Study On Wetland Landscape Pattern Based On GIS And RS

Select the "YLN" in Tibet and the surrounding area as a typical alpine wetland research area.Based on multi-source and multi-period remote sensing images,the wetland information in the study area and the corresponding spatial pattern index were extracted.The spatial and temporal dynamic characteristics of wetland landscape pattern were studied by using various spatial analysis methods and mathematical statistics methods.Based on the analysis of landscape pattern and the natural and human conditions,the driving factors affecting the change of wetland were derived.Through research,the main achievements and conclusions of this paper are as follows:(1)such as band selection,false color composite,image enhancement,geometric correction and registration,image cutting,and so on,were carried out for three remote sensing images in 1996,2004 and 2013.Using human-computer interaction to carry out remote sensing interpretation and classification of post-processing.The classification results included five kinds of cover types including river,shrub,high coverage meadow,low coverage meadow and non-wetland..The classification results are plotted into the study area wetland thematic information map.(2)the introduction of wetland landscape pattern evaluation index system.Based on wetland thematic information map,the wetland area and landscape pattern index were analyzed and compared.The results show that the wetland area of the study area is reduced from 982.23km2 in 1996 to 966.36km2 in 2004 and 966.31km2 in 2013,and the decreasing rate is increasing.In the landscape pattern index,with the passage of time,the overall landscape fragmentation is relatively serious,patch connection degree is low,the landscape heterogeneity prominent.From different spatial granularity,selection of a smaller particle size is more suitable for Zhanang County wetland landscape pattern.Through quantitative analysis of landscape pattern index,it is found that the indexes fluctuated in 2004 shows that the wetland protection in Tibet has been effective in recent years,but the overall landscape fragmentation and landscape heterogeneity have not been alleviated.The non wetland,whether the area or the aggregation degree increases,also explains from the side,this research area wetland present situation is not stable enough,needs to further strengthen the protection wetland dynamics.(3)Analyze the impacts of climate change,human activities and wetland conservation policies on wetlands in the context of global climate change,Through quantitative and qualitative analysis of the two aspects,using the gray relational grade thinking,combining MATLAB and SPSS software to analyze the different driving factors,the study shows that the order of the influence factors of the change of the wetland area is the precipitation> the average temperature> the relative humidity> the tourism income> the legal policy> the GDP> the population,It can be seen that natural factors dominate the position.Then,the multiple linear regression model of driving factor and wetland area was constructed,and the decision-making basis for wetland protection was put forward.