Preprints
https://doi.org/10.5194/egusphere-2022-1134
https://doi.org/10.5194/egusphere-2022-1134
 
01 Dec 2022
01 Dec 2022

The role of long-term mineral and manure fertilization on P species accumulation and phosphate solubilizing microorganisms in paddy red soils

Shuiqing Chen1, Jusheng Gao2, Huaihai Chen3, Zeyuan Zhang1, Jing Huang2, Lefu Lv1, Jinfang Tan1, and Xiaoqian Jiang1 Shuiqing Chen et al.
  • 1School of Agriculture, Sun Yat-sen University, Guangzhou, Guangdong 510275, PR China
  • 2Qiyang Agro-ecosystem of National Field Experimental Station, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Qiyang 426182, China
  • 3School of Ecology, Sun Yat-sen University, Guangzhou, Guangdong 510275, PR China

Abstract. Fertilization managements have important impacts on soil P transformation, turnover, and bioavailability. Thus, long-term fertilization experiments (~38 years) with the application of different inorganic and organic fertilizers in paddy red soils were conducted to determine their effect on P pool accumulation and microbial communities, especially for phosphate solubilizing microorganisms (PSM). Long-term inorganic P fertilization increased the concentrations of total P (~479 mg/kg), available P (~417 mg/kg), and inorganic P (~18 mg/kg), but manure fertilization accelerated the accumulation of organic P, especially for orthophosphate monoesters (e.g. myo-IHP, ~12 mg/kg). Long-term mineral fertilization decreased bacterial richness, evenness, and complexation of bacterial networks. In contrast, long-term manure fertilization and rhizosphere accumulated more amounts of total carbon, total nitrogen, and organic carbon, as well as regulated the soil pH, thus improving the separation of bacterial communities. Unlike bacteria, the responses of fungi to those factors were not sensitive. Furthermore, PSM compositions were greatly influenced by fertilization managements and rhizosphere. For example, inorganic P fertilization increased the abundance of Thiobacillus (i.e. the most abundant phosphate solubilizing bacteria (PSB) in this study) and shifted the community structure of PSB. Correspondingly, the concentrations of inorganic and total P were the key factors for the variation of PSB community structure. These findings are beneficial for understanding P accumulation, responses of PSB, and soil P sustainable fertility under different fertilization strategies.

Shuiqing Chen et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1134', Anonymous Referee #1, 18 Dec 2022
  • RC2: 'Comment on egusphere-2022-1134', Anonymous Referee #2, 10 Jan 2023

Shuiqing Chen et al.

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Short summary
Long-term inorganic P fertilization increased total P, available P, and inorganic P, but manure fertilization accelerated the accumulation of organic P. Long-term mineral fertilization had a negative impact on bacterial communities, whereas manure fertilization and rhizosphere provided more nutrient that improved the separation of bacterial communities. Correspondingly, P indicators such as inorganic P and total P were related to the variation of phosphorus solubilizing bacterial community.