Abstract:
150 Regiment is located in the aeolian desert and desert crisscrossed zone at the northern end of Mosuowan Shihezi City, Xinjiang, 70 km into Gurbantunggut Desert. Desertification land area accounts for 12% of the available land area. The study of the temporal and spatial variation trend of vegetation coverage and the reasonable evaluation of vegetation growth can provide scientific guidance for the ecological environment protection, shelter forest construction and long-term vegetation sustainability in the study area. In this paper, the spatial and temporal changes of vegetation coverage in the past 30 years of 150 Regiment were investigated by using the improved pixel dichotomous model combined with the land use types of the groups, and the vegetation status was evaluated with the planting density, canopy density, porosity and survival rate of the shelter forest. The results show that: ① In the past 30 years, the area with low vegetation coverage has decreased by 25.41%, that with medium vegetation coverage has increased by 7.47%, and that with high vegetation coverage has increased by 17.93%. The areas with severe degradation accounted for 0.81%, those with mild degradation accounted for 31.58%, those with no change accounted for 1.63%, those with mild improvement accounted for 51.28% and those with high improvement accounted for 14.69%. ② In the past 30 years, the overall vegetation of 150 Region has developed towards a good trend, with vegetation degradation in the northern region and significant improvement in the southern region. The possible reason is that the wind-sand hazards of shelterbelts in the southern region are weaker than those in the northern region, and the population in the southern region is more concentrated, the vegetation is closer to the human settlements, and the forest belt can be supplied by the water in the city. Therefore, under the same natural conditions, the vegetation in the southern region grows better than that in the northern region.