陕南后沟小流域泥沙与总氮随径流输移特征
发布时间：2019-08-12 15:27
【摘要】：以2011-2012年汛期野外降雨资料为基础,分析陕南后沟小流域泥沙和总氮(TN)随径流流失特征。研究结果表明,坡耕地、退耕地、菜地泥沙流失通量与径流量拟合方程采用S形曲线方程表达较为合适;果园采用线性函数反映两者之间的关系。坡耕地和菜地径流量与TN浓度采用倒数曲线表达,而果园和退耕地采用线性函数表达;汛期不同土地利用类型土壤流失通量顺序为:菜地(4 011.7kg/hm2)坡耕地(1 720.0kg/hm2)退耕地(1 606.3kg/hm2)果园(776.3kg/hm2);径流中TN流失通量顺序为:菜地(15.29kg/hm2)退耕地(7.20kg/hm2)坡耕地(4.92kg/hm2)果园(1.37kg/hm2)。2011-2012年汛期后沟小流域出口径流动能与泥沙量流失量采用线性函数和幂函数描述两者之间关系,而TN流失量与径流动能采用对数函数和幂函数表示。汛期末期阶段泥沙和TN流失风险最大。
[Abstract]:Based on the field rainfall data of the flood season in the period of 2011-2012, the characteristics of sediment and total nitrogen (TN) of the small watershed in the south of the southern Shaanxi Province are analyzed with the runoff loss. The results show that the equation of S-shaped curve is suitable for the runoff and runoff of the cultivated land, the cultivated land and the vegetable, and the relationship between the two is reflected by the linear function of the orchard. The runoff and TN concentration of the slope land and the vegetable field were expressed by the reciprocal curve, while the orchard and the cultivated land were expressed by linear function; the flux order of the soil loss in different land use types in the flood season was: (4, 011.7 kg/ hm2) of the slope land (1 720.0 kg/ hm2) and the uncultivated land (1606.3kg/ hm2) of the orchard (776.3kg/ hm2); The sequence of TN loss flux in runoff is: (15.29 kg/ hm2) of cultivated land (7.20 kg/ hm2) and (4.92 kg/ hm2) of orchard (1.37 kg/ hm2). And the TN loss and the kinetic energy of the runoff are expressed by a logarithmic function and a power function. At the end of the flood season, the risk of sediment and TN loss is the greatest.
【作者单位】： 绵阳师范学院;中国科学院水利部水土保持研究所;西安理工大学;西华师范大学;
【基金】：国家自然科学基金项目(41471226) 中国博士后科学基金项目(2014M562338) 绵阳师范学院博士科研启动项目(QD2014A002);绵阳师范学院青年基金项目(2013B09) 四川省教育厅项目(16ZB0311)
【分类号】：S157.1
本文编号：2525797
[Abstract]:Based on the field rainfall data of the flood season in the period of 2011-2012, the characteristics of sediment and total nitrogen (TN) of the small watershed in the south of the southern Shaanxi Province are analyzed with the runoff loss. The results show that the equation of S-shaped curve is suitable for the runoff and runoff of the cultivated land, the cultivated land and the vegetable, and the relationship between the two is reflected by the linear function of the orchard. The runoff and TN concentration of the slope land and the vegetable field were expressed by the reciprocal curve, while the orchard and the cultivated land were expressed by linear function; the flux order of the soil loss in different land use types in the flood season was: (4, 011.7 kg/ hm2) of the slope land (1 720.0 kg/ hm2) and the uncultivated land (1606.3kg/ hm2) of the orchard (776.3kg/ hm2); The sequence of TN loss flux in runoff is: (15.29 kg/ hm2) of cultivated land (7.20 kg/ hm2) and (4.92 kg/ hm2) of orchard (1.37 kg/ hm2). And the TN loss and the kinetic energy of the runoff are expressed by a logarithmic function and a power function. At the end of the flood season, the risk of sediment and TN loss is the greatest.
【作者单位】： 绵阳师范学院;中国科学院水利部水土保持研究所;西安理工大学;西华师范大学;
【基金】：国家自然科学基金项目(41471226) 中国博士后科学基金项目(2014M562338) 绵阳师范学院博士科研启动项目(QD2014A002);绵阳师范学院青年基金项目(2013B09) 四川省教育厅项目(16ZB0311)
【分类号】：S157.1
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