| Since the industrial revolution,human needs for land have increased,and changes in land use patterns have been combined by various factors.As an important part of the ecosystem,land contains rich and diversified ecological values,and as humans influence the type of land use,the value of ecosystem services will also change.At present,research on land use structure has become very important.The land-use structure of a particular region has adapted to the requirements of human society since the advent of mankind.The changes in the industrial revolution and land-use structure can be considered as a very important global process in the recent past.Today’s land use can be interpreted as human intervention in the landscape.For a long time,the impact of scale has been an important topic in ecological research,and there is sufficient evidence that many spatial patterns in ecology are highly dependent.Ecosystem services rely on dynamic processes that work and interact at different scales,and a clear understanding of how best to study these services and explain their complex spatial and temporal relationships remains the subject of ongoing research.Humans use the ecosystem services to sustain society,and these services are especially important for those who rely on subsistence.Ecosystem service assessments can be used to compare the impact of land use/cover change on different types of natural capital,making understanding of ecosystem services an important area of research.In recent years,ecosystem services have been declining in many parts of the world,which poses a major challenge to livelihoods and human well-being,so policymakers should pay more attention to ecosystem services with a view to providing relevant information for conservation and development strategies.Based on the research on land use type data of Jiulong County in Ganzi Prefecture from 2012 to 2017,this study explored the land use structure characteristics of Jiulong County in the past six years and analyzed the land use concentration.This study studied the value of ecosystem services of land use types and the total value of ecosystem services in Jiulong County during 2012-2017 and its changes,with a view to better to understand the changes in land use types in Jiulong County,Ganzi Prefecture,and to provide some reference for the Gansu Prefecture government’s land use decision-making and implementation of land use type changes in similar areas.This study mainly draws the following conclusions:(1)The land use type of Jiulong County in Ganzi Prefecture accounted for the largest area of the total area of Jiulong County in 2012-2017,accounting for 48.55%and the area was 328316.35 hm~2.In 2013,the land use types in Ganzi Prefecture were mainly forest land,grassland and other land.The area of each land use type is 328278 hm~2,223941.65hm~2 and 110692.3 hm~2,accounting for 48.55%,33.12%and 16.37%respectively.In 2014,the grassland area of Jiulong County was 223,949.43 hm~2,accounting for 33.12%.In 2015,land use types in Ganzi Prefecture were mainly forest land,grassland and other land.The area of land use types was 328,306.81 hm~2,223,946.65 hm~2 and 110,707.12 hm~2,accounting for 48.55%,33.12%and 16.37%,respectively.In 2016,the land use type of Jiulong County in Ganzi Prefecture accounted for the largest area of the county.In 2017,the land use types in Ganzi Prefecture were mainly forest land,grassland and other land.The area of each land use type was 328301.19 hm~2,223944.63 hm~2 and 110711.11 hm~2.From the perspective of space,there is no significant change in the land used for cultivated land,garden land,forest land,grassland,transportation land,waters and water conservancy facilities and other land in Jiulong County of Ganzi Prefecture from 2012 to 2017.(2)There was no significant change in the land use area of grassland and grassland in Jiulong County of Ganzi Prefecture during 2012-2013,while the area of urban and industrial and mining land increased the most,up 5.19%.In 2013-2014,the largest decline in land use area in Jiulong County was for urban and industrial and mining land,with a decrease of 4.64%.In 2014-2015,there was no significant change in the land use area of forest land and grassland in Jiulong County of Ganzi Prefecture.There was no significant change in the area of forest land,grassland waters and water conservancy facilities and other land areas during 2015-2016.The area of urban,industrial and mining land and transportation land increased correspondingly during the year,with an increase of 0.11%and 0.05%respectively.In 2016-2017,the largest decline in land use area in Jiulong County was cultivated land,with a decrease of 0.06%.(3)The land use dynamics of forest land,grassland and other land in Jiulong County of Ganzi Prefecture did not change significantly during 2012-2017,and the area of cultivated land and garden land decreased significantly.The single land use dynamic degree was-0.08.And-0.06.The area of urban and industrial and mining land,transportation land and waters and water conservancy facilities has increased to varying degrees,and the single land use dynamics are 0.47,0.11 and 0.02 respectively.The comprehensive land use index of Jiulong County in Ganzi Prefecture in 2012 and 2014 was the lowest at 186.82,and the highest in 2013 was 186.85.The comprehensive index of land use in 2015,2016 and 2017 was 186.83.In 2012-2017,there was no significant change in the land use type diversification index of Jiulong County in Ganzi Prefecture,both of which were 0.63.There was no significant change in the land use type dominance index of Jiulong County in Ganzi Prefecture from 2012 to 2017,both of which were 0.97.The land use type uniformity index of Jiulong County in Ganzi Prefecture is between 47.50-47.51.(4)There was no significant change in the value of ecosystem services for various types of land use in Jiulong County of Ganzi Prefecture during 2012-2017.The value of cultivated land ecosystem services in the six years was 0.27 billion yuan.The value of ecosystem services was 0.04 billion yuan,6.347 billion yuan,1.435 billion yuan,266million yuan and 0.41 billion yuan respectively.During 2012-2017,the value of ecosystem services for near-waters and water conservancy facilities increased significantly,rising by374811.46 yuan.The value of ecosystem services in cultivated land,garden land,forest land,grassland and other land decreased by 127788.87 yuan,13899.87 yuan,293095.25yuan,33441.93 yuan and 1571.02 yuan. |
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