Study On The Landscape Pattern Xining Of Urban Forest Based On RS Technology

Choose to Xining city as the research object, in the city’s 1987, 2001 and 2013 three times of the TM remote sensing image as data sources, using the landscape ecology principle, combined with the forest resource survey data, the remote sensing digital image processing system supported by GIS and landscape analysis software system Fragstats3.3, analyses the forest landscape dynamic changes in Xining city. Among them, the class is divided into land, shrub land, around, not forest planting area and non-forest; Landscape analysis is divided into the overall level of the landscape and the landscape elements types, selecting eight landscape index, namely the number of patches(NP), plaque AREA(CA), the proportion of landscape patch AREA(PLAND, patch density(PD), average patch density(AREA- MN), edge density(ED), Shannon diversity index(SHDI), Shannon evenness index(SHEI). Through the research to obtain the following main conclusions:(1) At the landscape level, forestland accounted for 3.7326% of the total area of 1987, 9.1779% in 2001, in 2013 was 11.9551%, having a great effect on human activities, the study area land use rich gradually, increase species diversity, the area of forest patches increased, plaques total number decreased significantly, the contrast between heterogeneous enhancement, fragmentation, strengthen urban greening, vegetation coverage rate increased. Non-forest area has also been on the rise, the urban construction in the outward expansion of state. Prove that, after a long period of artificial afforestation, increase of vegetation coverage, ecological recovery, gradually improve the forest landscape pattern, reduced the forest landscape fragmentation and improve the stability of forest ecosystem and complexity.(2) On the level of landscape elements, landscape fragmentation and landscape spatial heterogeneity degree reduced. In the landscape diversity index from 1987-2013 diversity index at first and lowered later has retained at around 1.2124, evenness index is also at first and lowered later has retained at around 0.6767, shows that all kinds of landscape composition area ratio difference in diminishing, landscape distribution of each component in more and more uniform, one or several dominant landscape components is less and less, these changes that landscape structure due to the strengthening of human activities and become balanced.(3) The landscape type transfer, forestland and non-forest area increased, as the population increase, economic growth, the city has been the outward expansion, non-forest and growing area of land for construction, is bound to cause a decline in land requisition and woodland area around, however, with the improvement of consciousness, and the corresponding to the call of the party and state, green also continue to strengthen, the land through transforming, gradually to plant shrubs, enables existing shrub land into forest land, in a large number of build plantation at the same time, also to strengthen the protection of the existing forest land, improve the greening coverage, ecological restoration, full of the organic combination of cultural, social, environmental and sustainable development.