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Relative contribution of roots and symbiotic fungi to wheat nitrogen uptake and N2O emissions under straw burial

文献类型： 外文期刊

作者： Kan, Zheng-Rong 1 ; Li, Yanling 1 ; Yang, Ruoyan 1 ; Yang, Xinyu 1 ; Wei, Qihang 1 ; Virk, Ahmad Latif 2 ; Qi, Jianying 3 ; Li, Feng-Min 1 ; Zhang, Zichang 4 ; Yang, Haishui 1 ;

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

2.Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China

3.South China Agr Univ, Coll Agr, Guangzhou 510642, Peoples R China

4.Inst Plant Protect, Jiangsu Acad Agr Sci, Nanjing, Peoples R China

5.Nanjing Agr Univ, Jiangsu Key Lab Informat Agr, Nanjing 210095, Peoples R China

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

关键词： Ditch-buried straw return; Crop yield; N 2 O; N uptake; Arbuscular mycorrhizal fungi; Root

期刊名称：RHIZOSPHERE （ 影响因子：3.7； 五年影响因子：3.8 ）

ISSN：

年卷期： 2023 年 28 卷

页码：

收录情况： SCI

摘要： Ditch-buried straw return (DB-SR), as a novel soil tillage practice, has shown the yield improvement in recent studies in comparison to rotary tillage with straw return (RT-SR). However, the underlying mechanisms are not well known. One field and two greenhouse experiments were conducted to compare the effects of DB-SR on grain yield and nitrogen (N) cycling with other straw managements [RT-SR and straw removal (CK)], and to identify the relative contribution of roots and arbuscular mycorrhizal fungi (AMF) to N cycling in a wheat based cropping system. The field experiment and literature reviews showed that DB-SR can significantly improve annual yields by 19.1% and 15.5% compared with CK and RT-SR, respectively under different cropping systems. The pot experiments supported the findings of field experiments that DB-SR can improve wheat N uptake and decrease N2O emissions driven by trade-offs between AMF and roots depending on soil textures. Roots showed larger impacts in promoting N uptake for wheat and N loss from N2O emissions compared with AMF in clay soils under DB-SR. However, a contrasting pattern was detected in sandy soils where AMF improved N uptake and reduced N2O emissions. Our results highlight that trade-offs between roots and AMF under DB-SR can affect wheat N uptake, and DB-SR could be a practical measure to increase grain yield by improving N uptake and mitigate N2O emission.

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