Responses of arbuscular mycorrhizal fungi to straw return and nitrogen fertilizer reduction in a rainfed maize field

文献类型： 外文期刊

第一作者： Peng, Zhenling

作者： Peng, Zhenling;Xi, Hao;Liu, Yongjun;Mao, Lin;Feng, Huyuan;Zhang, Jianjun

作者机构：

关键词： agricultural sustainability; crop productivity; mycorrhizal colonization; mycorrhizal symbiosis; root length colonization; virtual taxon

期刊名称：PEDOSPHERE （ 影响因子：5.7； 五年影响因子：5.7 ）

ISSN： 1002-0160

年卷期： 2024 年 34 卷 2 期

页码：

收录情况： SCI

摘要： Straw return can be used to reduce fertilizer input and improve agricultural sustainability and soil health. However, how straw return and reduced fertilizer application affect beneficial soil microbes, particularly arbuscular mycorrhizal fungi (AMF), remains poorly understood. Here, we conducted a five-year field experiment in a rainfed maize field on the Loess Plateau of northwestern China. We tested four treatments with straw return combined with four nitrogen (N) application rates, i.e ., 100%, 80%, 60%, and 0% of the common N application rate (225 kg N ha - 1 year - 1 ) in this region, and two reference treatments (full or no N application), with three replicates for each treatment. Mycorrhizal colonization was quantified and AMF communities colonizing maize roots were characterized using Illumina sequencing. Forty virtual taxa (VTs) of AMF were identified in root samples, among which VT113 (related to Rhizophagus fasciculatus ) and VT156 (related to Dominikia gansuensis ) were the predominant taxa. Both root length colonization and AMF VT richness were sensitive to N fertilization, but not to straw return; furthermore, both gradually increased with decreasing N application rate. The VT composition of the AMF community was also affected by N fertilization, but not by straw return, and the community variation could be well explained by soil available N and phosphorus concentrations. Additionally, 60%, 80%, and full N fertilization produced similar maize yields. Thus, our study revealed the response patterns of AMF to straw return and N fertilizer reduction and showed that straw return combined with N fertilizer reduction may be a promising practice to maintain mycorrhizal symbiosis concomitantly with crop productivity.

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