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The high accumulation of phosphorus in high-yield paddy soils: A new insight from cutans

文献类型： 外文期刊

作者： Cheng, Yueqin 1 ; Pan, Shang 2 ; Xu, Sheng 1 ; Su, Mu 3 ; Liang, Qingqing 3 ; Wang, Ying 3 ; Wang, Haihou 4 ; Li, Zhen 3 ; Yang, Zhimin 2 ; Yang, Linzhang 6 ;

作者机构： 1.Nanjing Protect Stn Cultivated Land Qual, Nanjing 210036, Peoples R China

2.Nanjing Agr Univ, Coll Agrograssland Sci, Nanjing 210095, Peoples R China

3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China

4.Taihu Res Inst Agr Sci, Suzhou 215100, Peoples R China

5.Nanjing Agr Univ, Jiangsu Key Lab Organ Waste Utilizat, Nanjing 210095, Peoples R China

6.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agr Environm Lower Reaches Yangtze River, Nanjing 210014, Peoples R China

7.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

关键词： Cutan; Phosphorus; Microorganisms; Paddy field; Mossbauer spectroscopy

期刊名称：GEODERMA （ 影响因子：6.1； 五年影响因子：7.0 ）

ISSN： 0016-7061

年卷期： 2023 年 429 卷

页码：

收录情况： SCI

摘要： Phosphorus (P) is a key limiting nutrient for crops. Oscillation of redox conditions usually induces formation of Fe-enriched cutans in the plow layer of paddy soils. This study investigated P biogeochemistry in the cutans, which were collected from high-yield paddy soils in Taihu Lake region, China. Mo & BULL;ssbauer spectroscopy showed that the content of Fe3+ was eight times higher than Fe2+ in the cutans. Based on the evidences from XRD and wet chemical analysis, the enriched Fe in the cutans mostly existed as amorphous oxides, which owned high surface areas for P sorption. In addition, the cutans were composed of spherical particles with diameters of 20-130 & mu;m under microscopy. Moreover , the particles showed evident "trench" structures on their top surface under SEM imaging. These features caused the cutans to retain three times higher P than that in the matrix soils. Furthermore, the cutans demonstrated both high microbial richness and community diversity, in contrast to the matrix soils. In particular, the abundance of phosphate-solubilizing fungi (with relatively highly competitive saprophytic ability) was also significantly promoted. Therefore, the cutans could be considered as hotspots of P accumulation in paddy soils. The subsequent enhancement of the available P would promote rice production.

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