Effect of conservation tillage on crop yield and soil organic carbon in Northeast China: A meta-analysis

文献类型： 外文期刊

第一作者： He, Cong

作者： He, Cong;Niu, Jia-Rui;Xu, Cheng-Tang;Han, Shou-Wei;Zhang, Hai-Lin;Bai, Wei;Song, Qiu-Lai;Dang, Yash Pal

作者机构：

关键词： conservation tillage; crop yield; Northeast China; SOC sequestration; soil degradation; synthesis analysis

期刊名称：SOIL USE AND MANAGEMENT （ 影响因子：3.672； 五年影响因子：3.314 ）

ISSN： 0266-0032

年卷期： 2022 年 38 卷 2 期

页码：

收录情况： SCI

摘要： Northeast China, the important grain-producing region in China, is under threat from soil degradation because of long-term conventional tillage (CT). The adoption of conservation tillage is anticipated to restore soil fertility, maintain crop yields and enhance sustainability. However, the integrated effects of conservation tillage practice on crop yields and soil organic carbon (SOC) remain unclear. In this meta-analysis of peer-reviewed studies conducted in the Northeast China region, we assess crop yields and SOC values under no-till, ridge tillage and subsoiling tillage practices. The results indicate that in areas with mean annual temperatures (MAT) below 3 degrees C, crop yields were significantly (p < .05) higher under ridge tillage (0.8%) and subsoiling tillage (13.1%) compared with CT, whereas yields reduced under no-till (-3.7%). Ridge tillage generally had a similar effect on crop yield as no-till, without the negative impact in colder regions. We also report that no-till practice increased SOC concentrations by 24.1%, 43.9% and 17.4% in areas of higher temperature (MAT > 6 degrees C), low mean annual precipitation (MAP) (<500 mm) and continuous cropping conditions, respectively. Ridge tillage and subsoiling tillage also had positive effects on SOC concentrations (to a lesser degree than no-till), indicating that conservation tillage can enhance SOC in Northeast China. Overall, the implementation of different conservation tillage measures in Northeast China was found to enhance crop yields and sequester carbon. We recommend that ridge tillage is used in colder areas and that subsoiling tillage is used in rotation with other tillage measures to maintain crop yields.

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