| Analysis of landscape pattern changes and its driving factors are important parts of landscape ecology.Landscape index is commonly used in the study of landscape pattern change,but it has obvious scale dependence.Therefore,it is of great significance to study the grain size effect of landscape indices,select the appropriate grain size range for calculating landscape indices,screen out representative landscape indices,and explore the driving factors of landscape pattern changes at different spatial and temporal scales.It is significant for analyzing the law of landscape pattern change and predict the future trend of landscape pattern change.This paper took two different scales of Anhui province and Huainan,a typical coal resource-based city,as examples,and Landsat TM remote sensing images in 2000,2005 and 2010 as data sources.Based on the remote sensing interpretation results,it took the method of land use transfer matrix to intuitively analyze the quantity and direction change of land cover in Anhui province.In order to study the grain size effect of landscape indices and determine the suitable grain extent,the grain size effect curves of landscape indices were depicted by setting different grid sizes.It used the correlation analysis,factor analysis and sensitivity analysis to select the representative minimum landscape indices set.It took the methods of qualitative description and quantitative analysis to analyze the driving factors of landscape pattern change.Based on the above methods,obtained the differences of landscape pattern change characteristics and driving factors in different spatial and temporal scales and different development modes.Through the above research,obtained the following results and conclusions.Based on land use transfer matrix and land cover index,the change of land cover in different regions was determined.The order of dominant landscape was different between Anhui province and Huainan city.The land cover in Anhui province was mainly cultivated land,woodland and artificial surface,while that in Huainan city was mainly cultivated land,artificial surface and wetland.During the whole study period,the land cover types of Anhui province and Huainan city with large area change were cultivated land,artificial surface and wetland.According to the order of area transformation,the orderes were: cultivated land into artificial surface,cultivated land into wetland,wetland into cultivated land.The artificial surface in Anhui province and Huainan city increased significantly,and mainly in residential areas,mainly related to the construction of urbanization at that time.The increase of artificial surface was based on the occupation of cultivated land area.The index of land cover status in Huainan city was obviously lower than that in Anhui province,that is,the level of ecosystem service function and regulation function and the livability degree of the city in Anhui province were obviously better than that in Huainan city.The suitable grain size ranges of landscape pattern change in Anhui province and Huainan city were from 100 to 125 m and from 30 to 40 m.The representative landscape index sets of Anhui province were maximum patch index,landscape shape index,average patch area and Shannon diversity index,while the representative landscape index sets of Huainan city were landscape segmentation index,Shannon diversity index and landscape shape index.The changes of landscape level in Anhui province were as follows.The dominant position of dominant types was declining constantly,the shape of each landscape element was developing towards irregularity and complexity,the landscape type was developing towards equalization and the degree of landscape fragmentation was increasing to a certain extent and then weakening.The changes of landscape level in Anhui province were as follows.The degree of landscape fragmentation was decreasing,the landscape type tended to uniform distribution and the shape of landscape elements tended to be regular and simple.The change of natural factors such as annual average temperature and annual precipitation would cause the change of landscape pattern to a certain extent,but the influence was limited compared with human factors.Quantitative analysis showed that the change of landscape pattern in Anhui province was mainly related to agricultural development,but the change of landscape pattern in Huainan city was mainly related to the secondary industry.Figure [12] table [24] reference [82]... |
