Study On The Distribution Effect Of Vegetation In Loess Slope

China’s eco geological environment relatively poor region of northwest loess region in recent years in the national land is forest policy support, the ecological environment in loess area compared to previous although have been greatly improved, but with the large scale economic construction in the area, and in extreme climate anomalies, resulting in the ecological environment is very fragile. In order to protect the harmony between the environment and the ecology, the research on the vegetation growth of the loess slope is imminent.This paper takes the natural loess slope of Yanan as the research object, and carries on the field investigation for 20 days.. According to the natural condition features of landform, climate and other natural conditions in Yanan, the route takes Yanan as the center, and divides into 5 routes, and surveys 323 natural slopes.. Explore different slope vegetation growth relationship between status and protection effect, analyzes the different slope vegetation species and growth conditions, puts emphasis on the research of the Northern Shaanxi area of Artemisia vegetation. According to the principle of least square method, the fitting of the data is carried out by using EXCEL table. The fitting results are analyzed and the following conclusions are obtained.:(1) The main species of the slope plants in Yanan are mainly cold drought tolerance and suitable for the adaptability of the plant.. The plants of the genus Artemisia ordosica Artemisia as the representative of the living conditions, more bad, the more obvious advantage.(2) When the proportion of loess slope increased, soil water and plant adhesion ability is reduced accordingly, reduce the number of plants, species distribution differences in the structure and proportion of the increase, but Artemisia plants increase accordingly.(3) The average height of Artemisia ordosica decreased with the increase of the slope and soil moisture decreased.(4) Through investigation and research, the appropriate plant types and plant combinations of different slope slopes are obtained, which provide a theoretical basis for the research on the loess slope plant protection.