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The impacts of ditch-buried straw layers on the interface soil physicochemical and microbial properties in a rice-wheat rotation system

文献类型： 外文期刊

作者： Yang, Haishui 1 ; Xu, Mingmin 1 ; Li, Yifan 1 ; Xu, Chaofan 1 ; Zhai, Silong 1 ; Liu, Jian 3 ;

作者机构： 1.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China

2.Nanjing Agr Univ, Jiangsu Collaborat Innovat Ctr Modern Crop Prod, Nanjing 210095, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Sci Yanjiang Dist Jiangsu Prov, Rugao 226500, Peoples R China

关键词： Straw incorporation; Soil temperature; Soil structure; Nitrogen availability; Soil microbial community

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

ISSN： 0167-1987

年卷期： 2020 年 202 卷

页码：

收录情况： SCI

摘要： Ditch-buried straw return (DB-SR) is a novel soil tillage and fertility-building practice, which may allow for the formation of a straw layer structure in rice-wheat rotation systems. However, it is presently unknown how the straw layer affects soil physicochemical and microbial processes in the interface between straw layer and bulk soils. Thus, we conducted a field experiment from 2008 to 2014 to determine whether there were changes in soil structure, temperature, available nitrogen, and microbial properties in the soil layer close to the straw layers (+/- 5 cm). Three treatments were included: control with no-till and straw removal (CK), ditch-buried straw return to a depth of 20 cm (DB-SR-20), and ditch-buried straw return to a depth of 40 cm (DB-SR-40). Our results showed that soil macroaggregate formation was increased with the duration of straw return in the soils 5 cm below the straw layers under DB-SR-20 and above the straw layers under DB-SR-40. The straw layers could significantly increase soil temperature below the straw layers, but a larger increase was observed for DB-SR-40 than DB-SR-20. We also found that DB-SR-20 largely increased the NH4+ concentration in both the soil layers above and below the straw layers, but DB-SR-40 only increased NO3- in the soils above the straw layers. In addition, the catabolic profile of soil microbial communities was largely affected by the straw layers, but the effects decreased with the duration of the treatment. These findings suggest that the straw layer largely alters the spatio-temporal processes of physicochemical and microbial properties in the interface soils after long-term implementation of ditch-buried straw return. Some of the positive alterations may cascade to facilitate crop growth and enhance the productivity of rice-wheat rotation systems.

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