Dynamic Changes Of Landscape Pattern And Hemeroby In Ximen Island Wetland

As time goes landscape pattern constantly change, it is the result of natural evolution and human disturbance. It changes affect biological individual and ecological processes. Landscape pattern is the focus of landscape ecology. By studying the landscape pattern evolution mechanism and regularity, to more clearly grasp the relationship between the degree of landscape change and human disturbance. Currently, hemeroby which in coastal wetland landscape quantitative evaluation of small applications, so dynamic changes study of Ximen Island wetland landscape pattern and hemeroby, it has important significance for optimization of the island landscape pattern and ecological rational planning and monitoring and evaluation of island resources.This paper, based on Ximen Island wetland as the study area, combined with RS and GIS technology, used of pattern index and spatial analysis to study dynamic change of the wetland landscape pattern and hemeroby index. Refer to "national land use classification"(Trial), sea use classification system, and combined with its wetland land cover and land use status, the paper established Hemeroby type classification system of Ximen Island Wetland. It used landscape pattern index and GIS spatial analysis method to get the landscape transition matrix and hemeroby index (HI). We discussed the Wetland landscape pattern and the degree of hemeroby in Ximen Island.The results indicated that:(1) Ximen Island landscape area change volatility, mudflats cultivation and mudflat area have greater rate of change. Mudflats cultivation in2000～2007,2007～2010,2011～2013dynamic rate of change were18.94%,-9.32%and-9.53%, far greater than0.12%which the dynamics change rate of2000to2013average. Mudflat in2000～2007,2007～2010,2011～2013 dynamic rate of change were-12.03%,144.37%,6.78%, while the average rate of8.6%in the2000-2013.During2000to2010, dramatic changes in the landscape area, while between2010to2013, smaller changes in the landscape. Enclosed sea cultivation and Woodland have small transition probability in2000～2013. Three periods were retained the original area of85.24%and83.57%,90.93%and91.21%,96.67%and96.29%.Mudflats cultivation and mudflat area have larger change, were retained the original area of4.29%and49.18%,62.58%and58.16%,63.76%and57.3%.On the level of plaque types:the PD and NP value were on the rise of Ximen Island in2000～2007, Plaque heterogeneity and Mosaic degrees have increased, while its NP and PD value were gradually reduced in2007～2013. Explain the Plaque porosity decreased and its distribution tends to be concentrated, to increased connectivity plaque natural state. LSI was on the rise, which indicated that patch shape complexity was gradually increased in2000-2013.In the landscape level, from2000to2007, the study area is close to the complexity of landscape shape, and it is relatively simple. Landscape fragmentation was grow, landscape heterogeneity and aggregation increased, so that few dominant landscape area increased, indicating its ability to dominate the landscape is enhanced. FRAC has increased, landscape heterogeneity lesser extent, and the advantages landscape have development of fragmentation, lead to lower its dominance in2007～2013.The area of undisturbed disturbed landscape was significantly increased, partially disturbed area sharply reduced, and the area of completely landscape changed little. In the space gradually increased from the sea to land of HI and in ages of average total HI. There has low degree of total HI but interfere with the not smooth phenomenon Patterns in the land and seaThe number of patches and patch density Index of undisturbed, partially disturbed and completely disturbed landscape were falling in Ximen Island wetland. FN of Undisturbed and partially disturbed were decreased, while completely disturbed was increased. FRAC of Undisturbed and partially disturbed were on the rise, completely disturbed was increased decline.