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土壤理化及力学性质对干热河谷台地边坡沟蚀发育的影响
Alternative TitleImpacts of soil physical-chemical and mechanical properties on gully erosion development on terrace slopes in dry-hot valley region
杨丹1,2; 熊东红3,4; 刘守江1,2; 张斌1,5
Corresponding Author杨丹
2018
Source Publication农业工程学报
ISSN1002-6819
Volume34Issue:4Pages:170-176
SubtypeArticle
Contribution Rank3
Abstract金沙江干热河谷土地整理台地边坡沟蚀发育严重,水土流失强烈,高投入的土地整理工程效益难以发挥,严重威胁着该区的生态安全和社会经济发展。为查明干热河谷土地整理台地边坡沟蚀发育关键影响因子、防治台地边坡沟蚀发育,该研究采用野外实地测量法和实验室测定的方法,研究了干热河谷土地整理台地边坡的沟蚀发育形态特征,系统分析了土壤理化性质和力学性质对台地边坡沟蚀发育形态特征的影响。结果表明:1)非毛管孔隙度是影响台地边坡沟蚀发育形态特征的主要指标,但非毛管孔隙度对台地边坡沟蚀发育宽度、深度、截面积、密度以及割裂度的影响形式和影响程度有较大差异。2)抗剪强度仅对台地边坡沟道深度和截面积影响显著,而对沟道宽度、密度和割裂度的影响甚微。3)分散率对台地边坡沟道宽度和割裂度的影响较为明显,对沟道深度、截面积和密度无显著影响。4)沟道宽度和密度均主要受非毛管孔隙度控制,割裂度受分散率的影响最大,但沟道深度和沟道截面积受土壤性质的影响相对较弱。
Other AbstractGully erosion on land consolidation terrace slopes (LCTSs) is well developed in Jinsha Dry-hot valley region, and has caused serious soil losses. According to the field investigation, the soil erosion modulus caused by gully erosion on LCTSs can up to 8 000 t/(km~2*a), which can lead continuous increase of sediment content in Jinsha River and its tributary rivers. Moreover, the development of gully erosion on LCTSs can severely destroy terrace land systems and hamper the exertion of ecological and economic benefits in the study area. In order to explore the key controlling factors of gully erosion development on LCTSs, and to find effective prevention and controlling measurements for gully erosion on LCTSs, a series of field investigations and laboratory measurements have been conducted between March and April 2016. Width, depth, sectional area, density and lacerate-degree of gullies in studied spots had been obtained by directly measuring and calculating based on related theoretical formula. In addition, bulk density, total porosity, capillary porosity, non-capillary porosity, shear strength (including cohesion and internal friction angle) and dispersion rate of studied soil samples were determined by conventional methods in soil science. On the basis of that, in this study, we analyzed the morphological characteristics of gullies on LCTSs, and explored the influence of soil physicochemical properties and mechanical properties on gully erosion development on LCTSs. The results showed that: 1) The non-capillary porosity was the major factor that affected the development of gully morphological characteristics on LCTSs. Non-capillary porosity had significant influence on width, depth, sectional area, density and lacerate-degree of gullies, while the impact manner and degree of non-capillary porosity on above-mentioned morphological characteristics were very different; 2) Soil shear strength only affected depth and sectional area of gullies, and had little influence on width, density and lacerate-degree of gullies on LCTSs. The impact manner of soil cohesion on depth and sectional area was similar, from which both fitting functions were cubic curves. In contrast, soil internal friction angle just affected the gullies' depth, and a quadratic function can be found between soil internal friction angle and gullies' depth; 3) Soil dispersion rate exerted obviously role in the changing of width and lacerate-degree of gullies, among which an exponential growth function can be found between gully width and soil dispersion rate, as well as a power function was built between lacerate-degree of gullies and soil dispersion rate. However, no significant influence had been detected for soil dispersion rate on depth, sectional area and density of gullies on LCTSs; 4) Width and density of gullies were mainly controlled by non-capillary porosity, and soil dispersion rate had more strong effect on lacerate-degree of gullies than other soil properties, while soil physicochemical properties and mechanical properties only had very slightly effect on the depth and sectional area of gullies on LCTSs. According to the above-mentioned analysis, it can be found that the impact manner and degree of soil properties on different morphological characteristics of gullies on LCTSs were very different, and different soil properties also had differential contribution in the development processes of gullies on LCTSs.
Keyword土壤 侵蚀 土地整理 沟道侵蚀 形态特征 干热河谷
DOI10.11975/j.issn.1002-6819.2018.04.020
Indexed ByCSCD ; EI
Language中文
CSCD IDCSCD:6170879
EI Accession NumberAccession number: 20182405309251
Citation statistics
Cited Times:3[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/23035
Collection山地灾害与地表过程重点实验室
Affiliation1.西华师范大学国土资源学院;
2.西华师范大学嘉陵江流域研究所;
3.中国科学院山地灾害与地表过程重点实验室;
4.中国科学院水利部成都山地灾害与环境研究所;
5.西华师范大学地表过程与环境变化研究所
Recommended Citation
GB/T 7714
杨丹,熊东红,刘守江,等. 土壤理化及力学性质对干热河谷台地边坡沟蚀发育的影响[J]. 农业工程学报,2018,34(4):170-176.
APA 杨丹,熊东红,刘守江,&张斌.(2018).土壤理化及力学性质对干热河谷台地边坡沟蚀发育的影响.农业工程学报,34(4),170-176.
MLA 杨丹,et al."土壤理化及力学性质对干热河谷台地边坡沟蚀发育的影响".农业工程学报 34.4(2018):170-176.
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