Study On The Landscape Pattern Changes And Its Ecological Effects In Dali City

The landscape pattern and its ecological effects change with the rapid development of urbanization,and the contradiction between the ecology vulnerability and the construction urgency in plateau mountain region is particularly serious,so,it's very important to find a sustainable development of urbanization.Based on the Landscape Ecology theories,This study uses three remote sensing images of Dali city in the year of 1995,2005 and 2015 to do research on the landscape pattern changes and its ecological effects in Dali city according to a typical "Pattern-Process-Effects" landscape ecology research method.The research on the landscape pattern changes in Dali city is mainly done by analyzing the landscape distributions,the landscape changes indexes,landscape transfer matrix and the landscape pattern indexes,and trying to divide the Dali city into three ring regions to compare its differences in the process of landscape pattern changes.The research on the ecological effects of the landscape pattern changes in Dali city is mainly done by analyzing the impacts on the ecological environment qualitatively and analyzing the ERI(Ecological Risk Index)quantitatively.And according to the results of the two research mentioned above,some suggestions on the ecological optimization of landscape pattern in Dali city are put forward in the end of this study.The main conclusions of this study are as follows:(1)The construction landscape and the forest landscape have a increasing trend,while the bare landscape,the agricultural landscape and water landscape have a decreasing trend in Dali city.In the years between 1995 and 2015,the diversity of the landscape patch was decreasing,the connectivity of the landscape was increasing slightly,the degree of landscape aggregation was maintained at a high level,and the shape of landscape patch has become more and more regular.(2)The stability of the landscape pattern in Dali city has a positive correlation with the distance from Erhai to the region,the closer to Erhai the region is,the greater the landscape pattern changes.(3)The ecological risk of the landscape pattern changes in Dali city has been reduced for the years between 1995 and 2005,but it was increasing substantially in the years between 2005 and 2015.The distribution of all kinds of ecological risk region shows spatial agglomeration characteristic,and the ecological risk level is obviously different between Haidong region and Haixi region,the ecological risk in Haixi region is much lower than that in Haidong region.And the trend of the ecological risk of the landscape pattern changes in Dali city can be described as partly meliorated while entirely deteriorated.