延河流域三种土壤可蚀性K值估算方法比较

发布时间：2018-03-14 02:40

本文选题：延河流域　切入点：土壤可蚀性K值　出处：《土壤学报》2017年05期 　论文类型：期刊论文

【摘要】：土壤可蚀性因子K是表征土壤侵蚀作用的敏感指标。采用3种土壤可蚀性K值估算方法(Torri.D模型、EPIC模型、Shirazi公式法)对延河流域土壤可蚀性进行对比研究,以实测K值为依据,采用相关性分析和模型估算筛选出符合该区侵蚀特点的土壤可蚀性估算方法。结果表明:延河流域土壤中有机碳、黏粒、粉粒含量随植被覆盖度的变化由北向南逐渐增加,平均质量直径(D_(MW))表现为森林森林草原草原,K_(EPIC)和Kshirazi与D_(MW)呈正相关,而Torri.D模型估算K值(K_(Torri.D))与D_(MW)呈相反的变化趋势,即从草原到森林草原再到森林,土壤团聚体稳定性和抗侵蚀性逐渐增加。K_(Torri.D)的变化范围为0.068~0.147 5,高于真实K值(0.031 2~0.079 6),相比于其他两种方法,Torri.D模型平均绝对误差(MAE)、平均相对误差(MRE)和均方根误差(RMSE)更接近于0,而精度因子(Af)更接近1,具有更高的可信度,更加适用于延河流域土壤侵蚀敏感性评价和土壤流失量预测。
[Abstract]:Soil erodibility factor K is a sensitive index to characterize soil erosion. A comparative study on soil erodibility in Yanhe River Basin was carried out by using three methods of estimating K value of soil erodibility by using Torri.D model and epic model Shirazi formula. Correlation analysis and model were used to estimate the soil erodibility. The results showed that the content of organic carbon, clay and silt increased gradually from north to south with the change of vegetation coverage in Yanhe River Basin. The average mass diameter (D / M) was positively correlated with Kshirazi and Kshirazi), while the K value estimated by Torri.D model was opposite to that of D / M, that is, from steppe to forest grassland to forest. The variation range of soil aggregate stability and erosion resistance is 0.068 / 0.147 5, which is higher than the true K value (0.031 2 / 0.079 6). Compared with the other two methods, the mean absolute error of Torri.D model is MAEN, the average relative error is MREE) and the root mean square error (RMSE) is higher than that of the other two methods. Near zero, and the accuracy factor (AfA) is closer to 1, which is more reliable. It is more suitable for the sensitivity evaluation of soil erosion and the prediction of soil loss in Yanhe River Basin.
【作者单位】：西北农林科技大学机械与电子工程学院;西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金项目(41671280) 水利部公益性行业科研专项经费项目(201501045) 西北农林科技大学基本业务费专项(2452015092)资助~~
【分类号】：S157

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