Dynamic Change Of Woodland Landscape Pattern And The Optimization Strategy In Tianmu Lake Watershed

Due to the impact of the city's rapid development,the trend of regional ecological environment deterioration has not been fundamentally curbed,and the ecological space of the watershed space represented by woodland is typical of serious damage and degradation.Liyang Tianmu Lake watershed is located in the western part of Tianmu Mountain,and the woodland resources are abundant and the species diversity is high.However,with the development of the urbanization of the watershed,the woodland and other land use structure disorders lead to the deterioration of the ecological environment within the watershed has became an important factor restricting the sustainable development of ecological watershed.Therefore,taking the woodland of Tianmu Lake watershed as the research object,the study selects the three year remote sensing images of 1995,2005 and 2015 to analyze the dynamic changes of woodland landscape pattern in the past 20 years from the perspective of landscape ecology,and analyzes the driving factors of its dynamic change from the perspective of quantitative and qualitative.At the same time,the study establishes the CA-Markov model to forecast the future woodland development trend,on this basis,combined with the theory of landscape ecology,puts forward the optimal protection strategy for the future trend.The main conclusions are as follows:(1)During the study period,the woodland area of Tianmu Lake watershed is the largest in land use type,but with the social and economic development of the watershed,the proportion of total area of woodland continued to decline,the woodland type structure changed,and other woodland land gradually became the main body of woodland structure;The formation of woodland type plaque is serious,the patch shape tends to be simple,The heterogeneity of landscape level of woodland being enhanced,and the landscape level of woodland showing a more obvious convergence of the development trend.The unreasonable development of woodland landscape pattern,which is driven by human factors,reduces the ability of its landscape to resist and resist natural disasters.It will adversely affect the habitat,reproduction,migration and energy flow of Tianmu Lake watershed,and brings hidden dangers to the ecological sustainability of the watershed.(2)Based on the establishment of CA-Markov model,it is found that,the trend of future woodland structure change in Tianmu Lake watershed has not been changed,there is a continuous reduction in woodland area,other woodland land and other types of woodland land conversion frequency is higher,it reflects the development direction of the woodland structure of Tianmu Lake watershed in the context of urbanization.According to the research results,combined with the principles of landscape ecology,the study optimizes the woodland of the Tianmu Lake watershed by integration of woodland patches to reduce the degree of fragmentation?balanced of woodland structure to improve patch connectivity?restoration of ecological habitat to improve species diversity?strengthen ecological control to establish a sound monitoring mechanism and other aspects,to realize the guiding function and reference significance of ecological protection of watershed woodland.