延河流域三种土壤可蚀性K值估算方法比较

被引：47

作者：

林芳 ^{[1
]}

朱兆龙 ^{[1
,2
]}

曾全超 ^{[2
]}

安韶山 ^{[2
]}

机构：

[1] 西北农林科技大学机械与电子工程学院

[2] 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

来源：

土壤学报 | 2017年 / 54卷 / 05期

关键词：

延河流域; 土壤可蚀性K值; Torri.D模型;

D O I：

暂无

中图分类号：

S157 [水土保持];

学科分类号：

090301 [土壤学];

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(DMW)表现为森林>森林草原>草原,KEPIC和Kshirazi与DMW呈正相关,而Torri.D模型估算K值(KTorri.D)与DMW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。KTorri.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。

引用

页码：1136 / 1146

页数：11

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