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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (1): 26-36.doi: 10.7525/j.issn.1673-5102.2018.01.004

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The Different Altitude Gradient Change Rules of the Main Shrub Community in Arid Valleys of the Bailongjiang River with Different Slope

WANG Fei1,2, TU Cai-Yun1,2, CAO Xiu-Wen1,2, LIU Jin-Qian1,2, YANG Yong-Hong1,2, ZHANG Tao1,2, QI Hao1,2   

  1. 1. Institute of Forestry Science, Bailongjiang Forestry Management Bureau of Gansu provience, Lanzhou 730070;
    2. Gansu Bailongjiang National Forest Ecosystem Research Station, Zhouqu 746300
  • Received:2017-05-17 Online:2018-01-15 Published:2018-01-06
  • Supported by:
    Gansu youth science and technology fund project(145RJYK278);Gansu forestry science and technology project(2015kj048,2015kj051,2016kj058,2016kj062)

Abstract: The change rules of different slope on the structure characteristics and species diversity of the Main shrub community in arid valleys of the Bailongjiang River were studied with Quadrat survey method. Aim to understand the vegetation characteristic and Species diversity changes from different elevation gradient of arid valleys in bailongjiang river, It will provides the theory basis for vegetation restoration in this region.Results show that: (1)species are different in the same slope of different altitude gradient, as well as in the different slope of same altitude gradient. with the increase of altitude,the species of different slope show that increased after decreased first, The main vegetation types are also different in the same slope of different altitude gradient; (2)With the increase of altitude gradient, α-diversity of shrub community and α-diversity of herb community in different slope all showed that a trend from rise to decline . Correlation analysis was carried out on the α-diversity index, contribution rate of species diversity for the species diversity is the largest,it is showed that the richness index(D1, D2)> ecological dominance index(SN)> interspecific opportunity index(H)> evenness index of community(R); (3)With the change of altitude gradient, β-diversity Whittaker index of the main shrub community have less change in different slope, the maximum appeared at an altitude of 1 250-1 650 m,Routledge and Cody β-diversity index between an altitude of 1 450-1 650 m reache maximum, but generally presents the waveform changes. β-diversity of herb community have larger change, At an altitude of 1 050-1 250 m, β-diversity of herb community in the sunny slope reaches maximum. At an altitude of 1 250-1 450 m,β-diversity index of herb community in the semi-shady slope and semi-sunny slope reaches maximum, β-diversity index of herb community in the semi-shady slope and semi-sunny slope were higher than sunny slope. Species diversity α and diversity β are different that in Different slope directions and different altitudinal gradients in dry valleys of Bai Long River and different slope directions have a certain correlation with the change of altitudinal gradient, species diversity α and diversity β indicating that elevation and slope directions are one of the main factors affecting biodiversity.

Key words: arid valleys, shrub, altitude, slope direction, α-diversity, β-diversity

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