本文選題：植被發(fā)育斜坡 + 淺層滑坡�。� 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：本文主要對(duì)云南省昌寧縣“9.16”群發(fā)性淺層滑坡與植被類型的關(guān)系進(jìn)行研究,旨在進(jìn)一步認(rèn)識(shí)山區(qū)流域環(huán)境下不同植被類型(草本、灌叢、喬本)對(duì)滑坡孕育的作用,探討不同植被類型對(duì)斜坡失穩(wěn)的影響。主要通過滑坡現(xiàn)場(chǎng)調(diào)查與滑體特征參數(shù)測(cè)量,對(duì)區(qū)域內(nèi)高植被覆蓋率下的滑體特征進(jìn)行分類分析,再對(duì)不同植被類型發(fā)育下滑體內(nèi)的植被根系含量與土體物理指標(biāo)進(jìn)行測(cè)定,測(cè)定內(nèi)容為不同深度下植被根系質(zhì)量密度、土體天然密度、土體天然含水率、土體飽和含水率、土體比重、土體孔隙率、土體有機(jī)質(zhì)含量、土體容重。分析不同植被類型滑體上各指標(biāo)隨土層深度變化的原因及其與植被根系深度間的關(guān)系。通過線性回歸和偏相關(guān)性分析,探討各指標(biāo)與滑體侵蝕特征間的關(guān)系。結(jié)果表明:區(qū)域內(nèi)草本植被的根系影響深度在0～30 cm,灌叢植被的根系影響深度在0～50 cm,喬本植被的根系影響深度在0～70 cm。研究成果對(duì)邊坡治理與水土保持具有一定的指導(dǎo)意義。本文獲得的主要結(jié)論如下:(1)相同條件下,不同植被類型發(fā)育的斜坡上,滑體特征呈現(xiàn)出明顯的差異性。(2)植被根系會(huì)對(duì)根系范圍內(nèi)的土體物理指標(biāo)產(chǎn)生影響,不同植被類型的根系在同一土層深度內(nèi)對(duì)土體物理指標(biāo)的影響存在顯著差異。(3)植被根系、土體有機(jī)質(zhì)含量、土體孔隙率對(duì)滑體侵蝕強(qiáng)度具有促進(jìn)作用,而土體天然密度與土體容重對(duì)滑體侵蝕強(qiáng)度表現(xiàn)出抑制作用。植被發(fā)育斜坡土體內(nèi),相鄰層間的土體物理指標(biāo)差值最大值對(duì)應(yīng)其根系含量減少速率最快的土層,在該深度范圍內(nèi),滑體侵蝕深度與侵蝕強(qiáng)度與根系延伸深度有著緊密的聯(lián)系。(4)降雨作用下植被“群根”的導(dǎo)流效果優(yōu)于“獨(dú)根”,導(dǎo)致淺層土體內(nèi)降雨聚集,土體指標(biāo)發(fā)生“突變”,引發(fā)植被發(fā)育斜坡失穩(wěn)。(5)滑坡前數(shù)日內(nèi)的長(zhǎng)時(shí)間降雨及前夜的高強(qiáng)度降雨是本次滑坡的主要誘發(fā)因素,而區(qū)域內(nèi)灌叢植被與喬本植被的高密度發(fā)育在較大程度上促進(jìn)了本次滑坡的產(chǎn)生。
[Abstract]:This paper mainly studies the relationship between the "9.16" mass shallow landslides and vegetation types in Changning County, Yunnan province. The purpose of this study is to further understand the effect of different vegetation types (herbs, shrubs, joben) on landslide inoculation in the environment of mountain area, and to explore the effect of different vegetation types on slope instability. The characteristics of the sliding body under the high vegetation coverage rate in the region are classified and analyzed, and the content of the root system and the physical index of the soil are measured. The content is the root mass density, the natural density of the soil, the natural water content of the soil, and the saturated water content of the soil. The proportion of soil mass, soil porosity, soil organic matter content and soil bulk density. The relationship between the changes of each index on the slide body of different vegetation types and the depth of the vegetation root is analyzed. The relationship between the indexes and the erosion characteristics of the slide body is discussed by linear regression and partial correlation analysis. The results show that the herbaceous vegetation in the region is in the area. The root influence depth is 0~30 cm, the root influence depth of the shrub vegetation is 0~50 cm, the root influence depth of the jo based vegetation is 0~70 cm., which has certain guiding significance to the slope control and soil conservation. The main conclusions of this paper are as follows: (1) under the same condition, the slope of different vegetation types and the characteristics of the slide body There are obvious differences. (2) the roots of vegetation will affect the physical indexes of soil in the root range, and there are significant differences in the influence of the roots of different vegetation types on the soil physical indexes in the same soil depth. (3) the vegetation root, the content of soil organic matter and the porosity of the soil have a promoting effect on the erosion intensity of the soil. The natural density of body and the bulk density of soil have an inhibitory effect on the erosion strength of the slide body. The maximum value of the physical index difference between adjacent layers corresponds to the fastest soil layer in the adjacent layers. In this depth, the depth of the erosion of the slide body is closely related to the depth of the root extension. (4) Under the action of rainfall, the diversion effect of "group root" is better than that of "only one", which leads to the accumulation of rainfall in the shallow soil soil, and the soil index has "sudden change", which causes the slope instability of the vegetation development. (5) the long time rainfall in the first few days of the landslide and the high intensity rainfall in the previous night are the main inducing factors of this landslide, and the irrigated vegetation in the region and Qiao Ben are in the region. The high density development of vegetation has promoted the occurrence of the landslide to a large extent.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q948

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本文編號(hào)：2057509