Evaluation of the importance of ecosystem services in the upper reaches of the tarim river

Abstract

Using RS and GIS technology, the four sub-ecosystem service functions of water conservation, soil and water conservation, windbreak and sand fixation, and biodiversity, which are the most significant ecological factors in the study area, are selected to establish a model and method for evaluating the importance of ecosystem services in arid and semi-arid areas. A comprehensive study of the desert oasis eco-city in the upper reaches of the tarim river in southern xinjiang, quantitatively and qualitatively reveals the importance of ecosystem services in the study area and the spatial distribution laws along the upper reaches of the tarim river. concluded as follow: (1) The area of extremely important water conservation area accounts for 14.9% of the total area of the study area. The extremely important areas are mainly distributed in patches in the southern tianshan mountains and the source of tarim river; (2) The area ratio of extremely important areas for water and soil conservation is 17.9%, and the extremely important areas are mainly distributed in wensu county at the southern foot of the tianshan mountains; (3) The area ratio of the most important areas for windbreak and sand fixation is only 0.4%, and the most important areas are mainly distributed along the southern side of the tarim river in alar city; (4) The area ratio of the most important areas for biodiversity is 67.9%, and the most important areas are distributed in a belt on both sides of the tarim river basin and around the reservoir.(5) The evaluation results of the ecosystem service function using graphics overlay are: extremely important accounted for 55.6% of the total research area, highly important area ratio was 26.1%, medium important area ratio was 14.3%, and general important area ratio was 4.1%.Ecosystem service function is the natural environmental conditions and utility of human survival formed and maintained by the ecosystem and its ecological processes. 1997 costanza et al. The value estimation of natural capital of global ecosystem service is studied, and strongly promotes the economic value evaluation research of ecosystem service function. Since then, many scholars have applied Costanza and other methods to study the service value of different ecosystems in different regions. During the same time, Chinese scholars serve the national land ecosystem and forest, grassland, farmland, wetlands and rivers. A large number of deep research has been carried out on the service functions of ecological system types. It has improved people’s understanding and understanding of the research of regional ecosystem service function, but at the same time.