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生物多样性 1993
thestatusofterrestrialecosystemsinchinaKeywords: ecosystem,diversity,forest,steppe,desert Abstract: ？chinaisavastcountrywithcomplexgeographyandclimate.itcrossescold,temperateandtropicalzonesfromnorthtosouth.theplateausandhighmountainsoccupyever50%ofthelandsurface.meanwhile,sincethelatetertiary,mostregionshavenotbeenaffectedbyglaciation,thusthefaunaandfloraarecharacterizedbyhavingmanyendemicandrelicspecies.？therefore,itisconsideredinternationallythatchinaisoneofthemegadiversitycountriesintheworld,wherethenumberofspecise,aswhole,makesupaboutonetenthofthetotalspeciesintheworld.theecosystemstypesarcveryrich.therapidgrowthrateofpopulationandeconomicdevelopmentarethemaincauseforthethreatenednessofecosystems.
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