|其他摘要||Land resources are the most basic material for human survival and development. True and accurate grasping of base data of land use, rational planning, using and protecting of land resources are essential to promote the comprehensive, coordinated and sustainable development of economic and social. The region of Xinjiang is one-sixth of China. With the repaid economic development, population growth and social progress over the past four decades in Xinjiang, the land use patterns also are continuing undergoing tremendous changing. There are different change characteristics of the land use in different periods over the past 40 years. A well-research survey of land resources and a well understanding of the change patterns of various stages in Xinjiang will play a constructive role in making the economic and social development plans in this area.
Based on the MSS remote sensing data among 1970s, the TM remote sensing data in the late 1980s and early 1990s, the CBERS and TM remote sensing data during 1999 to 2000 and 2004 to 2005, and the CBERS and the ETM+ remote sensing data during 2009 to 2010, this study reconstructed the land use vector databases during last 1970s to 2010. Based on the Landsat-8 OLI remote sensing data of 2015, this study update this vector database to 2015. At last, we got six land use vector databases since the late 1970s to 2015 of Xinjiang.
This study calculated the area of each land type at first classification level and other dynamic data from every phase. Using the latest data, this paper make an overall profile for the current status of land use in Xinjiang. Using the whole six stages data，this paper analysed the different trend characteristics of land use change at each stage. Focusing on the cultivated and construction land, this study made a further analysis to their different expansion patterns. Regarding of the regional differentiation of expansion of cultivated and construction land, this study area is divided into 10 relative complete and independent oasis units, and expositing the various features of expansion of cultivated and construction land. The conclusions as following:
(1) “The higher degree of land utilization, the smaller land area” is the main characteristic of land use in Xinjiang. The Land use structure of Xinjiang is as following: cultivated land accounts for 5.49%, construction land accounts for 0.5%, grassland area accounts for 29.60%, water area accounts for 2.09%, and forest area accounts for 1.69 % unused land accounts for 60.63%.
(2)The conversion area at each stage is huge. Land use in Xinjiang is under a drastic state of change. The most notable change is the change from grassland and unused land to cultivated land. “The total change area is considerable, the degree of changes is dramatic; cultivated land is expanding, grassland and unused land are shrinking” is the main characteristic of land use change in Xinjiang.
(3) The composite index of the degree of land utilization has always been a rising trend since 1970s. Based on landscape heterogeneity index, we found the degree of land type order is low, so as the degree of balance. But the order degree is increasing, and the inequality is decreasing.
(4) Both the area of cultivated and construction land in Xinjiang are have two expansion peak. As for cultivated land, they are 2000 to 2005, and 2010 to 2015. As for the construction land, they are the late 1970s to 1980s and 2010 to 2015.|