毛烏素沙地南緣土地覆蓋的動(dòng)態(tài)變化特征研究.pdf

1、澎j西趾農(nóng)林斜捉大學(xué)2007屆攻讀碩士學(xué)位研究生學(xué)位(畢業(yè))論文毛烏素沙地南緣土地覆蓋的動(dòng)態(tài)變化特征研究學(xué)科專業(yè)研究方向研究生指導(dǎo)教師完成時(shí)間墊圈芏量些型匿星垂箕堡!S邀鹽量夔呈劍圍旦塑莖昱蕉廈夔攫———地盟j衛(wèi)■L——STUDYONDYNAMICCHANGEOFLANDCOVERINTHESOUTHMARGINOFMAO、ⅣUSUSANDYLANDSABSTRACTLandresourcesarethemostimportantand

2、essentialnatureresourcestohumanSoanalyzingthelanduseinformationforecastingthelandusechangesarethepremiseofmanaginglandusecorrectlyDynamicmonitoringabouttwoperiodsofvegetationCOVgl“andlanduselandcoversituationoftheyear198

3、6andtheyear2000areperformedseparatelyinthisthesisVegetationcoverandlandusethematicmapsaremadeautomaticallywimthehelpofGISsoftwarepackagesBasedonacomparativeanalysis，itissafetytodrawaconclusionaboutthetrendforlandcovercha

4、ngesofJingbianCountyandalsothemutualconversionratioandtypedoesMainconclusionsarcasfollows：(1)VegetationcoverofthestudyareaismainlybelongingtothemiddleandlowervegetationcovertypeIn1986，thiskindofmiddle—andlowervegetableco

5、verareais44344519hmzof89％thetotalarea；whilein2000itiS39596289hm2of85％thetotalareabuthighervegetationcoverageincreased，itCOVerS54，807hm2morethanthatof1986(2)Accordingtothestatisticsofabsolutelandusechangeareaareaofwoodlan

6、d，grasslandandunusedlandchangeslargelyUnusedlandareareduces12566815hm2theseyears，woodlandandgrasslandareaincreased10801812hm2and9362691hm2FarmlandandlandfortheconstructionchangesalittleFarmlandareadecreases5524933hm2andl

7、andareafortheconstructionincreases1839153h∥Waterareaandsandareachangeintheleast245296hrnzareareducedatwaterareawhilesandareaincreasedl1695hm2：Accordingtotheareachangesofthesedifferentlandusetypefrom1986to2000，theserialsi

8、SunusedlandwoodlandgrasslandwatersarealandforconstructionfarmlandsandAccordingtotherateofchangeoflandusetypesitselftheorderisgrasslandwaterareaforestlandlandfortheconstructionunusedlandfarmlandsand(3)Higherforesflandandg

9、rasslandvegetationcoverageincreasetheimpactofwinderosionInthenorthernJingbiancountysandstormsdaysreducedandthenumberofhighwindsdaysSandstormsweakenedundertheexpansionofthesandcontr01(4)Drivenforceshavemoreimpactonlanduse