数字农科院2.0

Continuous Co-incorporation of Chinese Milk Vetch and Rice Straw with Reduced Chemical Fertilizer Maintains Rice Yield as a Consequence of Increased Carbon and Nitrogen Storage in Soil Aggregates

文献类型： 外文期刊

作者： Bu, Rongyan;Cheng, Wenlong;Han, Shang;Hu, Run;Wang, Hui;Tang, Shan;Li, Min;Zhu, Qin;Wu, Ji;Cao, Weidong

作者机构：

关键词： Green manure cultivation;Rice straw return;Rice productivity;Soil aggregates;Nitrogen storage;Carbon storage

期刊名称： JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION

ISSN： 0718-9508

年卷期： 2023 年

页码：

收录情况： SCIE（2023版）

摘要： Despite increasing application of Chinese milk vetch (MV) and rice straw (RS), their combined effects on soil aggregate structure and nutrient storage are poorly understood. A field experiment was conducted to evaluate the effects of co-incorporation of MV and RS on rice yield and soil fertility. Five different fertilization regimes were adopted over a 3-year period. Chemical nitrogen (N) fertilizer was applied at a conventional rate (100%N) and a 40% reduced rate alone (60%N) or combined with MV (60%NMV), RS (60%NRS), and MV plus RS (60%NMVRS). Compared with the 100%N treatment, there were no distinct yield losses in the 60%NMV and 60%NMVRS treatments. Incorporation of organic amendments altered the composition of soil aggregates, as indicated by the increase of large (> 2 mm) and small (0.25-2 mm) macroaggregates and decrease of silt and clay (< 0.053 mm). The organic carbon and nitrogen storage were respectively decreased by 9.2% and 13.9% in the 60%N treatment, and this effect was diminished in the 60%NMVRS treatment, rather than the 60%NMV or 60%NRS treatment. The carbon and nitrogen storage in soil macroaggregates increased in response to organic amendments, and their peak values were observed in the 60%NMVRS treatment. Random forest analysis identified carbon and nitrogen storage in soil macroaggregates as the major contributors to rice yield. Continuous co-incorporation of Chinese milk vetch and rice straw maintained rice productivity with reduced nitrogen application as a consequence of improved soil aggregation (> 0.25 mm), increased carbon and nitrogen storage in macroaggregates, and enhanced nutrient availability.

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