ISWC OpenIR  > 水保所知识产出(1956-2013)
草地植被覆盖度坡度及雨强对坡面径流含沙量影响试验研究
王栋栋1; 张庆玮1; 张琪琳1; 田娜玲1
2017
Source Publication农 业 工 程 学 报
Volume33Issue:15Pages:119-07
Abstract

为研究植被修复状态下径流含沙量变化。该试验运用人工模拟降雨试验方法,分析了径流含沙量草被调控效益
变化。结果:1)不同降雨强度或坡度下,平均径流含沙量随草被盖度的增大而减小,草被盖度从 30%~70%,含沙量分
别降低约 10 或 5 kg/m 3 ,可用线性方程显著描述。草被消减雨强对径流含沙量影响大于草被消减坡度的。平均径流含沙
量随降雨强度或坡度的增大而增大,分别可用幂函数或指数函数方程显著描述,决定系数在 0.5 或 0.8 以上。2)基于单
位水流功率建立幂函数模型决定系数为 0.940,模型有效系数为 0.986,说明模型模拟精度都较高。3)基于坡度、雨强和
盖度建立指数函数模型决定系数为 0.937,模型有效系数为 0.894,说明模型模拟精度都较高。该研究可以预测草地坡面
含沙量,为生态建设和流域管理提供指导。

Other Abstract

The purpose of this study was to model sediment concentration of sheet erosion on rangeland, which has a major
impact on strengthening river basin management and controlling the source of soil erosion. The impact of herbaceous
vegetation on sediment concentration under different slopes or rain intensities was studied by artificial rainfall experiment. The
relationship of sediment concentration and slope gradient, rainfall intensity, and hydraulic parameters, such as shear stress,
stream power and unit stream power, was investigated to derive an accurate experimental model. Each experiment soil pan
with metal frames was 140 cm long, 120 cm wide and 2.5 cm deep. The experiment soil sample was collected from Ansai
County, Shaanxi Province in China. After the soil was packed, herbaceous vegetation (Poa pratensis L.) was transplanted in a
banded uniform layout. Poa pratensis L. was a gramineous plant, and the current year’s Poa pratensis L. was selected. The
duration of all simulated rainfall events was 40 min. The experiment was conducted at 5 herbaceous vegetation cover densities
(30%, 40%, 50%, 60%, and 70%), 5 rainfall intensities (0.7, 1, 1.5, 2, and 2.5 mm/min) and 5 slopes (7°, 10°, 15°, 20°, and
25°), respectively. All combinations were tested with 2 replicates of each run, a total of 90 experimental units. All statistical
analyses were carried out using Excel or spss 18.0. Results show that: 1) Herbaceous vegetation not only decreases sediment
concentration, but also reduces the effect of rainfall intensity or slope on it, which would increase with cover increasing. Cover
increases from 30% to 70%, herbaceous vegetation decreases sediment concentration by more than 5 kg/m 3 , and reduces the
effect of rainfall intensity or slope on it by more than 10 kg/m 3 . Under different slopes or rainfall intensities, sediment
concentration decreases as linear equations with cover, and the relationship between sediment concentration and cover is
significant (P<0.01). Under different covers, sediment concentration totally increases as power equations or exponential
equations with rainfall intensity or slope, the relationship between sediment concentration and rainfall intensity is very well
(P<0.01), and the relationship between sediment concentration and slope is also good (P<0.01). 2) Unit stream power is the
parameter most suitably describing sediment concentration with an exponential equation among the 3 hydraulic parameters
considered in this paper. Sediment concentration increases as shear stress or stream power increases, and both can be described
by a logarithmic equation, but the relationship between sediment concentration and shear stress or stream power is poor. 3)
Rainfall intensity, slope and cover can be used to predict sediment concentration with an exponential function accurately,
which was satisfactory for predicting sediment concentration with the R 2 value of 0.937 and the NE (Nash coefficient) of 0.894.
Meanwhile, unit stream power also can be used to predict sediment concentration with a power function equation, which was
satisfactory for predicting sediment concentration with the R 2 value of 0.940 and the NE of 0.986. Vegetation species, layout
and root morphology affect the simulation effect of sediment concentration on rangeland. In the later period, the vegetation
species, layout and root morphology should be studied to quantify the sediment concentration and optimize the sediment
concentration model.

Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8368
Collection水保所知识产出(1956-2013)
Affiliation1.西北农林科技大学水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌 712100
2.中国科学院水利部水土保持研究所,杨凌 712100
Recommended Citation
GB/T 7714
王栋栋,张庆玮,张琪琳,等. 草地植被覆盖度坡度及雨强对坡面径流含沙量影响试验研究[J]. 农 业 工 程 学 报,2017,33(15):119-07.
APA 王栋栋,张庆玮,张琪琳,&田娜玲.(2017).草地植被覆盖度坡度及雨强对坡面径流含沙量影响试验研究.农 业 工 程 学 报,33(15),119-07.
MLA 王栋栋,et al."草地植被覆盖度坡度及雨强对坡面径流含沙量影响试验研究".农 业 工 程 学 报 33.15(2017):119-07.
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