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Phosphorus losses under heavy rain from the sloping farmlands in the purple hilly region of Southwestern China

文献类型： 外文期刊

作者： He, Xiaoling 1 ; Wang, Yongdong 1 ; Li, Tingxuan 1 ; He, Shuqin 2 ; Zheng, Zicheng 1 ; Zhang, Xizhou 1 ; Huang, Huagan 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Resources, 211 Huiming Rd, Chengdu 611130, Sichuan, Peoples R China

2.Sichuan Agr Univ, Coll Forestry, 211 Huiming Rd, Chengdu 611130, Sichuan, Peoples R China

3.Sichuan Acad Agr Sci, Soil & Fertilizer Res Inst, Chengdu 610066, Sichuan, Peoples R China

关键词： Growth stages of maize; Heavy rain; Phosphorus loss; Purple soil; Slope gradients; Tillage methods

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2019 年 19 卷 12 期

页码：

收录情况： SCI

摘要： Purpose Phosphorus (P) and sediment loss through runoffs to surface and ground water represent a risk to human and environmental health. The objective of this work was to understand the mechanisms of P loss under heavy rain from the purple soil of sloping farmlands. Materials and methods The work was carried out with simulated rainfall experiment at different maize growth stages. The combination of three factors was studied: tillage methods (flat planting, longitudinal ridge, and cross-ridge), slope gradients (10 degrees, 15 degrees, and 20 degrees), and maize growth stages (seedling stage, elongation stage, tasseling stage, and maturity stage). Surface runoff, subsurface runoff, sediment, P content in runoff, and sediment were determined. Results and discussion The rate of sediment yield was positively and non-linearly correlated with the runoff shear force and increased quickly when using the longitudinal ridge tillage method. Longitudinal ridge and 20 degrees slope croplands showed greater erodibility, which resulted in higher runoff, sediment yield, and associated P loss. Total phosphorus (TP) and available phosphorus (AP) losses during the entire growth period were 17.58 mg m(-2) and 32.86 mg m(-2), in the longitudinal ride on 20 degrees slope. Cross-ridge treatment can effectively prevent the loss of P. The P loss occurred violently on 20 degrees slope, and there was little difference in the P loss between 10 degrees and 15 degrees slopes. Dissolved total phosphorus (DTP) loss dominated the TP loss in runoff, accounting for more than 55.58% of the DTP losses in all the treatments. Conclusions These results indicate the application of flat planting and cross-ridge tillage in croplands with less than 20 degrees slope, as these will minimize the pollution of soil and water resources by reducing P loss in runoff and sediment.

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