Analysis Of Landscape Pattern And Its Ecological Effect In Pingjiang County

The study of regional landscape pattern and ecological effect has always been a hotspot in landscape ecology research,which is of great significance to regional sustainable development.Based on the Landsat-TM remote sensing images of Pingjiang County in 2001,2009 and 2016,this paper uses remote sensing image interpretation software,landscape pattern evaluation model and ecological environment condition evaluation,which is based on field investigation and data collection.Methods,and geographic information system technology to carry out the preliminary analysis of the landscape pattern and ecological effect of Pingjiang County in three years.The results are as follows:(1)The analysis on Landscape type: From 2001 to 2016,the area of forestland in Pingjiang County landscape pattern occupies an absolute advantage,followed by farmland.During the study period,the landscape types also showed different trends,and the overall performance of forestland and construction land increased,while other landscape types of cultivated land,garden land,waters and unused land decreased.Among them,the growth rate of urban construction land in construction land is the most obvious,and the decrease of bare land is most obvious in unused land.(2)The analysis on landscape pattern index: The results show that the overall connectivity of the forest land,shrub land,other forest land,paddy field,dry land,flow and lake in Pingjiang County is good and the degree of aggregation is strong.With the development of social economy in Pingjiang County,the scale of urban construction land and rural residential land has been rapidly increased,and their landscape connection degree and degree of aggregation have been improved.The landscape scale of dryland,garden land,bare land and bare rock gravel has been reduced The degree and connectivity are weakened and the distribution tends to be scattered.(3)The analysis on landscape pattern at different scale: Based on the Ripley's K function,the results of the multi-scale landscape pattern and its changes in Pingjiang County show that the construction land,water area and forest land in Pingjiang County have significant aggregation distribution at all the research scales,and the aggregation intensity of forest land is obviously larger than that of water area and construction In the small scale,the spatial distribution of cultivated land and garden land shows aggregation,and when the research scale is increasing,the spatial pattern becomes random.The landscape spatial pattern of each landscape type has also changed,and the spatial distribution of cultivated land,garden and water area has been reduced,and the distribution of forest land and construction land has become more uneven and the degree of aggregation has increased.(4)Evaluation of ecological environment quality: The ecological environment status index(EI)of Pingjiang County was 63.44 in 2009 and 65.47 in 2009,which was 66.63 in 2016.The results showed that the EI grade of the three periods was "good".The change of ecological environment from 2001 to 2016 was 5.53,which indicated that the ecological environment of the study area was basically suitable for human survival and developed towards the obvious trend.(5)Evaluation of soil and water loss: During the study period,the area of soil erosion in Pingjiang County was decreased,soil erosion was mitigated,and soil erosion was mainly moderate and moderate.Soil and water loss is as follows: unused land>farmland> construction land> forest land>garden land,which can be seen,forestland and garden land is less prone to soil erosion,unused land is the main occurrence area of soil erosion.(6)Evaluation of ecological support capacity: According to the theory and method of ecosystem service value,it can be found that the ecological support value of the study area is decreasing with the value of ecological service.The results show that the landscape pattern of Pingjiang County has changed to a certain extent during the urbanization of Pingjiang County.The rapid increase of construction land has led to the decline of Pingjiang ecological support.(7)Evaluation of regional ecological risk: The spatial distribution of the overall ecological risk in the study area shows that the ecological risk is low in the southeastern,middle,southwest and northern mountain areas.In the hilly area of the Miluo River in the middle reaches of the Miluo River,the hilly areas in the upper reaches of the Miluo River and the hilly area of the Moufu Mountain granite are mainly cultivated land,farmland and unused land,and the serious ecological risk is serious.However,the ecological risk response coefficient(ERV)was negative in 2009-2016,which indicated that the landscape pattern changed to a certain extent,which led to the reduction of the ecological risk level.The implementation and maintenance of the ecological environment in Pingjiang County had achieved some effect at this stage.