-Lin Zhang

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 CH4 sink in 2019 (20.93%) and 2020 (19.6%) in comparison to NT. Moreover, CH4 uptake 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.



中文翻译:

不同耕作制度和耕作顺序对土壤理化性质和温室气体排放的影响

温室气体排放(GHGE)是气候变化的主要贡献者,农田是受土壤化学和物理特性影响的温室气体的主要来源。免耕 (NT) 和种植顺序 (CSs) 等田间管理实践可以通过改变土壤理化性质来调节 GHGE。为了了解不同耕作和 CSs 下土壤理化性质对 GHGE 的作用,在 2019 年和 2020 年期间进行了一项田间试验,包括两种耕作系统(NT 和旋耕(RT))和 CSs(玉米-小麦-大豆-小麦(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))。结果表明,与其他 CS 相比,2019 年N 2 O 排放量较高,主要是在 SWM 和 SW 下。更高的累积 N 2在 RT 下观察到的 O 排放(28.89%(2019 年)和 37.94%(2020 年))比 NT 高。与 NT 相比,RT 在 2019 年(20.93%)和 2020 年(19.6%)具有更高的 CH 4汇。此外,CH 4与 2019 年相比,2020 年的吸收量增加了近 91.49%。GHGE 之间的这些年际变化主要是由于年际降水异常引起的充水孔隙空间 (WFPS),其中 2019 年的较高降水量 (79.91%) 增加了约与 2020 年相比,WFPS 为 50.71%。全球变暖潜能值 (GWP) 与 TN、PON、SOC、POC 和 SOC 存量呈负相关,但与 WFPS 呈正相关。这些结果表明,RT 可能对不同 CS 中的 WFPS、SOC、TN 及其相关部分产生负面影响,并增强 GWP。总之,具有多样化 CS 的 NT 可以为降低 GWP 和提高玉米当量产量提供解决方案。

更新日期:2022-05-17
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