| As a kind of important and unique ecosystem, wetland is one of most important human living environments in the transition zone of the terrestrial ecosystem and aquatic ecosystem. The discussion of wetland's spatial and time change has a significant meaning together with the driving force to protect the wetland resources, to maintain wetland ecological equilibrium, to improve ecological environment, and to promote the sustainable development. It is very difficult to approach and measure wetland ecosystem through ground and most types of wetland can hardly field trip, moreover, the dynamic changes of wetland is stronger, the existed traditional wetland research methods cannot satisfy requirements. Now with features of multiple sensors, high marks rate, multiple time phase, and acquisition of ground information featured with bestrow scope, updating quickly, all-weather, rich in content, remote sensing technology makes itself as the ideal method to investigate wetland resources and monitor the dynamic changes of wetland.As one of main rivers in Liaoning province, Taizi River is closely linked with human's production and living in more than 4,000 square Kilometer watershed range. With the climate change and human activities disturbance, Taizi river watershed ecological environment becomes more fragile, and brings heavy losses to people's production and life. By making uses of three phases TM images covering study area range in year 1992, 2004, 2010, combining with related profile and field investigation data, adapting the landscape type transfer matrix, dynamic variation, landscape index analysis and some other methods, This article chooses middle-lower typical wetland landscape portions of Taizi river as study area, and processes quantitative evaluation analysis towards the dynamic change of wetland landscape in the study area. Find out that from 1992 to 2004, the conversion trends between natural wetland, artificial wetland and other land is opposite to that from 2004 to 2010. Generally speaking, the transformation trend from other land to artificial wetland and natural wetland is evident. Natural wetland transforming-in and artificial wetland transforming-out mainly occurred in Shenwo reservoir, Taizi river urban section, and middle-lower part of Lan river. Natural wetland centroid wholly migrated to southwest, while artificial wetland centroid migrated to northwest and southeast. The wetland landscape plaques tend to fragmentation, dispersing, variety and evenly distributed, shaped simplicity, but the degree of concentration and connectivity for the plaques are improved. Big plaques area of natural wetland is increased, and the reunion degree for plaques are increased, and connectivity is better, the shapes and boundaries are more and more regulated. Big plaques area of artificial wetland is decreased, and plaques are scatteredly distributed, and the shapes tend to be simple.By contrast of the temperature and the rainfall of the study area yearly, and through the terrain factors and wetland transformation information maps superimposed analysis in the study area, find out the natural force of the study area. Besides, it is estimated that the northern slope area with slope less than (including) 2o and height from 65 to 100 meter in the study area is the severe change area of wetland landscape in the study area, which should be protected stressedly. Agricultural reclamation behavior on both sides of the river should be forbidden especially. |
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