Dynamics of land use/cover changes in the Weigan and Kuqa rivers delta oasis based on Remote Sensing

Land use/1and cover change(LUCC)is one of the core issues in global change research.This study takes the typical oasis of Weigan and Kuqa rivers,which are located in the north of the Tarim Basin,using 4 temporal images combined with field survey.With the application of Remote Sensing and Geographic Information Systems,classified statistic and LUCC transform matrix were acquired.The conclusions are as follows:(1)In the period from 1989 to 2001,the areas of farmland,woodland,moderate saline land,water and the other(Gobi,sand and clay,etc.) have increased;slight saline land and heavy saline land has reduced.In the period from 2001 to 2006,the areas of slight saline land,moderate saline land and heavy saline land have increased;the other types of land use/covers have reduced.In the period from 2006 to 2010,the areas of moderate saline land,heavy saline land,water and the other have increased;the other types of land use/covers have reduced.(2)As time went by,the gravity center of every type of land use/covers has changed.The farthest distance is the change of gravity center of water between 1989 and 2001,which is 23.12km.At the same period,The distance of the gravity center of heavy saline land moved to the northwest is smaller than that of water,which is 22.04km.The gravity center of woodland moved to the southwest,and the transferred distances increased year by year.The gravity center of moderately and slightly saline land in essence transferred to northwest during these 21 years.(3)From 1989 to 2010,the Shannon diversity index and the Shannon evenness index are both steadily increasing,which indicates that heterogeneity is on the rise.The Aggregation Index is insignificant,with concentrations between 78 and 85,indicating that the connection is in a higher degree of the same patch types.In the period from 1989 to 2006,fractal dimension indexes have increased,with the increase of human interference degrees;land use landscape pattern has become more complex in the study area.From 2006 to 2010,fractal dimension indexes have decreased,While landscape has shown slight improvement.In short,various types of land use changes have significantly affected the study area over the past 21 years.In all,not only the transition of one type of land into another was frequent,but also the landscape pattern was subjected to many changes.This study identified the land use/cover changes of time and space,analysis the driving factors,In addition,this study makes suggestions for improvement.The results of the Western Oasis′s environmental changes and sustainable development research have practical significance and is also an important complement to global change research.