College of Resources, Sichuan Agricultural University, 211, Huiming Road, 611130, Chengdu, People's Republic of China.
College of Forestry, Sichuan Agricultural University, 211, Huiming Road, 611130, Chengdu, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Aug;26(23):24088-24098. doi: 10.1007/s11356-019-05735-5. Epub 2019 Jun 21.
Colloidal particles in runoff could play an important role in phosphorus (P) transfer from sloped farmland to waterbodies. We investigated the distribution of P in different-size particles from a purple soil and colloidal phosphorus (CP) loss in runoff and sediment from sloped farmland in south-western China. The profile distribution of P showed obvious surface accumulation. The risk of P loss in topsoil was greater than those of the other soil layers on sloping farmland of purple soil. The concentration of soil particles of < 0.002 mm in purple soil profiles was low, but the total phosphorus (TP) and available phosphorus (AP) concentrations of soil particles of < 0.002 mm were high. During a rainfall event, CP loss is significantly power function related to the runoff yield rate, and is linearly related to the sediment yield rate. The majority of P in runoff was CP. The total loss of CP in runoff was 139.52 g ha, in which surface runoff accounted for 64.3%. CP loss can be controlled by controlling runoff from sloping farmland, especially surface runoff. Our results suggest that CP loss should be valued in the process of nutrient loss, as well as CP transfer should be given greater consideration in the mechanistic studies of the P transfer process.
径流中的胶体颗粒在磷（P）从坡耕地向水体转移过程中可能发挥重要作用。本研究调查了来自紫色土的不同粒径颗粒中 P 的分布以及中国西南部坡耕地径流水和沉积物中胶体磷（CP）的损失情况。P 的剖面分布表现出明显的表聚性。与其他土层相比，坡耕地表土中 P 流失的风险更大。紫色土剖面中<0.002 mm 的土壤颗粒浓度较低，但<0.002 mm 的土壤颗粒总磷（TP）和有效磷（AP）浓度较高。在降雨事件中，CP 损失与径流量呈显著的幂函数关系，与泥沙产量呈线性关系。径流中的大部分 P 为 CP。CP 总流失量为 139.52 g·ha，其中地表径流占 64.3%。通过控制坡耕地径流量，特别是控制地表径流，可以控制 CP 的流失。本研究结果表明，在养分流失过程中应重视 CP 的流失，同时在 P 迁移过程的机制研究中应更加关注 CP 的迁移。
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