Study On Forest Vegetation Distribution And Forest Resources Change Monitoring In Linzhi Area

Forest is the basis for the survival of human beings and all kinds of organisms,is the most abundant and stable resource and energy storehouse in nature,which plays an important role in maintaining ecological environment and maintaining ecology balance and the basic environment of human survival and development.The rapid development of remote sensing technology has brought new changes to forest resource information,which provides a powerful detection means for forest resources investigation,and has become the most powerful tool for analyzing,monitoring and evaluating forest resources change and ecological environment in large scale area.Linzhi is located in the southwest border of China,has a rich vertical natural belt system,many rare plants and retained intact the original forest to make this a "natural museum of Nature." Based on the application demand of national Forest resources Survey industry and the "China Forest Vegetation Survey" project of National Science and Technology 92 basic work,this paper analyzes the forest vegetation types extraction and forest resources and land use changes in Linzhi of Tibet Autonomous Region in the past 25 years,and three-phase dynamic change monitoring.The aim is to make reference to the implementation of forestry engineering and the optimal allocation of forest resources.The main conclusions of this paper are as follows:(1)Linzhi forest vegetation has obvious vertical distribution characteristics,forest vegetation diversity and mainly coniferous forest,at the same time,the distribution of forest vegetation has obvious geographical characteristics and regional differences.The total forest area of Linzhi is 2.1705 million hectares,the main forest vegetation types are fir forest,spruce forest,Yunnan pine forests and other 11 categories,the total classification accuracy is 78.2%.Fir forest area accounted for 44.7% of the total area;the Spruce forest area accounted for about 6.3%,the Alpine pine forests accounted for about 12.5% of the total area,Yunnan pine Forest accounted for 15%,Birch accounted for about 3.4%,and the Cypress was about 1.9% of the total area,Quercus was 4.7%;Motuo green and prickly forest accounted for 0.05% of the total area.,the middle-level tree and the big fruit banyan accounted for 0.4%,the Alpine pine and the broad-leaved mixed forest accounted for 4.2%;other hard and broad categories accounted for 16% of the total area.(2)The spatial and temporal dynamics of forest and land use in the last 25 years of Linzhi are based on the 2000-year boundary,after the decline of woodland area,the basic maintenance,the grassland area reduced after a large decrease,and the amount of arable land 11 times times more substantial increase after a small decrease,the water area substantially increased after the basic maintenance of the same,The unused land has been substantially increased and remained unchanged.The areas where forest resources are reduced are concentrated in Chayu County,Bomi County and Gongbo’gyamda County,most of which are located at the junction of woodland and other land,and the marginal part of woodland is especially prominent.The main reasons for the decrease of woodland are the natural environment and human activities.