Gisk () g Desertification, as defined by ISSN: X United Nations Conference, has a strong impact on hydrological conditions, environment and development. The ecological environment in the middle and lower reaches even leads to land degradation in arid areas. The repeated occurrence of the Yellow River drying up since the semi-arid and semi humid arid area is the result of the joint action of many factors, including climate change, which leads to the exchange of soil between human beings in the source area of the Yellow River In depth study on the ecological environment problems of desertification rivers: in the northeast of Qinghai Province, the geographical location and ecological environment of Tibet are not only a special ecological problem of Qinghai Province, but also a major threat to its ecological environment.
In recent years, due to natural factors and human activities, Tibet's geographical location and ecological environment problems are not only a special ecological problem in Qinghai Province, but also a major threat to its ecological environment In the past, the research on desertification mainly concentrated in Gonghe basin, lacking systematic study on the distribution of land desertification in the whole region. According to the field survey in September and Landsat, the desertification degradation rate is very fast TM images and band data show that the desertification land in the study area is mainly concentrated in Gonghe Basin and hilly plain area. In the source area of the Yellow River, the total area of desertification land is km or total area.
吉斯克（）G X我是ISSN：X联合国会议所定义的荒漠化对水文条件有着强烈的影响，对环境和发展的影响，中下游的生态环境甚至导致干旱地区土地退化，半干旱半湿润干旱区年代以来黄河干涸的反复发生是多种因素共同作用的结果，包括气候变化，导致了对黄河源区人类交流土地沙漠化生态环境问题的深入研究河流：青海东北部中国科学院中国科学院西藏高原冯建民王桃谢长卫寒冷干旱区环境与工程研究所西藏的地理位置和生态环境问题不仅是青海省的一个特殊的生态问题，而且也是其生态环境的一大威胁近年来，由于自然因素和人为因素共同作用，沙漠化退化速度非常快，荒漠化程度居首位，以往对荒漠化的研究主要集中在共和盆地，缺乏系统的研究全区土地荒漠化分布，根据9月份实地调查和Landsat TM影像和波段资料，研究区沙漠化土地主要集中在共和盆地和丘陵平原区，在黄河源区青藏高原东北部，沙漠化土地总面积为公里或总面积。
E4be5 is the fundamental cause of the formation and expansion of desertification. The desert ecosystem caused by man-made destruction (including desert, Gobi system, grassland, forest and wetland system in arid and semi-arid areas) is a water resource system. The development and utilization of biological resources and land resources have led to the inherent disorder, stability and balance within the system.
In the past, we planted trees and grasses, and adopted biological measures In fact, it is precisely because of the destruction of desert ecosystem that we have built "Three North" shelterbelts and carried out sand control projects, but on the whole, we have failed to stop the pace of desertification expansion. It can be said that the real cause of Sandstorm in the past half century is that we have built "Three North" shelterbelts and implemented sand control projects It is often not that the artificial vegetation construction is too little, but the local improvement of the small environment due to the destruction of natural vegetation offsets the whole inverter environment.
Desertification is an increasingly serious problem in recent years. From the table, we can see the development trend of desertification in a region. In s, the desertification area was a square kilometer in s, and the desertification area increased rapidly to square kilometers in the following ten years, and the number rose slowly.
Compared with the previous 10 years, the area of desertification land finally reached square kilometers. From s to s, the frequency of Sandstorm in this area is also shown. The frequency of sandstorm rises sharply, because the area of desertification is slowly increasing, and the frequency of desertification has increased by about 10%.
However, desertification is obviously an international problem. Now it is caused by the reduction of forest and vegetation, and the water on the ground is preserved by plants. Therefore, if there is not enough, the desertification area will be increased slowly Plants, land may turn into desert.
Desertification can cause severe weather such as sandstorms, even change the climate of a region, and also destroy the diversity of animals and plants. So far, there is no effective way to solve this problem thoroughly, but there are many things that human beings can do to prevent desertification, from planting trees more seriously or stopping felling trees, there is still a long way to go.