| Mountain area is the basic framework that constitutes the surface environment and geomorphologic type,and is an important part of terrestrial ecosystem.Its complex vegetation type and topographic fluctuation feature are the best regional unit for studying global change,which plays a role in amplifying the signal of climate change.Advantages is located in the north subtropical south warm temperate transitional zone in China,more of a north-south through the area,has significant transitional climate,advantageous geographical location,research value,extremely of ups and downs in the area of landscape types,complex and diverse vegetation types,rich animal and plant resources,biodiversity is the transition zone of natural treasure house.With the rapid development of social economy,the ecological environment in the mountainous area is facing great pressure,decrease of biodiversity,soil erosion was significantly increased and reduced vegetation coverage and soil erosion phenomenon in a series of environmental problems,such as mountain ecological environment sustainable development,damaged regional ecosystem balance,has a great negative impact on the human production and living.Selected articles 2000 to 2015,such as four period of land use/cover data,combined with the DEM data,social and economic data,soil type,basin,partition and so on the many kinds of data,using GIS technology,Fragtates 4.2,value equivalent method and human activity intensity index model of Funiu district and watershed division nearly 15 years of land use quantity,structure,dynamic analysis,identify the Funiu the driving factors of land use/cover change,the comprehensive analysis of the ecological environment effect of LUCC change,for the region ecological environment construction and the social and economic sustainable development to provide the reference,Relevant conclusions of this study are as follows:(1)From 2000 to 2015,land use types in Funiu mountain area are mainly forest land,grassland and cultivated land,accounting for more than 90% of the total area.The land use types in the four watershed zones are all dominated by forest land,grassland and cultivated land.During the study period,the land use/cover data and structural changes in each watershed region are different.The overall performance is the main change trend of increasing construction land and water area and decreasing cultivated land area.In turn to the regional comprehensive land use dynamic degree rank for Danjiangkou basin(3.27%)> Yiluohe basin(3.25%)> Funiu region(3.22%)>Tangbaihe basin(3.18%)> Wangbengqujianbeian basin(3.16%),showed that Danjiangkou region and Yiluohe basin land use/cover change is more intense,Tangbaihe basin and Wangbengqujianbeian basin land use/cover change is relatively stable.(2)There are differences in driving mechanisms of land use/cover change in Funiu mountain area.In terms of elevation grading,500-1000 m is the main elevation grading in the study area,accounting for 39.17%.The change of land use/cover in the low-altitude area is significantly higher than that in the high-altitude area.In the elevation classification of <200m,the decrease of forestland is 17.46%,and the increase of 200-500 m is 3.46%.Grassland and water area decreased by 27.84% and increased by 37.33% in the elevation classification <200m respectively,and construction land increased by 1010.59% in the elevation classification of >1500m.In terms of slope grading,15-25° is the main slope grading in Funiu mountain area,with the patch amount accounting for 31.08%,and the change range of land use/cover in the slope grading of 15-25° is significantly higher than other slope grading,with the largest increase of construction land and the second largest increase of water area.In terms of soil types,the decrease of cultivated land area in alluvial soil,yellow brown soil and yellow-brown soil was 18.55%,5.93% and 5.04% respectively.The increase rate of forest land in yellow brown soil was 0.49% and the decrease rate of brown soil was 0.32%.The grassland showed the most significant increase(5.49%)and the largest decrease(2.67%)in cinnamon soil.The increase and decrease of water area was most significant on the cinnamon soil and cinnamon soil.The largest increase of construction land was in brown soil(355.27%),indicating that there were differences in the change range of land use/cover in different soil types.In terms of road traffic factors,cultivated land has the most obvious reduction at 2400 m from road traffic and the largest increase at 1800m;water area has the largest reduction at 1800 m from road traffic and the largest increase at 2400 m from road traffic.Other land types show dynamic change characteristics in different road traffic elements,which are reflected by means of attraction and exclusion.(3)There was significant heterogeneity in the landscape pattern of Funiushan region and various watershed regions,with the largest number of patches in Yiluohe basin(2503),the second largest number in Tangbaihe basin(1909),and the smallest number in Danjiangkou basin(951)in 2015.The degree of interaction between landscape types in Wangbengqujianbeian basin is the highest and the degree of interaction between landscape types in Funiu mountain area is the lowest.The degree of landscape fragmentation in Danjiangkou basin is low,and the degree of landscape fragmentation in the north bank of Wangbengqujianbeian basin section is high.Tangbaihe basin patch shape is the most disordered,Dangjiangkou basin patch shape is the most regular.(4)Funiu area ecosystem service value in 2000-2015 an increase of 51 million yuan,of which the Yiluohe basin to reduce 103 million yuan,the king of mussel interval north shore an increase of 078 million yuan,Dangjiangkou basin reduce tang river increased by 108 million yuan and 018 million yuan,that Yiluohe and Dangjiangkou basin ecological environmental quality is on the decline,and needs to improve the ecological environment,Wangbengqujianbeian basin and Tangbaihe basin ecological environment was improved;In terms of the value of individual ecosystem services,soil formation and conservation,water conservation,waste treatment and biodiversity conservation are the major contributors to the total value of ecosystem services,accounting for 45% of the total value.(5)From 2000 to 2015,the area with low ecological risk in Funiu mountain area increased by 1585.72km2,or 11.35%,while the area with high ecological risk decreased by 116.63km2,or 80.88%.In terms of space,the area of low-impact distribution area has been significantly enlarged,the area of medium-impact distribution area has been significantly reduced,and the area of high-impact distribution has been reduced,indicating that the ecological risk of the research area has been controlled,the influence of human activities has been reduced,and the self-regulation ability of the ecosystem has been enhanced. |
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