Vegetation Vertical Zone Spectrum and Its Features on Southern Slope of Laobai Mountain in Huangnihe Nature Reserve

The southern slope of Laobai Mountain, with obvious differentiation phenomenon of vegetation vertical zones, was classified as five vegetation vertical zones including Quercus mongolica broadleaved forest zone, Pinus koraiensisbroadleaved mixed forest zone, Picea jezoensis dark coniferous forest zone, Betula ermanii forest zone and Pinus pumila forest zone Due to Laobai Mountain being a middle mountain, disturbed by human being and incised by a few gullies, the vegetation vertical zones are narrow A few gullies, rock river and some plant species good ability of adaptation led to fragmentation of the vegetation vertical zone spectrum At the mountaintop, the ground was flat, and fen and mire was developed Contrast to the Baitou Mountain of Changbai Mountains, there were 2° higher in latitude and 995 m lower in altitude, there was a more Pinus pumila forest zone on the southern slope of vegetation vertical zone spectrum in Laobai Mountain Contrast to Yingjili Mountain of Daxing'an Mountains, 7° lower in latitude and 236 m higher in altitude, there was a more Betula ermanii forest zone on the southern slope of vegetation vertical zone spectrum in Laobai MountainIt suggested that the vegetation vertical zone spectrum of Laobai Mountain was in the transition from cooltemperate mixed needlebroadleaved forest zone to boreal needleleaved forest zone