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| Investigating the influence of short-term phosphorus depletion on phosphorus forms and the bacterial community in cinnamon soil |
| Received:October 09, 2023 |
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| KeyWord:cinnamon soil;P depletion;olsen-P;P form;soil property;bacterial community |
| Author Name | Affiliation | E-mail | | MA Xiuguo | College of Agriculture, Guizhou University, Guiyang 550025, China
Institute of Plant Nutrition and Resource Environment, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | | | YANG Huawei | Institute of Plant Nutrition and Resource Environment, Beijing Academy of Agriculture and Forestry, Beijing 100097, China
School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | ZUO Qiang | Institute of Plant Nutrition and Resource Environment, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | | | MA Liang | Institute of Plant Nutrition and Resource Environment, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | | | WANG Shengtao | Beijing Cultivated Land Construction and Protection Center, Beijing 100074, China | | | YAN Fang | Beijing Cultivated Land Construction and Protection Center, Beijing 100074, China | | | ZHANG Lei | Beijing Cultivated Land Construction and Protection Center, Beijing 100074, China | | | CHEN Zhu | College of Agriculture, Guizhou University, Guiyang 550025, China | 274586492@qq.com | | CHEN Yanhua | Institute of Plant Nutrition and Resource Environment, Beijing Academy of Agriculture and Forestry, Beijing 100097, China | yhchen55@126.com |
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| Abstract: |
| Phosphorus（P）fertilizer is crucial for high crop yields. However, excessive P application and its low utilization efficiency can lead to the accumulation of P in the soil, exacerbating the depletion of P resources and the risk of water eutrophication. Therefore, studying the depletion characteristics of accumulated P in the soil can provide a theoretical basis for improving the efficient utilization of accumulated P in the soil and reducing environmental risks. This study employed corn as the experimental crop and cinnamon soil with initial Olsen-P contents of 17.23 mg·kg-1（T1）, 40.20 mg·kg-1（T2）, 108.62 mg·kg-1（T3）, and 181.33 mg·kg-1（T4）as the tested soil. Through controlled pot experiments, we consecutively cultivated five cycles of corn to deplete the accumulated P content in the soil. We analyzed changes in soil Olsen-P content, P forms（determined using an improved Hedley method）, soil physicochemical properties, and bacterial community structure during the process of P depletion. During the process of P depletion in cinnamon soil, the Olsen-P content showed an overall decreasing trend, with higher initial levels resulting in greater declines. In the context of the active P component, treatment T1 displayed a significant increase, whereas treatments T2, T3, and T4 showed substantial decreases. The moderate decreases in active P content, exhibiting a trend of initially decreasing and then increasing during depletion, were primarily influenced by Dil.HCl-Pi and NaOH -Po. The stable P content showed an increase, primarily ascribed to the increased levels of Conc. HCl-Pi and Residual-P. Notable correlations existed between the content of soil-Olsen-P, organic matter, and various P forms（NaHCO3-Pi, NaHCO3-Po, and NaOH-Pi）. P depletion altered the structure and composition of bacterial communities, with the T4 treatment demonstrating the most significant effect. At the phylum level, the T4 treatment induced a significant decline in the relative abundance of Cyanobacteria throughout the depletion process. The relative abundance of Gemmatimonadota and other taxa exhibited a significant increase during the depletion process. At the genus level, there was a pronounced reduction in the relative abundance of Nocardioides, norank_f_AKYG1722 and Arthrobacter throughout the depletion process. The relative abundance of norank_f_67-14 and Ramlibacte exhibited a marked increase throughout the depletion process. Multiple bacterial genera, ranking among the top 40 in relative abundance, exhibited significant correlations with Olsen-P, active P, and organic matter content. Nocardioides and Arthrobacter genera demonstrated the potential to expedite the transformation of moderately active P into Olsen-P and active P. In the context of microbial ecology, genera such as Microvirga and Skermanella were likely to harness stable P reservoirs within the soil. The impact of cinnamon soil P depletion on soil P availability was elucidated, revealing a substantial reduction in inorganic P（NaHCO3-Pi）content within the active P fraction and organic P（NaOH-Po）in the moderately active P fraction. Concurrently, there was an observable elevation in the stable P content of the soil. Within the realm of soil P dynamics, the intricate process of P depletion resulted in a complex interplay among taxonomic entities. This included a symbiotic interaction between phyla such as Actinobacteria and Firmicutes and specific genera such as Nocardioides, Microvirga, and Skermanella. These interactions intricately shaped and modulated the availability of P in the soil matrix. This study provides a theoretical basis for the transformation of P forms and microbial regulation during the process of P depletion in cinnamon soil, offering support for the utilization of accumulated P in the soil. |
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