本文選題：優(yōu)先流 + 土壤細根��； 參考：《南京林業(yè)大學》2015年碩士論文

【摘要】：土壤優(yōu)先流不僅在土壤水源涵養(yǎng)方面有重要作用,同時在加重地下水污染、山體滑坡、泥石流的發(fā)生等方面也存在一定的負面影響,因此土壤優(yōu)先流越來越被人們重視。本研究以浙江鳳陽山4個典型森林類型為對象,通過野外測定、染色示蹤試驗,研究土壤孔隙、土壤結(jié)構(gòu)、土壤有機質(zhì)含量、根系特征、石礫質(zhì)量及表面積等對土壤優(yōu)先流的影響及作用機制,研究結(jié)果如下:(1)林木細根(根徑:0.6mm、0.6mm~1.2mm、1.2mm~1.8mm和1.8mm)的根長密度基本表現(xiàn)為隨土層深度的增加而減少,根表面積和根體積分布也表現(xiàn)出相同的變化規(guī)律。(2)土壤總孔隙度、非毛管孔隙度隨著土壤深度的增加而減小,土壤有機質(zhì)含量、土壤大團聚體數(shù)量隨土層深度的增加而減少,土壤結(jié)構(gòu)變差。(3)相鄰微區(qū)域,根徑0.6mm的根長密度、根表面積、根體積、根尖數(shù)、根分叉數(shù)、石礫質(zhì)量、石礫表面積和非毛管孔隙度基本表現(xiàn)出優(yōu)先流區(qū)基質(zhì)流區(qū)。(4)基于主成分分析,第一主成分反應出根系特征指標對有優(yōu)先流路徑的影響作用,第二主成分反應出石礫含量對優(yōu)先流路徑的影響作用,第三主成分分反應出非毛管孔隙和石礫含量對優(yōu)先流路徑的綜合影響作用,第四主成分反應出分形維數(shù)對優(yōu)先流路徑的影響作用。通過進一步的計算檢驗,發(fā)現(xiàn)75%樣地綜合得分表現(xiàn)為優(yōu)先流區(qū)基質(zhì)流區(qū)�？梢哉J為根徑0.6mm的根長密度、根表面積、根體積、根尖數(shù)、根分叉數(shù)、石礫質(zhì)量、石礫表面積、非毛管孔隙度為影響優(yōu)先流的主要因素。
[Abstract]:Soil preferential flow not only plays an important role in soil water conservation, but also has some negative effects on the aggravation of groundwater pollution, landslides and debris flow. Therefore, the soil preferential flow has been paid more and more attention. This study is based on 4 typical types of forest types in Fengyang mountain, Zhejiang. The effects and mechanisms of soil porosity, soil structure, soil organic matter content, root characteristics, gravel quality and surface area on soil priority flow were studied. The results were as follows: (1) the root length density of the tree root (root diameter: 0.6mm, 0.6mm~1.2mm, 1.2mm~1.8mm and 1.8mm) decreased with the increase of soil depth, and the root table The area and root volume distribution also showed the same change law. (2) the total porosity of soil, non capillary porosity decreased with the increase of soil depth, the content of soil organic matter, the number of soil aggregates decreased with the increase of soil depth, and the soil structure became worse. (3) the root length density, root surface area and root body of the root diameter 0.6mm in adjacent microregions. Product, root tip number, root bifurcation number, gravel quality, gravel surface area and non capillary porosity basically show the matrix flow area in the priority flow area. (4) based on the principal component analysis, the first principal component reacts the effect of the root characteristic index on the preferential flow path, and the second main components reverse the effect of the gravel content on the priority flow path, and third main main components. The effects of non capillary pores and gravel content on the preferential flow path are synthesized. Fourth main components reflect the effect of fractal dimension on the preferential flow path. Through further calculation and test, it is found that the comprehensive score of the 75% samples is the matrix flow area of the priority flow area. The root length density and the root surface can be considered as the root diameter 0.6mm. Product, root volume, root tip number, root fork number, gravel quality, gravel surface area and non capillary porosity are the main factors affecting preferential flow.
【學位授予單位】：南京林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S714

【參考文獻】

相關(guān)期刊論文 前4條

1 張英虎;牛健植;汪西林;韓旖旎;譚晶平;杜曉晴;;土壤溶質(zhì)優(yōu)先遷移影響因素研究進展[J];灌溉排水學報;2013年03期

2 劉亞平;陳川;;土壤非飽和帶中的優(yōu)先流[J];水科學進展;1996年01期

3 牛健植;余新曉;張志強;;優(yōu)先流研究現(xiàn)狀及發(fā)展趨勢[J];生態(tài)學報;2006年01期

4 孫龍;張洪江;程金花;王彬儼;陸曉宇;王賢;;柑橘地土壤大孔隙與優(yōu)先流的關(guān)系研究[J];水土保持通報;2012年06期

相關(guān)博士學位論文 前1條

1 程金花;長江三峽花崗巖區(qū)林地坡面優(yōu)先流模型研究[D];北京林業(yè)大學;2005年

相關(guān)碩士學位論文 前1條

1 朱蔚利;林木細根和土壤特性對優(yōu)先流運移的影響[D];北京林業(yè)大學;2012年

，

本文編號：1914352