Development of soil phosphorus storage capacity for phosphorus retention/release assessment in neutral or alkaline soils

Gang Xu, Mengyu Yue, Yuxuan Ren, Jiawei Song and Xiaobing Chen
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Gang Xu: Schoolof Geography and Tourism, Qufu Normal University, Rizhao, P.R. China
Mengyu Yue: Schoolof Geography and Tourism, Qufu Normal University, Rizhao, P.R. China
Yuxuan Ren: Schoolof Geography and Tourism, Qufu Normal University, Rizhao, P.R. China
Jiawei Song: YantaiInstitute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, P.R. China
Xiaobing Chen: YantaiInstitute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, P.R. China

Plant, Soil and Environment, 2022, vol. 68, issue 3, 146-154

Abstract: The concept of the soil phosphorus storage capacity (SPSC) was successfully used to evaluate the phosphorus (P) loss risk and the P retention capacity of acidic soil. This study extended the concept of SPSC from acidic soil to neutral or alkaline soil. A total of 95 surfaces (0-10 cm) soil samples were collected from the Yellow River Delta (YRD) for use in this study. Batch sorption experiments, correlation analysis, stepwise regression, and a split-line model were used to calculate the threshold value of the degree of P saturation (DPS). The SPSC was developed based on the DPS threshold value. Based on a DPS threshold value of 11.5%, we developed the following equation for calculating the SPSC: SPSC = (11.5% - soil DPS) × (0.113 × SOM (soil organic matter) + 1.343 × CaCO3). In the continuous system in this watershed, from wetland to farmland, the SPSC for vegetable fields (-94.7 ± 79.1 mg/kg) was lowest and that of the restored wetland (76.3 ± 26.1 mg/kg) was the highest. Along the transition zone in the YRD, both the natural soil development and human alternations significantly affected the soil P loss/retention capacity. In terms of P storage, the restored wetlands are the highlands for P retention and the vegetable fields contribute significantly to the P loss in the YRD. As a result, we strongly recommend that the restored wetlands be fully utilised for P retention and that P fertiliser no longer be applied to the vegetable fields to prevent P loss into the watershed.

Keywords: macronutrient; accumulation; environmental risk; external phosphorus pollution; land uses (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:68:y:2022:i:3:id:482-2021-pse

DOI: 10.17221/482/2021-PSE

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