Phosphorus status and adsorption characteristics of perennial vegetable-cultivated soils in South China

文献类型： 外文期刊

第一作者： Ning, Jianfeng

作者： Ning, Jianfeng;Yao, Jianwu;Wang, Ronghui;Li, Yichun;Li, Mengjun;Shen, Jian;Chen, Yong;Zhu, Shijian;Wang, Siyuan;Luo, Jiling;Li, Tong;Zeng, Ruikun;Ai, Shaoying

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.752； 五年影响因子：4.069 ）

ISSN： 1932-6203

年卷期： 2022 年 17 卷 4 期

页码：

收录情况： SCI

摘要： Phosphorus (P) is an essential element for crop production and a key source of nonpoint pollution in agroecosystems. In this study, we sought to analyze P levels and the factors affecting soil P availability, via P adsorption, in a typical field system that is characterized by the year-round cultivation of vegetables. A total of 190 sites were sampled from vegetable fields in Guangdong Province, South China. Within the research area, average concentrations of 124.49 mg P kg(-1) and 1.55 g P kg(-1) were recorded for available P (AP) and total P (TP), respectively, which are 8.53- and 1.78-fold higher, respectively, than the corresponding values recorded in 1980. The determined P adsorption maximum (Q(m)) averaged at 488.38 mg kg(-1), which represents a reduction of 16% compared to the values obtained four decades ago. Accumulations of both TP and AP were found to be negatively correlated with the soil's maximum adsorption buffering capacity (MBC), although no significant correlations with the soil binding energies (k) and Q(m), were seen. However, soil pH was found to be significantly correlated with k and Q(m) . Furthermore, both free Mn oxides (Mn-d) and silt concentrations in the soil were found to contribute to explaining the variations in Q(m). Collectively, the findings of this study provide evidence to indicate that there has been an excessive accumulation of P in the perennial vegetable fields of Guangdong Province over the past four decades, which may have had negative effects on the P supply potential of the soil by reducing the maximum adsorption buffering capacity.

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