Mathematical Problems in Engineering / 2020 / Article / Tab 1

Research Article

Study on the Evaluation Method of Subgrade Slope Green Protection Effect in Dry-Hot Valley of Sichuan-Tibet Railway

Table 1

Evaluation indexes and description.

First-level indexesSecond-level indexesIndex description

Soil matrix quality, C1Volumetric weight of soil, C11 (g cm−3)Refers to the mass of the soil per unit volume, reflecting the compactness of the soil
Total soil porosity, C12 (%)Includes capillary porosity and noncapillary porosity, reflecting the soil’s ability to breathe and permeate
Organic matter content, C13 (g kg−1)Refers to the amount of all carbon-containing organic compounds present in the soil
Duration of soil PWP, C14 (month)Refers to the time that the soil moisture is reduced to the humidity of the soil when the plant begins to wither
Soil infiltration rate, C15 (mm h−1)Refers to the amount of infiltration water per unit area of soil per unit time
Content of mineral nutrients, C16 (g kg−1)Refers to the content of various trace elements, such as total N, available P, and available K, in the soil
Ability of soil to preserve moisture and fertility, C17Reflects the soil's ability to sustain moisture and fertility
Soil expansion and contraction, C18Refers to the ability of the soil to expand and contract through water absorption and dehydration

Vegetation community quality, C2Coverage of vegetation, C21 (%)Ratio of the vertical projection area of vegetation (including leaves, stems, and branches) to the ground
Vegetation survival rate, C22 (%)Represents the number of plants that survived as a percentage of the total planted
Incidence of pests and diseases in vegetation, C23 (%)Refers to the percentage of vegetation with pests and diseases
Vegetation species richness index, C24Refers to the number of species in the community, reflecting the richness of vegetation species
Rationality of vegetation spatial collocation, C25 (%)Reflects the biological characteristics of the vegetation population and the reasonable degree of intraspecies and interspecies coordination
Ability of vegetation to resist drought and heat, C26Reflects the ability of vegetation to resist low temperatures, heat, and drought
Vegetation tolerance to barrenness, C27Reflects the ability of vegetation to grow in soils that lack nutrients and water

Protective performance of slope, C3Slope resistance to leaching erosion, C31Refers to the ability of the soil matrix to resist the infiltration of water and leaching of soil nutrients
Antiscouring ability, C32Refers to the ability of the slope as a whole to resist mechanical damage and movement such as that of rain and runoff
Ability of slope to protect against wind and sand, C33Refers to the ability of slopes to maintain soil and water and prevent severe weather such as sandstorms
Slope resistance to natural disasters, C34Refers to the ability of the slope to resist natural disasters, such as mudslides, earthquakes, landslides, floods, and collapses
Ability of slope to prevent water and soil loss, C35Refers to the ability of the slope to resist damage to soil and land productivity under external forces

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