Response Study Of Regional Land-use Changes On The Eco-environmental Effects Based On RS And GIS Technology

Nowadays，landuse/cover change and its ecological effects is the hot topic ofglobal change research. Land-use change and its impact on the ecological environmenthave important significance for understanding the regional ecological environment aswell as global environmental change. Land-use and ecosystem services are closelyrelated to research land-use change driven by the value of ecosystem services, animportant quantitative indicators of the effects of the changing environment as the landuse.Ecosystem service value by computing the specific study area, quantitative analysisof the response to the evolution of eco-environmental quality of land-use and usefulsuggestions, and then on the sustainable use of land resources.Guangyang Island is a large river island in the Yangtze River basin, excellentnatural environment on the island. With economic development, the living environmenthave become increasingly demanding, Guangyang island its special geographicalposition, good ecological environment, more attention has been paid.At presentChongqing take “the Yangtze valley ecology shore island model district” as a goal,carries on the ecology island construction, its land utilization way and the land covertype is having the fierce change. Guangyang island land use/cover and landscapepattern change and its ecological environment effects, has important theoreticalsignificance and practical value for the Guangyang island ’s economic construction andsustainable development.The papers with1988,2001,2009year of Landsat/TM satellite imagery, remotesensing classification of land use is supported by ERDAS, the ARCGIS softwareGuangyang island landuse/cover the dynamic evolution of landscape patternanalysis.On this basis, we explored the mechanism of the driving force caused by theland use and landscape pattern change.Finally, the use of ecosystem services valuationtheory and sensitivity analysis methods Guangyang island1988-2009,21years of landuse/cover changes in the eco-environmental effects were studied.Conclusions as follows:(1) During1988-2009year, landuse change of Guangyang island indicatessignificantly.From1988to2001, the construction land, forest land, barren land of thereservoir pond has increased,(Accounted for the total acreage separately from19881.55%,0.66%,4.10%and0.30%increases to20012.84%,3.76%,25.32%and17.21%;But the scrub forest and Yangtze River account for the total acreage the proportion,from198848.65%and28.04%reduced to200141.86%and6.27%).2001-2009,paddy fields and shrubbery is substantially reduced, were reduced by100.62hm~2and116.28hm~2.The forest land by58.76%dynamic degree swift and violent growths, in2009the area has achieved204.21hm~2. The construction land continues maintains thegrowth the situation, its dynamic degree also achieves12.11%.(2)Through the land use model to calculate the years1988-2009GuangyangIsland land use degree index. The results showed that: Guangyang Island in1988,2001and2009, the composite index of the degree of land use were2.16,1.98and2.06,were lower than the national2.32average; index change marginally more stable.(3)Guangyang Island three periods of land use type space evolution obtained：From1988to2009,21years, a large number of Guangyang island paddy fields andshrubbery into the forest and construction land. Evolution along traffic roadscommence, and gradually extends to both sides.（4）According to the principle of landscape ecology, combined with GuangyangIsland land-use characteristics, selected nine representative landscape indicators andindices, quantitative analysis Guangyang Island landscape pattern change. From theLandscape level: Guangyang island Landscape Pattern in1988-2001showed highheterogeneity, strong fragmentation and land use of the diversity of landscape patterncharacteristics. Heterogeneity between2001-2009lower increase in aggregation,landscape pattern toward a few advantages of pieces dominated. From the typehierarchy: the shrubbery a significant reduction in the establishment of protected areasbecome more rules, more tended to focus on; Woodland in the2001-2009plantingcitrus and nursery area increased due to interest-driven, gradually linking the originalseparation of small pieces, making the woodland into the film growth, fragmentationfirst increase and then decrease, from44.44in1988increased to284.785in2001, thendecreased to169.414. Increasing the construction area, toward the direction ofcontinuous fragmentation, but due to the impact of human activities is the most dramatic, Therefore, the minimum value of the fractal dimension of the constructionland, the most self-similarity of the pieces, pieces the shape of the relative rules.(5)Use of ecosystem services valuation, Guangyang Island a variety of land usetypes of ecosystem service value and the total ecosystem services value were calculated.The results showed that Guangyang Island, the total value of ecosystem services in1988,19,305,400yuan,19,527,700yuan in2001,19.2935million yuan in2009,showing a reduction in the volatility trend first decreased and increased, but littlechange in the relative stability. Paddy fields and shrubs decline, were reduced by58.59million and3.5014million yuan; Woodland (woodland and shrubbery) Guangyangisland ecosystem services value of the contribution rate of43.07-48.82%. Changes inthe area changes the value of ecosystem services change Guangyang island plays adecisive role.