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Long-term nutrient inputs shift soil microbial functional profiles of phosphorus cycling in diverse agroecosystems

文献类型： 外文期刊

作者： Dai, Zhongmin 1 ; Liu, Guofei 1 ; Chen, Huaihai 4 ; Chen, Chengrong 5 ; Wang, Jingkuan 6 ; Ai, Shaoying 7 ; Wei, Dan 8 ;

作者机构： 1.Zhejiang Univ, Inst Soil,Coll Environm,Water Resources, Environm Sci,Resource Sciences, Hangzhou, Peoples R China

2.Zhejiang Univ, Zhejiang Prov Key Lab Agr Resources, Environm, Hangzhou, Peoples R China

3.Zhejiang Univ, Rural Dev Acad, Hangzhou, Peoples R China

4.Biological Sciences Div, Pacific NW Natl Lab, Richland, WA 99354 USA

5.Griffith Univ, Australian Rivers Inst, Sch Environm, Sciences, Nathan Campus, Brisbane, Qld 4111, Australia

6.Shenyang Agr Univ, Coll Land, Environm, . 120 Dongling Rd, Shenhe Dist, Shenyang, Liaoning, Peoples R China

7.Inst Agr Resources, Guangdong Acad Agr Sciences, Environm, Guangzhou, Guangdong, Peoples R China

8.Heilongjiang Acad Agr Sciences, Soil Fertilizer, Environm Resource, Haerbin, Heilongjiang, Peoples R China

9.Jiangxi Key Lab Red Soil Arable Land Conservat, Jiangxi Institue Red Soil, Jinxian, Peoples R China

10.La Trobe Univ, Centre AgriBioscience,Dept Anim,Plant, Soil Sciences, Bundoora, Vic 3086, Australia

期刊名称：ISME JOURNAL （ 影响因子：10.302； 五年影响因子：12.284 ）

ISSN： 1751-7362

年卷期： 2020 年 14 卷 3 期

页码：

收录情况： SCI

摘要： Microorganisms play an important role in soil phosphorus (P) cycling and regulation of P availability in agroecosystems. However, the responses of the functional and ecological traits of P-transformation microorganisms to long-term nutrient inputs are largely unknown. This study used metagenomics to investigate changes in the relative abundance of microbial P-transformation genes at four long-term experimental sites that received various inputs of N and P nutrients (up to 39 years). Long-term P input increased microbial P immobilization by decreasing the relative abundance of the P-starvation response gene (phoR) and increasing that of the low-affinity inorganic phosphate transporter gene (pit). This contrasts with previous findings that low-P conditions facilitate P immobilization in culturable microorganisms in short-term studies. In comparison, long-term nitrogen (N) input significantly decreased soil pH, and consequently decreased the relative abundances of total microbial P-solubilizing genes and the abundances of Actinobacteria, Gammaproteobacteria, and Alphaproteobacteria containing genes coding for alkaline phosphatase, and weakened the connection of relevant key genes. This challenges the concept that microbial P-solubilization capacity is mainly regulated by N:P stoichiometry. It is concluded that long-term N inputs decreased microbial P-solubilizing and mineralizing capacity while P inputs favored microbial immobilization via altering the microbial functional profiles, providing a novel insight into the regulation of P cycling in sustainable agroecosystems from a microbial perspective.

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