Ecological Health Assessment Of Sanjiangyuan National Park

With the enhancement of human activities,human impact on the ecosystem has become more and more obvious,and the health problems of ecosystems have gradually attracted the attention of countries,scholars and the public.Sanjiangyuan National Park is located in the Sanjiangyuan area in the southern part of Qinghai Province.Its climate is sensitive and its the ecological environment is fragile.The health of its ecosystem is not only related to the people’s livelihood in the province,but also closely bound up the strategy of achieving sustainable development and building a large ecological country.Since development of the park sustained for many years,the ecological environment has been seriously degraded,land desertification,glacial retreat,rodent damage,and water conservation capacity have been continuously reduced.Under this background,it is particularly important to have the health assessment of the Sanjiangyuan National Park ecosystem.This study uses the park as an evaluation unit to build a pressure-state-response model based on remote sensing image data,meteorological data,landscape data and social statistics,and study the ecological health status of Sanjiangyuan National Park in 2005,2010 and 2015.Based on the health status chart,the spatial and temporal changes of ecological health in Sanjiangyuan National Park in different periods were analyzed to compare the ecological health changes of the park in 2005,2010 and 2015.The results are as follows:(1)In 2005,2010 and 2015,the ecological health comprehensive indexes of the Yangtze River Source Park,the Lancangyuan Park and the Yellow River Source Park of Sanjiangyuan National Park were 0.532,0.521,and 0.536,respectively.The overall ecosystem health status of the study area was from unhealthy to healthy range.In term of separating the park area,the ecological health level of the Yellow River Source Park was the highest from 2005 to 2015,followed by the Lancangyuan Park,and the Yangtze River Source Park had the lowest level of ecosystem health.(2)From 2005 to 2010,the health status of Sanjiangyuan National Park remained largely unchanged.The health conditions in the eastern and southeastern areas of the park were mainly improved.The deteriorating areas were scatteredthroughout the park in spots;the Sanjiangyuan from 2010 to 2015 The overall health of the national park has improved,mainly in the southeastern part of the park.In terms of the park,the overall ecological health status of the three parks has improved.The improvement of the Lancangyuan Park is the most obvious,followed by the Yangtze River Source Park,and the Yellow River Source Park still maintains a high level of ecological health.