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| Differential effects of slope position and land use on red soil phosphorus storage capacity: a case study of the Sunjia Small Watershed in Yingtan, Jiangxi, China |
| Received:September 17, 2023 |
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| KeyWord:red soil sloping cultivated land;soil phosphorus storage capacity;land use;phosphorus loss risk;Sunjia small watershed |
| Author Name | Affiliation | E-mail | | ZHENG Yi | College of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WANG Yanling | College of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | ylwang@nuist.edu.cn | | LIU Zhuoling | College of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | |
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| Abstract: |
| In this study, we aimed at providing a detailed analysis of the differential effects of slope position and land use on soil phosphorus storage capacity(SPSC) in red soil, offering a precise P loss risk evaluation in sloping cultivated land. Our study focused on the surface soil of various slope positions(i.e., hilltop, upslope, mid-slope, and downslope) and diverse land use types(i.e., paddy fields, peanut uplands, and citrus orchards) in the Sunjia Small Watershed in Yingtan, Jiangxi. We compared and analyzed the variations and differences in SPSC, investigating how various factors, such as total carbon(TC), total nitrogen(TN), total P(TP), available P, and iron-aluminum oxide content, could affect SPSC. Our results revealed SPSC ranges for paddy fields, peanut uplands, and citrus orchards soils as follows:-410.9 to -137.8 mg·kg-1, -283.8 to -128.0 mg·kg-1, and -280.6 to -36.3 mg·kg-1, respectively. With slope position reduction, SPSC significantly decreased in paddy fields(except for the positions at the bottom of the slope) and citrus orchard soils, while it increased in peanut uplands. Compared to paddy field soil, the peanut upland and citrus orchard SPSCs were relatively higher at the same slope position. Our correlation analysis revealed a significant positive correlation between the SPSCs in different slope positions of paddy fields, peanut upland, and citrus orchards with soil iron-aluminum oxides and with free iron-aluminum oxide influence being relatively the largest. Moreover, we also observed a significant negative correlation between available P, TC, and TN. The paddy field, peanut upland, and citrus orchard SPSCs were negative at different slope positions in the Sunjia watershed of Yingtan, indicating that the soil represents a P source and displays P loss risk. Moreover, paddy fields and citrus orchards at the bottom of the slope and peanut uplands at the hilltop display a relatively higher P loss risk, requiring timely and appropriate control measures to effectively reduce the potential and soil P loss risk, requiring timely and appropriate control measures to effectively reduce the potential and soil P loss risk. |
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