| Since the 21 st century,the city of Lanzhou has undergone significant changes over the past 20 years as the capital of the state of Gansu.Due to various factors,such as geographical position and precipitation,the city of Lanzhou is located west of the Loess Plateau to the west of Yunnan.The overall ecological environment is relatively fragile.The Land Use Survey(LUCC)was conducted in different regions since the beginning of the last century.In order to analyze land use changes in Lanzhou City in1995,2005 and 2016 with the data of the third stage in Lanzhou City,the land use model and the resistance index for gardening were used with the support of ARCGIS.technology.Over the past 20 years,changes in land use and landscape landscapes in Lanzhou City have been analyzed in order to analyze the drivers of the relevant impact changes.The results of the study are as follows:In this paper,in 1995,2005 and 2015 in Lanzhou three land use data,with the support of gis technology under the model number of each land use and landscape stability index of Lanzhou city nearly 20 years of land use and landscape pattern change analyzed results are as follows:(1)Lanzhou City 1995--between 2005 and convert various types of land between infrequent,with an average annual rate of change in the period of six types of land at less than 0.5%,the rate of change of land are integrated districts about 0.2082 percent,overall land use change is relatively flat,little land use intensity;2005-between 2015,urban land use greater change relative to the previous period occurred,farmland and construction sites are the most growth fast two types of land,with an average annual dynamic change index reached 2.45% and 1.53%,which Anning District,Chengguan District,Seven Mile River District,and is most evident in this period of three areas of land use change,land dynamic index They were 2.078%,1.777% and 4.103%,which is also from the use of a rapid increase in intensity index reflects 2005--Lanzhou urban land use intensity and overall faster growth rate between 2015 a period of time.(2)In the past 20 years,the Lanzhou urban landscape pattern there are various types of landscape in different periods in the memory of uneven development,the arable land and construction land mainly for increasing the landscape area,the edge index and fragmentation index decrease and increase connectivity features,stability index from the landscape point of view,construction land and farmland as two types of land and is closely related to human life,landscape stability index is gradually increasing,stable construction land index is sorted by the first of three in 1995 and2005 and four in 2015 rose for the first one;grassland,woodland,water and unused land fragmentation reduce overall presentation,distribution pattern centralized space but the landscape stability index decreases described with respect to construction land and arable land,grassland,woodland,water and unused land is more readily converted to other land use types. |
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