Study On Remote Sensing Monitoring And Driving Mechanisms Of Spatiotemporal Variation Of Vegetation Coverage In "Sino-Burmese Herringbone Economic Corridor"

"The Sino-Burmese Herringbone Economic Corridor" was proposed by China and Myanmar in 2017,it relied on the strategic of "the Belt and Road" in China.The region has an important geographical position,prominent strategic position and sensitive ecological location.Its ecological and environmental problems will affect the adjustment and layout of the economic structure of the corridor.However,there are few studies on this area at home and abroad,and the existing data are too fragmentary and incomplete.Under the background of global land ecological environment change,it is particularly necessary to carry out scientific research on its vegetation cover change.Therefore,taking the vegetation cover along the corridor from 2000 to 2017 as the research object and 3S as the core technology,some research methods based on spatial positioning,object-oriented classification technology,spatial analysis,meteorology,statistics and other fields and disciplines will be linked,and the spatiotemporal pattern,evolution,fluctuation,sustainability and trend of vegetation cover change in the study area were explored from multi-level and multi-angle.In addition,the response of vegetation to natural and human activities was fiurther explored,as will as the driving mechanism of vegetation cover change in the past 18 years was deeply analyzed.Through inquiry,a universal research method system and model based on interdisciplinary research is constructed to promote the expansion of the breadth and depth of the theory and research methods in this field.Furthemore,the establishment of basic geographic data database in the study area will enrich its research contents in the field of vegetation cover,and the research conclusions can provide scientific basis for regional vegetation protection and ecological environment construction.Especially in the context of "corridor" construction,it provides an important reference for improving our ability to deal with the ecological risk and the impact of geographical security at the border.The main research conclusions are as follows:(1)In time,from 2000 to 2017,the vegetation fractional cover(VFC)in the study area showed an increasing trend in the low fluctuation process of interannual and interseasonal trends,it accompanied by a cyclical change of 14 years.The monthly change showed an "S" growth trend.In the past 18 years,the average value of VFC was 0.6899,and the total proportion of medium-high and high vegetation coverage areas was 79.06%,the vegetation coverage was good as a whole.The spatial distribution ofthe vegetation coverage was low in the central and southern regions,and higher in other regions.During the year,affected by the Water and heat changes caused by alternation of dry season,rainy season and cool season,the average vegetation coverage of each season can be arranged from large to small in autumn,winter,summer and spring.In space,The main changes of vegetation cover in the study area in the past 18 years showed persistence and improvement trend.,accounting for 96.18%.Most regions showed low fluctuation change characteristics.The future evolution of vegetation in the region is mainly in the codirectional characteristics,and the areas with benign,malignant,unchanged and uncertain directions accounted for 35.31%,8.32%,36.07%and 20.30%respectively.The development prospects of vegetation are good.At the same time,in view of the malignant development areas,much attention should be paid to and vegetation protection policies should be formulated according to local conditions.(2)Object-oriented Cart decision tree had higher classification accuracy and it enough to meet the needs of this study.The classification results show that all kinds of land classes in the region had undergone increasing or decreasing transformation in the process of low fluctuation in the past 18 years.The increase of forest and grassland and the decrease of large area of bare land make the vegetation cover in the study area increase as a whole,and the land transfer matrix consistent with the conclusion of the study on the evolution characteristics of vegetation cover at macro scale.(3)There were correlations between VFC and elevation,slope,temperature,precipitation,population density,intensity of Human activity intensity of land surface and radiation distance of cities and towns in the same period.Among them,elevation,slope,population density and other factors have bidirectional correlation with vegetation cover distribution.VFC showed Hysteresis and spatial difference with temperature and precipitation in time and spatial distribution.While HAILS,urban radiative distance and VFC distribution showed significant negative correlation and significant positive correlation,respectively.(4)Research on comprehensive driving mechanism showed:In terms of temporal scale,precipitation factors had the greatest impact on the dynamic change of vegetation cover in the past 18 years,followed by temperature,which totaled 76.73%,and the contribution rate of human activity factors accounted for 23.27%.Affected by low population density,relatively backward of economic development and strict forestry protection policies,human activities in the region had little impact on vegetation cover in the past 18 years.On the spatial scale,the contribution rates of each index affected the spatial distribution of VFC from big to small were elevation,slope direction,slope,temperature,population density,HAILS and precipitation in turn.Among them,the contribution rates of topographic factor reached 61.78%,which was the main controlling factor affected the spatial distribution of vegetation.The contribution rates of temperature and precipitation were 14.70%,4.64%,19.34%,respectively.Compared with time-scale driving effec,the driving force of precipitation on VFC was greatly weakened due to the abundant water resources reserve and strong regulation ability in the study area.Among human activities,the contribution rate of population density and intensity of HAILS totaled 18.88%,the increase of population,the intensification of economic development and urbanization and other human activities would inhibit the development of regional vegetation.