ISWC OpenIR  > 水保所知识产出(1956---)
路 培1; 王林华1; 吴发启2
Source Publication农 业 工 程 学 报

为定量分析土壤结皮对坡面侵蚀的影响,该文选择塿土、黄绵土、黑垆土和黄墡土 4 类土壤,分析其在 3 种雨
强(60、90、120 mm/h)下的结皮强度变化规律。结果表明,当土壤含水率高于 30%时,不同降雨强度下结皮强度差异不显
著(P>0.05),当含水率小于 30%时,结皮强度随降雨强度增大而增强。以杨凌塿土 10°坡面为例,进行坡面人工模拟降
面产沙量的 1.24~8.72 倍。相同降雨条件下,结皮强度越大,其产沙量越小。进一步通过灰色关联分析得出:随着坡面

Other Abstract

S oil crust plays an important role in rainfall, runoff and erosion process. When it comes to the present situation,
most studies analyze the impact mechanism of soil erosion on the existence of soil surface crust, through comparison analysis
of sediment yield, runoff producing and characteristic of hydrodynamic under the crust and no crust slope. However, limited
studies report on the characteristic of soil sediment yield, runoff produced and the rule of feature variation for hydrodynamic,
also, no quantitative evaluation about the hydraulics parameter's influence on sediment yield. Therefore, in our research,
according to crust strength variation and hydrodynamic characteristic under different crust strength, we conducted quantitative
analysis on the impact of crust on slope erosion, and through comparison analysis for characteristic of slope sediment yield,
under different crust intensities. We further analyzed the change features of hydraulics parameter under slope erosion, and
described strength of effect quantitatively under influence factor, for providing important material to predicate accurately and
effectively slope soil erosion. In this paper, the impact mechanism of soil crust on slope erosion was reported using
quantitative analysis method. The strength of soil crust change of 4 soil types (Lou soil, Loess soil, Heilu soils and Huangshan
soil) under 3 rainfall intensities (60, 90, 120 mm/h) was analyzed. Our results showed that the relationship between the crust
strength and rainfall intensity was complex when soil water content was more than 30%. However, when soil water content
was less than 30%, crust strength increased with the increase of rainfall intensity. Taking the 10° slope of Lou soil as an
example, sediment yield, shear stress, resistance coefficient and flow velocity of different crust strength under artificial rainfall
experiments were determined and analyzed. The existence of crust could reduce slope sediment yield effectively, and the
sediment yield of no crust slope was 1.24-8.72 times more than crust slope's. The crust on slope effectively reduced the erosion
and sediment yield. The greater the crust strength was, the stronger the reduction was. The flow shear stress, stream power,
resistance coefficient of no crust slope were all larger than the crust slope, but for crust slope, flow shear stress of various crust
strength was not significant different (P>0.05). Stream power and flow shear stress were enhanced with increase of crust
strength. The larger crust strength was, the smoother surface was, the larger flow velocity was, the smaller resistance was,
which improved the stream power. The stream power of high strength crust was larger than low strength crust, but with the
smaller sediment yield, its resistance of slope was large. Therefore, the formation of soil erosion was synthetic result of erosion
dynamic, slope resistance and soil anti-erodibility. The grey correlation analysis showed that with the increase of the soil crust
strength, the influence of the stream power on the erosion of the soil was decreased, and the effect of the resistance coefficient
was increased. Therefore, there was a positive effect of water flow on sediment reduction, and the soil erosion resistance of the
soil was enhanced with the increase of crust strength, so the erosion amount of soil would decrease greatly.

Document Type期刊论文
Corresponding Author吴发启
Affiliation1.西北农林科技大学水土保持研究所,杨凌 712100
2.西北农林科技大学资源环境学院,杨凌 712100
Recommended Citation
GB/T 7714
路 培,王林华,吴发启. 不同降雨强度下土壤结皮强度对侵蚀的影响[J]. 农 业 工 程 学 报,2017,33(8):141-146.
APA 路 培,王林华,&吴发启.(2017).不同降雨强度下土壤结皮强度对侵蚀的影响.农 业 工 程 学 报,33(8),141-146.
MLA 路 培,et al."不同降雨强度下土壤结皮强度对侵蚀的影响".农 业 工 程 学 报 33.8(2017):141-146.
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