Simulation Research On Change Of Land Cover Landscape To The Influence Of Regional Temperature In The Northern Slope Of Tianshan Mountains

In the context of global warming, trend of warm and humid was evident in The northern slope of Tianshan Mountains. In recent years, land cover landscape has undergone tremendous changes, the reasons for these changes are currently under study. Land-Use and Land-Cover Change(LUCC)is one of the important drivers of climate change from a global regional perspective. In order to explore the intrinsic relationship between the two. In this paper, The northern slope of Tianshan Mountains as the research object, analyzed land cover landscape change using land use data which generated remote sensing images and topographic maps. Analyzed temporal changes and features of temperature in nearly 60 years, surface temperature data of meteorological stations as the underlying data source. WRF model was used to simulate the impact of land cover changes on regional air temperature nearly 40 years. The results show that:(1)Grassland and unused land is the major land use types of The northern slope of Tianshan Mountains, unused land is dominant. In recent years, farmland, woodland and urban and rural construction land ratio continued to increase; grassland and water reduction; glacier / permanent snow substantially reduced, and unused land decreased slightly. From 1976 to 2013, the main directions of land use conversion are: from grassland to farmland, forest land and unused land, from arable land to urban and rural construction land, from glacier / permanent snow to unused land.(2)From 1976 to 2013, the overall trend of patch shape is complexity. Landscape diversity and evenness decreased, the proportion of each type of landscape differences increase landscape heterogeneity weakened. Landscape fragmentation increases. Unused land, grassland and woodland patch shape is more complex, arable land, water and urban and rural construction land patch shape is simple. Grassland and unused land landscape fragmentation degree is high, all other types of landscape fragmentation is low.(3)From 1959 to 2013, Northern Tianshan Mountains annual temperature change is rising, warming to about 1.09℃. Geomorphology influence the magnitude of warming, the biggest is mountain, followed by Oasis. The average temperature and rate of temperature has obvious spatial differences, the average temperature presented high in the middle of the Northern Tianshan Mountains, and lower in east and west.(4)WRF model simulation results based on the same field of climate data and Landsat image classification data shows that: The types of land use and cover change may cause the warming effect include: From grassland to arable land, from glacier / permanent snow to unused land,from forest land to grassland, grassland to unused land and unused land into farmland, the cooling effect include: Unused land to grassland, grassland to forest land and unused land into farmland.(5) There is a certain spatial coherency between region of temperature change and region of land cover change. From land cover change perspective, increase of arable land and unused land and decrease of grassland and woodland maybe lead to temperatures increased, Local cooling trend may be result in largely unused land were reclaimed grassland and farmland.