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《Forestry and Ecological Sciences》 2018-02
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Analysis characteristics of mixed forest of Pinus tabulaeformis and Betula platyphylla at different slope positions

NIU Qinghua;GUO Yujia;LU Guiqiao;GU Jiancai;College of Forestry,Hebei Agricultural University;  
In this study,Pinus tabulaeformis and Betula platyphylla mixed forest in North Ditch Forest Farm was used as an object with the standard survey method,sample harvest method,full excavation method and variance analysis method to investigate the impact of different slope positions on biomass of trees,shrubs,herbs and litter layer,and the gowth of Pinus tabulaeformis and Betula platyphylla mixed forest.The results showed that DBH and height of all mixed species in downhill were higher than those in middle and upper slope;the variation of tree biomass of mixed stands in different slope positions was as follows:downhill was the largest,middle slope was the second,and uphill was the worst.The change trend of shrubs,herbs and litter was just opposite to that of tree layer;all levels of biomass proportion from large to small in different slopes:tree layer,litter layer,shrub layer,herb layer,and the tree layer accounted for an absolute advantage.The biomass of lower slope,middle slope and upper slope accounted for 95.51%,92.03% and 90.08% of the total biomass of each slope,respectively.The main species of the shrub layer were Betulaceae,Rosaceae,Caprifoliaceae,Leguminosae and Ericaceae.The variation of plant biomass in the slope position of Betulaceae and Rosaceae was as follows:uphill was the largest,middle slope was the second,and downhill was the lowest,Caprifoliaceae was just the opposite of that,and rule of plant biomass of Leguminosae and Ericaceae in different slopes was as follows:middle slope was the largest,uphill was the second,and downhill was the lowest.But in the different slopes,the biomass of Rosaceae plants was the highest,and the biomass of Leguminosae and Ericaceae plants was the lowest.The distribution of different organ biomass of Pinus tabulaeformis in different slopess from big to small was stem branch,root and leaf,however,distribution of Betula platyphylla′s organ biomass in different slope positions from big to small was stem,root,branch and leaf.The trend of the distribution rate of Pinus tabulaeformis′s and Betula platyphylla′s stem in different slope positions was:the downhill was the largest,the middle slope was the second,and the uphill was the smallest,while the distribution rate of branch,leaf and root was opposite to the stem.It showed as follows:the uphill was the largest,the middle slope was the second,and the downhill was the smallest.
【Fund】: 国家重点研发计划课题(2016YFC0500802);; 河北省高等学校科学技术研究计划(Z2015079)
【CateGory Index】: S791.254;S792.153
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