RCEES OpenIR  > 城市与区域生态国家重点实验室
Alternative TitleStudy on the relationship between vegetation pattern and soil water loss on slopes under artificial rainfall conditions in the Loess Plateau
Thesis Advisor卫伟
Degree Grantor中国科学院生态环境研究中心
Place of Conferral北京
Degree Name工程硕士
Degree Discipline环境工程
Keyword黄土高原,水土流失,模拟降雨,植被配置 loess Plateau,soil And Water Loss,vegetation Pattern,artificial Precipitation

      黄土高原地处干旱半干旱区,水土流失严重。该区降雨集中在7-9 月份,多
强烈,进一步加剧了水土流失。20 世纪90 年代以来,中国政府在该区实施了退
区,按照每个同物种斑块2.5m×1.5m 的面积栽种于各小区的上、中、下坡位,
木、草本植物)。按照从1 号到6 号小区、坡位从上到下的顺序依次为:1.乔-
      (3)对Philip 公式予以改进,构建了一种植被影响下坡面产流产沙数值模
      基于Philip 公式及其改进形式,可以对实验中降雨径流、产沙过程进行有效的预测和分析。通过修正原Philip 模型截留和填洼过程,本研究构建的改进的基
于Philip 模型的植被配置模式和雨强影响下的产流预测方法,该方法模拟效率较

Other Abstract

      The loess plateau, belonging to inner Asia, is one of the areas suffering the most serious soil and water loss in the world. On the results of worldwide researches we could find the climate, soil, vegetation factors as long as history and human activities have functioned together to induce soil erosion and water loss in the loess plateau.However, China government regarded this problem and has been pushing politics
such as afforestation, Soil and Water Conservation Projects from the 90th of last century, which have made significant growth of vegetation coverage and reduction of soil and water loss in this area.
      As for this research, we site in Anjiapo watershed, Dingxi City, Gansu Province,which has a typical loess plateau landscape and semiarid continental climate. Around this site there are abundant of loess slopes, ridges, hills and valleys, and precipitations always happen during the summer as heavy rains. That makes soil and water easy to lose. We hope to research the impacts of precipitation on different vegetation patterns
and their runoff and soil erosion on slope scale with artificial precipitation facilities, in order to find out the best arrangement of different vegetation patches on the loess slopes, and provide planting and soil-water retaining solution for authorities with limited money, human resources and plant species available.
      The experimental site is divided into six plots with the same slope direction. the same slope area of 7.5m *1.5m, and the slope of 25°. Each district is surrounded by concrete walls to prevent water permeability. Artificially cultivated vegetation species are Platycladus orientalis, Caragana korshinskii and Agropyron cristatum. The vegetation age is about 6-7 years. They are planted on the upper, middle and lower
slopes of each plot according to the area of 2.5m *1.5m per patch of the same species, so that each plot has three different combinations of vegetation, representing three different vegetation types (arbors, shrubs, herbs). According to the order of plot 1 to 6 and slope position from top to bottom: 1. arbor-shrub-herb, 2.arbor-herb-shrub, 3.shrub-arbor-herb, 4.shrub-herb-arbor, 5.herb-shrub-arbor, 6.herb-arbor-shrub. Artificial rainfall using Norton artificial precipitation equipment in the United States can better simulate the falling form and momentum of natural
rainfall, and can set up a variety of rainfall intensity. In this experiment, there are three kinds of rainfall intensity: small, medium and large. The ratio of rainfall intensity is 1:2:4.
      Fifty-four sets of runoff and sediment yield data were obtained, which belonged to six plots with three rainfall intensities, integrated environmental factors, vegetation factors and time parameters.
      The results showed that there was a significant negative correlation between runoff and biomass at the uphill site, and there was a relatively minimum runoff and sediment yield/rate in plots 3 and 4. Under the same total biomass allocation, the shrub with the lowest biomass had the best effect of reducing runoff and sediment at the uphill site.
      The Philips formula and its improved form can effectively predict and analyze the rainfall runoff and sediment yield process in the experiment. Through the modification of the original Philips model in the process of interception and filling, the improved vegetation pattern based on Philips model and the prediction method of runoff yield under the influence of rain intensity are constructed in this study. The improved method has high simulation efficiency, and it has certain promotion value.
      This conclusion can be used to guide the planting of artificial vegetation by planting low biomass species on the top/upper slope and planting large biomass trees on the middle and lower slope, which is conducive to the prevention and control of soil erosion on slope land.

Document Type学位论文
Recommended Citation
GB/T 7714
冯欣然. 黄土高原模拟降雨条件下坡地植被配置模式与水土流失关系研究[D]. 北京. 中国科学院生态环境研究中心,2019.
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