从生态地理特征论中国东北样带_N_省略_CT_在全球变化研究中的科学意义_倪健.pdfVIP

19 5 　　　　　　 Vol. 19, No. 5 1999 9 ACTA ECO LOGICA SIN ICA Sept. , 1999 ( N ECT) 倪　健,李宜垠,张新时 (,　100093) : (N ECT) ( IGBP)。 112° 130° 30′ 43°30′, 1 600km, 42°～ 46°, 300km, / ,,、 、 3: 、。 ,、、、、、、 。 。 : ; ;;; ( ) The scientific significance of the north east China transect NECT to global change study by its ecogeographical characteristics ( , , N I Jian, LI Yi Yin, ZHAN G Xin Shi　 Laboratory of Quantitative Vegetation Ecology Institute of Botany Chinese Academy of Sciences,Beij ing 100093,China) Abstract: North East China Transect ( NECT) is listed as one of the first set of IGBP Terrestrial Tran . 43°30′, 112° 130°30′, 42° 46°, sects It is placed along the latitute N betw een longtitudes and E latitude and E and approximately 1600 km in length and 300 km in width. NECT is basically a gradient driven by precipi tation or moisture /aridity located in the mid latitude of th e temperate zone. The vegetation zones or biomes wh ere NECT laying on are temperate mixed evergreen coniferous and broadleaved deciduous forest, tem perate deciduous broadleaved forest, farmland and temperate steppe, including three subzones, meadow steppe typical steppe and desert steppe along an east west w ard continuously transitional spatial gradi, , ents,respectively. Th e ecogeographical characteristics along the NECT, including geographical location, to pography, geomorphology, climate, soil, pattern of land use, the vegetation types, main communities and dominants dist ributional pattern of vegetation in Holocene Megathermal and initial gradient analysis were, , given for the w hole transect. These characteristics present the significant gradient dist ribution in longi