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An integrated straw-tillage management increases maize crop productivity, soil organic carbon, and net ecosystem carbon budget

文献类型： 外文期刊

作者： Zhang, Wushuai 1 ; Li, Hong 4 ; Liang, Lanyue 1 ; Wang, Sixian 1 ; Lakshmanan, Prakash 3 ; Jiang, Zhicheng 4 ; Liu, Chunying 4 ; Yang, Hua 4 ; Zhou, Maolin 4 ; Chen, Xinping 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Chongqing 400715, Peoples R China

2.Southwest Univ, Acad Agr Sci, Chongqing 400715, Peoples R China

3.Southwest Univ, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing 400715, Peoples R China

4.Chongqing Acad Agr Sci, Maize Res Inst, Chongqing 401329, Peoples R China

5.Guangxi Acad Agr Sci, Sugarcane Res Inst, Nanning 530007, Peoples R China

6.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld 4067, Australia

关键词： Conservation agriculture; Greenhouse gas emission; Carbon footprint; Soil organic carbon storage; Carbon balance

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.576； 五年影响因子：7.088 ）

ISSN： 0167-8809

年卷期： 2022 年 340 卷

页码：

收录情况： SCI

摘要： Soil carbon sequestration is widely considered to improve soil quality, safeguard food security, and mitigate climate change. However, the effect of best management practices like conservation tillage on soil carbon sequestration remains unclear. A 3-year field experiment was conducted to explore the effect of integrated straw -tillage systems (conventional rotary tillage, CT; no-tillage, NT; CT with straw retention, CT-SR; NT with straw retention, NT-SR) on maize productivity, soil organic carbon (SOC), and net ecosystem carbon budget (NECB) in Southwest China. The results indicate that the CT-SR achieved the highest grain yield (9.1 Mg ha(-1)) and aboveground biomass (19.0 Mg ha(-1)). Averaged grain yield and aboveground biomass of the two systems without straw retention, CT and NT, were, respectively, 4.5 % and 4.1 % lower than those with straw retention. The NT -SR and CT-SR achieved the highest SOC concentration, 12.3 g kg(-1) and 11.9 g kg(-1), respectively, as well as the highest SOC stock and the annual increase in SOC and SOC stock. The highest NECB was observed in NT-SR, which was not significantly different from those of CT-SR and CT, but was higher than that of NT by 13.1 %. Higher SOC sequestration was the major contributor to the NECB of NT-SR, while higher gross primary productivity and harvest carbon removal contributed mostly to NECB of CT-SR and CT. A combination of straw retention and NT was more positive than that with CT for the continued rise in SOC sequestration. The NT system was inferior to others for improving the system productivity and NECB, especially when comparing with CT-SR. In summary, the integrated straw retention and rotary tillage (CT-SR) achieved the highest system productivity, while the NT-SR was superior for SOC sequestration and NECB than other systems for maize production in the Southwest China. An integrated straw-tillage management is therefore an efficient and feasible way to maintain high maize productivity and carbon sustainability.

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