Assessment On Wetland Ecosystem Based On 3S Image

Wetland ecological health evaluation of wetland ecosystem is in one kind of comprehensive evaluation of state. Through the wetland ecosystem health assessment, can understand wetland ecological system structure and function condition, wetland ecological system pressure and wetland ecological system produces reaction, so as to formulate wetland ecosystem protection and recovery measures provide the scientific basis. Qilian mountains was known as the "natural reservoir hexi corridor of the source area in heihe," special geographic position, and laid it in heihe water conservation and become the special position of the ecosystem function area. At the same time, it as the qinghai-tibet plateau region typical wetland ecological landscape area, is Tibet plateau wetland landscape, so the epitome of heihe analysis and research of wetland status and qilian mountain headwater area of dynamical regularity, wetland ecosystem health evaluation, this to research the whole the heihe river basin has the great significance.In this paper, using the 3S in 1999, 2006 and 2009 TM remote sensing data, establish interpreting marks, match with field investigation, extracting all periods of land use land cover and landscape information, from plaques type level index and landscape type level index in two aspects of the qilian mountain headwater area of qinghai heihe wetland landscape space-time structure analysis. On this basis, according to the ecosystem health of evaluation principle, the selection of the PSR model and combining with statistics and mathematical models were used to obtain the wetland ecosystem health assessment needs many kinds of index factor, the relative comprehensive evaluation method, heihe source area of qilian mountains 1999-2009 wetland ecosystem health evaluation, the conclusion that the following results:(1) From 1999 to research in 2009 the number (NP) patch from 591 a increased to 710 a, 10 years the qilian mountain heihe source area wetland landscape fragmentation degree in increase; 1999 and 2009 is respectively: landscape shape index 13,804 3.28%, landscape shape index and become larger, explain landscape plaques of irregular shape, are susceptible to human activities, natural condition the influence; From 1999 until 2009 the whole landscape average patch fractal dimension value 1.21% reduced to species from this area studied landscape, said the shape of patch tend to rules; Fixed diversity index increased from 0.73% of 1999 2009 0.9%, reflect the research in the whole landscape fragmentation degree is on the increase.(2) From 1999 to 2006 (CEI) 0.6; From 2006 to 2009 (CEI) for surprisingly. From 1999 to 2006 heihe source qilian mountain wetland ecosystem health classification forⅡlevel (0.6 ~ 0.8), reasonable structure, pattern of ecological system is complete, the vigor of the system is stronger, the outside is lesser, no ecological abnormality, ecosystem function is more perfect, the system is still stable, sustainable; 2006-2009 heihe source qilian mountain wetland ecosystem health classification forⅢlevel (0.4~0.6), the ecological structure is more reasonable, system is still stable, larger, close to ecological outside pressure sensitive aperture value, but more, there has been a small amount of ecological anomalies appear, can give full play to the basic ecological function, ecological system can maintain should quickly.Finally, according to the 1999 to 2006, 2006 to 2009 wetland ecosystem evaluation result, headwater area of qilian mountains Suggestions heihe wetland protection.