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Long-term ditch-buried straw return alters soil carbon sequestration, nitrogen availability and grain production in a rice-wheat rotation system

文献类型： 外文期刊

作者： Zhai, Silong 1 ; Xu, Chaofan 1 ; Wu, Yongcheng 1 ; Liu, Jian 2 ; Meng, Yali 3 ; Yang, Haishui 1 ;

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

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

3.Nanjing Agr Univ, Coll Agr, Collaborat Innovat Ctr Modern Crop Prod, Nanjing 210095, Peoples R China

关键词： China; straw return; soil nitrogen availability; soil carbon pool; yield; rice wheat double cropping

期刊名称：CROP & PASTURE SCIENCE （ 影响因子：1.57； 五年影响因子：1.792 ）

ISSN： 1836-0947

年卷期： 2021 年 72 卷 4 期

页码：

收录情况： SCI

摘要： Our previous studies indicated that ditch-buried straw return (DB-SR) can improve soil processes in the short term, i.e. increasing microbial metabolic capability, reducing nitrogen leaching loss and promoting soil aggregation. However, it remains unclear how long-term implementation of DB-SR affects soil carbon (C) and nitrogen (N) processes and crop yields. Here, the effects of DB-SR on soil C pool and N availability as well as grain yields were investigated after consecutive application of 6 (rice season) and 6.5 years (wheat season). We found that long-term DB-SR significantly increased rice yields, total organic C, NH4+ and NO3- in the rice soils, as well as enhanced wheat yields, microbial biomass C, microbial biomass N, microbial biomass C/total organic C ratio and microbial biomass C/N ratio, but reduced NH4+ and NO(3)( )(-)in the wheat soils when compared with rotary tillage straw return (RT-SR) and no tillage with straw removal (NT-NS). These findings suggest that long-term DB-SR application has positive effects on grain production, but possibly through different mechanisms in improving soil processes. The yield-increasing effects on rice might result from improvements in soil fertility, whereas increased wheat yields can be ascribed to stimulated soil microbial activity.

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