模拟降雨条件下秦岭北麓土壤磷素流失特征

发布时间：2018-06-13 18:59

本文选题：人工降雨 + 土壤侵蚀　；参考：《水土保持学报》2016年02期

【摘要】：以秦岭北麓竹峪地区为研究区域,采用模拟人工降雨的试验方法,研究了不同坡度(5°,10°)和不同降雨强度(1.1,1.3,1.5mm/min)下该区域田地土壤磷素流失过程规律。结果表明:降雨强度能够影响径流中溶解态磷(DP)的含量,但二者之间并非呈线性关系;相比于幂函数而言,指数函数模型更适合模拟秦岭北麓竹峪地区土壤径流溶解态磷(DP)浓度变化过程(R~20.75);降雨初期,泥沙中(STP)含量相对较高,但随着降雨的延续其浓度会有所下降,并最终保持在一个较稳定的水平上;泥沙全磷(STP)的流失速率随着降雨时间以幂函数的形式逐渐递减,同时发现泥沙全磷(STP)的流失速率与土壤流失速率之间存在着明显的线性关系(R~2=0.92),说明养分流失量累积过程与产沙过程一致,可以利用土壤侵蚀状况来进一步预测养分流失状况。
[Abstract]:Taking Zhuyu area in the northern part of Qinling Mountains as the study area, the process of soil phosphorus loss was studied under the conditions of different slope (5 掳~ 10 掳) and different rainfall intensity (1. 1 ~ 1. 3 卤1. 5 mm / min) by simulated artificial rainfall. The results show that rainfall intensity can affect the content of dissolved phosphorus (DPN) in runoff, but the relationship between them is not linear, and compared with power function, The exponential function model is more suitable to simulate the variation process of dissolved phosphorus (DPN) concentration in soil runoff in Zhuyu area, northern part of Qinling Mountains, and the content of STP in sediment is relatively high at the beginning of rainfall, but it will decrease with the continuation of rainfall. The loss rate of sediment total phosphorus (STP) decreases gradually with rainfall time in the form of power function. At the same time, it was found that there was an obvious linear relationship between the loss rate of sediment total phosphorus (STP) and the soil loss rate, which indicated that the accumulation process of nutrient loss was consistent with the process of sediment yield, and soil erosion could be further used to predict the nutrient loss.
【作者单位】：西北农林科技大学资源环境学院;农业部西北植物营养与农业环境重点实验室;西北农林科技大学水土保持研究所;
【基金】：国家“十二五”科技支撑计划项目(2012BAD15B04)
【分类号】：S157.1

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