简介:WemappedtheforestcoverofKhadimnagarNationalPark(KNP)ofSylhetForestDivisionandestimatedforestchangeoveraperiodof22years(1988-2010)usingLandsatTMimagesandotherGISdata.SupervisedclassificationandNormalizedDifferenceVegetationIndex(NDVI)imageclassificationapproacheswereappliedtotheimagestoproducethreecoverclasses,viz.denseforest,mediumdenseforest,andbareland.Thechangemapwasproducedbydifferencingclassifiedimageriesof1988and2010asbeforeimageandafterimage,respectively,inERDASIMAGINE.Errormatrixandkappastatisticswereusedtoassesstheaccuracyoftheproducedmaps.Overallmapaccuraciesresultingfromsupervisedclassificationof1988and2010imagerieswere84.6%(Kappa0.75)and87.5%(Kappa0.80),respectively.Forestcoverstatisticsresultingfromsupervisedclassificationshowedthatdenseforestandbarelanddeclinedfrom526ha(67%)to417ha(59%)and105ha(13%)to8ha(1%),respectively,whereasmediumdenseforestincreasedfrom155ha(20%)to317ha(40%).ForestcoverchangestatisticsderivedfromNDVIclassificationshowedthatdenseforestdeclinedfrom525ha(67%)to421ha(54%)whilemediumdenseforestincreasedfrom253ha(32%)to356ha(45%).BothsupervisedandNDVIclassificationapproachesshowedsimilartrendsofforestchange,i.e.decreaseofdenseforestandincreaseofmediumdenseforest,whichindicatesdenseforesthasbeenconvertedtomediumdenseforest.Areaofbarelandwasunchanged.Illicitfelling,encroachment,andsettlementnearforestscausedthedenseforestdeclinewhileshortandlongrotationplantationsraisedinvariousyearscausedtheincreaseinareaofmediumdenseforest.ProtectivemeasuresshouldbeundertakentocheckfurtherdegradationofforestatKNP.
简介:Forthepurposeofofforestation,planninganddevelopmentintheThree-NorthRegion,aseriesof6LandsatTMscenesfrom1996to1997wereusedtoclassifyland-useconditionsinthewholeKorqinSandyLandsateasternpartofInnerMongolia,China,withanareaofabout430×306squarekilometers.Lateron,Siteclassiflcationwasmadeandmappedforthe4southernsandycounties.Theannotationsymbolforeachagglomerationofsiteconditioniscomprisedofsixparts:landunit,landusepattern,soi...
简介:Man-ETourismVillageofDaiNationalityCstomsinXishuangbannaTXMan-ETourismVillageofDaiNationalityCustomsinXishuangbannaByDuanQiwuX...
简介:Forestryindustryisanimportantcommonwealandfundamentalindustry.Forestryenterprisestaketheburdenofecologicalconstructionandsupplyofforestproducts,andeconomicalbenefits,ecologicalbenefits,andsocialbenefitsaswell.However,electronic-business(e-business),asacompletelynewbusinessoperationmodel,willbringgreatopportunitiesandchallengestoforestryenterprises.Onthebasisofsimpleanalysisofe-businessconceptionmodel,theinternalandexternalenvironmentforforestryenterprisestodevelope-businesswasthoroughlyanalysedandresearched,andfinallyeffectivestrategicoptionswereproposed.
简介:Eucalyptusisthemostvaluablecultivatedforestgenusinthetropicalandsubtropicalareasnowadays.Ithasbeenachallengeforforesterstomodelgrowthduetothegeneticvariations,managementregimes,andmultipleproductsgeneratedfromtheplantations.Inthispaper,LogisticequationwasusedtostudythestockgrowthprocessofE.urophylla×E.grandisplantationatageof14with6spacingtreatments.AndthebiologicalinterpretationoftheparametersofLogisticequationwasanalyzed.There...
简介:KafangTownship,XinxianCountyofHenanProvinceislocatedinthehinterlandoftheDabieMountainborderingHenanandHubeiprovinces.Thistown...
简介:Soilmicrobesmaybecriticalplayersindeterminingtheallelopathicpotentialofsomeplants.LowlevelsofplantcommunitybiodiversityinEucalyptusplantationshavebeenattributedtotheallelopathicpotentialofthesetreespecies.TheroleofsoilmicrobesintheallelopathiceffectofleafleachatesofthehybridtreeEucalyptusgrandis9E.urophylla,wastestedinPetridishassayswithBrassicachinensisasareceiverplant.Soilswerecollectedfromeitheralocalgarden(soilA)oraEucalyptusplantation(soilB)andhalfofeachsoilwassterilizedtoremovemicrobes.ThesesoilswerethentreatedwithE.grandis9E.urophyllaleachatesfor0-72h.SeedgerminationofB.chinensiswassignificantlyinhibitedinsoilstreatedwithleafleachatesrelativetountreatedsoils.Theinhibitoryeffectoftheleafleachateswasmorepronouncedinsterilizedsoils.Totalphenoliccontentwasobviouslowerinnonsterileleachatetreatedsoilsthaninsterilesoils.BiomassofB.chinensiswasnegativelycorrelatedwiththetotalphenoliccontentinsoils.OurfindingssuggestthatsoilmicrobescanalleviatetheallelopathicpotentialofEucalyptusandtherebyitsnegativeimpactonplantgrowth.