Forest Ecosystem Health Evaluation For Shawan Forest Farm In Middle Part Of Tianshan Mountains In Xinjiang Based On3S Technology

The healthy development of the forest ecological system is closely related to thestability and sustainable development of oasis in Xinjiang. Giving the unreasonablestructure, functional disorder, poor stability, plantation anti-interference ability offorest in the central part of Tianshan Mountains, the indexes measuring the health offorest ecosystem are extracted from numbers of remote sensing data and are analyzedfrom healthy ingredients including the ecosystem service function, the landscapepattern,terrain factor and physicoecology in the Shawan forest station in the middleof Tianshan Mountains as the research area. In the research, the paper uses3Stechnology, the available remote sensing data, and theoretical basis of forest ecology,landscape ecology, remote sensing and terrestrial ecosystem ecology. Then onfoundation of dimension reduction and comprehensive evaluation, the paper providesthe comprehensive evaluation indicators system of forest ecosystem health andprocess of evaluation method. The main conclusions are:(1)NDVI, LAI and NPP are three important indexes in reflecting physiologicalhealth of forest ecological system, and these indexes can indicate forest healthy fromthe coverage, crown density and photosynthetic efficiency, productivity and etcrespectively.(2)Forest landscape pattern can characterize the whole forest and part ofstructure and function, including stability, fragmentation, connectivity, marginal,aggregation, and so on, and can reflect health indexes of the forest ecosystem fromdifferent sides.(3)Forest environmental factors include elevation, slope and aspect that areimportant environmental factors effecting forest health, decide the spatial distributionand growth of forest, and play an important role in the healthy development of forestecological system. (4)The forest ecosystem service function value is an important index of theecosystem health, and can participate the assessment of forest ecosystem health in thestudy area as a main factor in the assessment of forest ecosystem health.(5)In the paper, the indictors extracted may be integrated into five aspects, thatare, edge, spread and spreading measure; productivity and canopy density factor;shape density measurement; elevation and slope; and aspect. These five factors can beused to empower the weighting value by entropy method objectively, and then foresthealth comprehensive indexes can be get by the comprehensive evaluation method.(6)The comprehensive evaluation indicators system of forest ecosystemhealth and of evaluation process are formed based on3S technology initially. Theforest healthy indicated by index system can be characterized by four aspects thatare ecosystem service function, landscape ecological structure and function, terrainfactor, physiological and ecological status respectively.Through the comprehensive evaluation of forest ecosystem health in the researcharea, the index system and evaluation process are set up, and aim to establish a rapid,simple, and feasible method and idea to demonstration of preliminary health for forestecological system, and provide theory and method for forest health maintenance andsustainable management in the middle Tianshan Mountains of Xinjiang.