文献类型： 外文期刊

作者： Peng, Yi ¹ ; Duan, Yisheng ¹ ; Huo, Weige ¹ ; Zhang, Zuojian ¹ ; Huang, Da ¹ ; Xu, Minggang ² ; Wang, Xihe ³ ; Yang, Xueyun ⁴ ; Wang, Boren ² ; Kuzyakov, Yakov ⁵ ; Feng, Gu ¹ ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Beijing Key Lab Biodivers & Organ Farming, Beijing 100193, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Engn Lab Improving Qual Arable Land, Beijing 100081, Peoples R China

3.Xinjiang Acad Agr Sci, Inst Soil & Fertilizer & Agr Sparing Water, Urumqi 830091, Peoples R China

4.Northwest A&F Univ, Coll Resources & Environm, Key Lab Plant Nutr & Agrienvironm Northwest China, Minist Agr & Rural Affairs, Yangling 712100, Shaanxi, Peoples R China

5.Univ Gottingen, Dept Agr Soil Sci, Dept Soil Sci Temperate Ecosyst, D-37077 Gottingen, Germany

6.Peoples Friendship Univ Russia, RUDN Univ, Moscow 117198, Russia

关键词： Soil C:P ratio; Stoichiometric imbalance; MBP turnover; Microbial C:P ratio; Rhizosphere processes

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.605； 五年影响因子：7.116 ）

ISSN： 0178-2762

年卷期： 2022 年 58 卷 4 期

页码：

收录情况： SCI

摘要： The carbon-to-phosphorus (C:P) ratios of microorganisms were quantified in the rhizosphere and bulk soil collected from six typical fertilization regimes across three long-term experiments in humid (wheat-maize rotation), semiarid (wheat-maize rotation), and arid (maize-wheat-cotton rotation) climate zones. A P-32 labeling incubation experiment allowed to test the relationship between microbial biomass P (MBP) turnover time and the C:P stoichiometric imbalance (Soil(C:P)/Microb(C:P)) between soil (dissolved organic carbon:Olsen-P) and microorganisms (MBC:MBP). The MBC and MBN in the rhizosphere were 1.2 and 1.3 times higher than those in bulk soils, respectively, while the MBP was similar. The MBC:MBP ratio in the rhizosphere was 1.1 times higher than that in bulk soil, while the MBC:MBN ratio was similar. This finding suggested that C and P accumulation in the rhizosphere microorganisms was decoupled from that in the bulk soil. Compared to that in bulk soil, the MBP turnover in the rhizosphere was 1.1 times faster and microbially mediated P release was increased by 13% because of the decrease in the Soil(C:P)/Microb(C:P). Shoot P content was correlated with the rhizosphere Soil(C:P)/Microb(C:P) and P flux mediated by microorganisms. The Soil(C:P)/Microb(C:P) thresholds allowed to predict the start of an intensive competition between plants and microorganisms for P. Concluding, the stronger the Soil(C:P)/Microb(C:P) in the rhizosphere decrease, the faster is the MBP turnover of homeostatic microorganisms, and furthermore, the microbially mediated P release leads to the decoupling of microbial biomass C and P at the root-soil interface. Soil(C:P)/Microb(C:P) may be a predictor of the competition between plants and microorganisms.