Land Use/Cover Change And Study On Its Landscape Ecological Effects In The Yellow River Delta

Land use/cover change is an important cause that global environment changes, It has become thefocus in the field of environmental research from home and abroad .Because the forming time ofthe Yellow River Delta is relatively late in the intermediate zones of many kinds of ecosystems, landuse/cover change is violently .The Yellow River Delta has become one of the heated areas for Landuse/cover change. This text regards the remote sensing (RS ) and geographical information system (GIS )as the main technological means,, study the Yellow River Delta land use / cover type development trends andlandscape ecological effects, and expect to offer scientific basis to this area development utilization andprotection. The result shows :1.on 1986~1996, Yellow River Delta various kinds of land cover Tamarisk chinensis-Phragmitescommunis produce and change over to the strongest type, produce it for shrimp's crab's field , farmland andreed field mainly; The Tamarisk chinensis-Phragmites communis changed mainly came from cultivated landand suaeda heteroptera-Aeluropus littoralis Var.Sinensis. Because of the reason of blanking for the YellowRiver, the proportion of area of raw vegetation of salt of eastern nature reserve of the Yellow River mouth ison the rise, and the northern nature reserve is far away from the mouth that present the downward trend;Various kinds of land are covered and remained biggest by the area that the Chinese tamarisk reed produce inthe type, mainly produce it for the cultivated land , shrimp's crab's field and reed grassy marshland in1996~2001; Shrimp crab field change over to largest, the whole area leap to third in 2001 from eighth in1996, developed by the suaeda heteroptera-Aeluropus littoralis Var.Sinensis and Tamarisk chinensis-reedmainly. Salt vegetation reduce speed is 1.98% every year in eastern nature reserve., and it was higher than theYellow River delta and lower than the northern nature reserve, that was different from in1986~1996.2. During 1986~2001 year, comprehensive trends, LUCC Rt is 1.48% in Yellow River Delta, but greaterthan in earlier stage (1986~1996 ) on later stage . At space, shrimp crab field space dynamic change degree isthe most heavy,and it is 132. 47%, the cultivated land trends degree is minimum,and it is 2. 01%; Northernnature reserve comprehensive trends,degrees is 5.41%, the Phragmites communis space dynamic changedegree is the greatest, that is 134.37%, the Ra suaeda heteroptera-Aeluropus littoralis Var.Sinensis is5.46%;Rt of Easternf nature reserve is 2.86%, shrimp crab field space dynamic change degree is the mostheavy among them, that is 3329.6%, the residential area is minimum 2.73%.3. The changing amount that the land utilized degree of Yellow River Delta every year is 1.89% in1986~2001. Re> 0,that proves the land use is developing in this area, and the land type changes violently .Butthe changing amount in earlier stage is smaller than later stage every year , the speed that the land utilizesdegree to improve has trend of increase; The northern nature reserve Ra is 0.28% in 1986~2001,and the landuse is developing. But in previous Ra is 2.15%, and it is developing,in later stage is3.46%,that is inadjustment period; During 1986~2001, the Ra is 0.28% in the eastern nature reserve, and it is lower in earlierstage than on later stage , the speed improved has trend of increase.4. The land use/cover change is not only affect by natural factor but also affected by social economy andpolicy factor. The hydrology state of the Yellow River is the most important natural drive factor. Withpopulation's increase and quickening of the urbanization process, the social economic factor has alreadybecome this district dominating the factor of land use/cover change.5. On 1986~2001,Yellow River Delta level, the cultivated land is the largest type in the view , it is a hostof the Yellow River Delta view . Piece broken to take, spot an average area reduce with Yellow River Delta...