Shallow-incorporated straw returning further improves rainfed maize productivity, profitability and soil carbon turnover on the basis of plastic film mulching
文献类型： 外文期刊
作者： Cheruiyot, Wesly Kiprotich 1 ; Zhu, Shuang-Guo 1 ; Indoshi, Sylvia Ngaira 1 ; Wang, Wei 1 ; Ren, Ai-Tian 1 ; Cheng, Zheng-Guo 1 ; Zhao, Ze-Ying 1 ; Zhang, Jin-Lin 1 ; Lu, Jun-Sheng 1 ; Zhang, Xu-Cheng 2 ; Munyasya, Alex Ndolo 1 ; Zhao, Ling 1 ; Koskei, Kiprotich 1 ; Ma, Ming-Sheng 2 ; Mburu, David Mwehia 3 ; Nyende, Aggrey Bernard 3 ; Xiong, You-Cai 1 ;
作者机构： 1.Lanzhou Univ, Coll Ecol, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou 730000, Peoples R China
2.Gansu Acad Agr Sci, Inst Dryland Farming, Dingxi Res Stn, Lanzhou 730070, Peoples R China
3.Jomo Kenyatta Univ Agr & Technol, Coll Agr & Nat Resources, POB 62000, Nairobi 00200, Kenya
关键词： Ridge-furrow plastic-mulching (RFM); Maize stover returning; Soil hydrothermal condition; Soil organic carbon turnover; Net primary productivity
期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.7； 五年影响因子：6.6 ）
ISSN： 0378-3774
年卷期： 2023 年 289 卷
页码：
收录情况： SCI
摘要： Ridge and furrow plastic film mulching (RFM) has improved net primary productivity (NPP) to a high level in semi-arid rainfed agricultural regions. Yet, it is unclear whether there is still a room for further improvement on NPP while stabilizing soil organic carbon through returning previous maize stover pieces. To address this issue, maize stubbles were smashed into pieces and in situ ploughed into 30 cm topsoil at a semi-arid site in northwest China from 2016 to 2017. This was done using the Pioneer 335 maize variety with three treatments (CK, ridge and furrow without mulching; RFM, ridge and furrow with plastic mulching; RFML, 3.49 t ha(-1) of maize stover returning in RFM; RFMH, 5.24 t ha(-1) of returning in RFM). The results indicated that maize stover returning exhibited similar trend as RFM at early cool seedling stage, raising the topsoil temperature. However, in warm and dry silking stage (2017), both stover returning rates reduced soil temperatures by 1.33 and 0.8 C-degrees relative to RFM and CK (P < 0.05), respectively. The soil water storage increased significantly in RFMH by 17.3% and RFML by 28.5% relative to that of RFM, in a warm and dry growing season (2017). Critically, stover returning increased (P < 0.05) soil organic carbon and light fraction organic carbon turnover across the two growing seasons. By improving hydrothermal conditions, stover returning in RFM increased biomass accumulation and grain yield (P < 0.05), leading to higher (P < 0.05) net economic benefit, with greater above-ground biomass NPP (74.5-93.2%) and below-ground biomass NPP (88.5-89.4%), compared with CK. In conclusion, maize stover returning of stover pieces into topsoil might be a promising solution to enhance carbon turnover for higher net primary productivity on the basis of plastic film mulching in semiarid rainfed region.
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