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    沈阳城市森林三维绿量测算

    Tridimensional green biomass measures of Shenyang urban forests

      摘要
    • 摘要: 为了探讨城市森林三维绿量的测算方式及精度,该文利用2001年8月沈阳市真彩航片和抽样调查,借助ARC/GIS,以“立体量推算立体量”的方法测算沈阳城市森林三维绿量.结果表明,不同城市森林类型的单位面积三维绿量以风景游憩林最高,为5.35 m3/m2,附属林4.93 m3/m2,道路林3.65 m3/m2,生态公益林3.62 m3/m2,生产经营林2.35m3/m2;城市森林分布区的单位面积三维绿量为4.25 m3/m2;城区单位面积城市森林三维绿量为0.35 m3/m2.沈阳城市森林总体三维绿量为161 296 716.85 m3,其中附属林为60 116 966.36 m3,占37.27%,生态公益林43 321 771.43 m3,占26.86%,风景游憩林30 482 879.04 m3,占18.90%,道路林23 841 208.75 m3,占14.78%,生产经营林3 533 891.27 m3,占2.19%.经检验,该方法精度达到85.50%(α=0.05).

       

      Abstract: In order to study the measurement method of urban forest tridimensional green biomass(TGB) and its ratio of precision with true color aerial photo and ARC/GIS,using a method of "estimating tridimensional volume by tridemensional volume",the TGB of urban forests of Shenyang in August 2001 was measured.TGB per unit area of recreation forests was 5.35 m3/m2,which was the highest of urban forest types.The TGB of subordinated forests,road forests,ecological and public welfare forests,and production and management forests were 4.93,3.65,3.62 and 2.35 m3/m2.TGB per unit area in urban forest distribution area was 4.25 m3/m2 and that in Shenyang urban area was 0.35 m3/m2.Total TGB of Shenyang urban forests was 161 296 716.85 m3.Subordinated forests,ecological and public welfare forests,landscape and relaxation forests,road forests,and production and management forests accounted for 37.27%,26.86%,18.90%,14.78% and 2.19% of the total,and their TGB were 60 116 966.36,43 321 771.43,30 482 879.04,23 841 208.75 and 3 533 891.27 m3 respectively.Having checked this method,its ratio of precision was up to 85.50%(α=0.05).

       

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