| The formation of landscape pattern of land use comes from the common actionof various natural factors and artificial factors in an area,it includes the type,number,space distribution and space disposition about landscape units. Comparing thecharacteristics of different landscape patches and their changes and so on, the analysisof landscape pattern is a research on the features of the composition and structure oflandscape, which provides the basis for the rational management of landscape.Chaotian county is just at the new period of economic society developing fast, thecontinuous development of economy makes the area increasingly complicated of landuse types and landscape pattern of land use changing.Therefor,carrying out theresearch on landscape pattern of land use,knowing its genetic mechanism,andunderstanding the interaction between human society and the natural environment,sothat can offer better data basis for optimizing the usage structure and layout of urbanand country areas, orchestrating land exploitation, coordinating between land use andecologic environment Building,and so on.This paper made Chaotian county of Guangyuan city as the study area, using RSand GIS technique to receive land use current map and vector data of land useforms,and reclassifying land types according to research purpose,at the same time, byapplying quantitative analysis method and doing correlation analysis to analyselandscape pattern of land use of Chaotian county systematically.Looked from the whole landscape:(1) the total area of Chaotian county land was 161799.84ha, woodland’s area was96289.56ha, accounts for the land total areareaches as high as59.5115%,it was the main type of this land,and the cultivated areawas46382.04hectares, accounted for the landscape total area28.6663%,it was thesecond main type.(2)the composition structure of woodland resource was uneven,themain woodland area occupied the woodland area with95.4788%, but the shrub land,the young afforested land and the stocked land, only occupied the woodland area with2.28%,0.9%and0.82%;(3) one type patches in landscape connected highly,theCOHESION index of landscape-level reaches as high as99.1992%,and theCOHESION index of main woodland and cultivated was the highest, respectively was99.7511%and95.0471%,they were centralized;(4) the accumulation of variouspatches in landscape although was high, but the distributed and adjacent of neighborwas ordinary, the IJI index was53.4957%;(5)this landscape had completestructure,high connectivity, the CONTAG index was52.8664%;(6) there was manypatches type in the landscape,and the land use type was plenty, the SHDI index was1.2589;(7)the shape of various patches in the landscape was simple,and was disturbedby external,the MSI index was low belowed1.5.Looked from the land use type:(1)the main woodland and cultivated had thehighest level of aggregation with obvious superiority,their characteristic was largearea,high accumulation,and small discreteness,but severe fragmentation;(2)the levelof aggregation value of the unplan woodland with small scale was26.62;(3)the levelof aggregation of the shrub land, the young afforested land and the stocked land,wereclose but big gap from the main woodland,because of their small area,lowaccumulation,and large discreteness;(4)the level of aggregation and accumulation ofthe construction land was lower,its area only occupied the landscape area with11.68%;(5) the level of aggregation of the unutilized land was the lowset,it mainlymanifested in the smallest area,the lowest accumulation,and the largest discreteness.On the basis of theory and principle about landscape pattern optimization, andcombined with problems of Chaotian county s landscape pattern, includes:woodland resource was abundant,but its level of aggregation was uneven,and thediscreteness between the stocked land and the young afforested land was large; highreclamation ratio land had severe fragmentation;the total area of unplan woodlandwas large with small scale; the specific gravity and aggregation degree of constructionland was low; unutilized land appeared small and scattered; all kinds of land use type was disturbed by external.To improve landscape ecological environment presentconditions and economic capacity, promote the sustainable development of Chaotiancounty for purpose, this paper gave several relevant proposal to the landscape patternof land use of Chaotian county:adjust the composition structure of woodlandreasonably;determine owner of unplan woodland;protect cultivated field,strengthencapital construction and increase the productive capacity on and of farmlands,andreturning land for farming to forestry with mountain area;develop the unutilized landto improving land utilization rate; overall arrangement country construction land andreduce rural residential area;develop traffic and transmission land and accelerateconcentrated urbanization developing to improve livelihood and maintain thebalanced development and sustained development of the eco-system. |
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