Chin J Plan Ecolo ›› 2002, Vol. 26 ›› Issue (增刊): 88-92.

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SANG Wei-Guo, SU Hong-Xin, CHEN Ling-Zhi   

  1. Laboratory of Quantitative Vegetation Ecology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
  • Online:2002-09-01 Published:2015-03-09



Abstract Close relation exits between biomass and energy density at forest ecosystems, usually expressed as linear relation. The deciduous broad-leaved forest located in Dongling Mt. area near urban Beijing in warm temperate zone was studied for the biomass and energy. The oak (Quercus liaotungensis) forest was broadly distributed in Dongling Mt., where the height of trees in the forest is no more than 15 m, coverage index is about 80%, composition of dominated tree species are Betula dahurica, Acer mono, Betula platyphylla, and Fraxinus rhynchophylla.
     Biomass or current mass refers to the organic mass per unit area exiting in forest ecosystem during certain periods, it is usually expressed as dry mass. The measurement of forest biomass traditionally was carried out by harvest method. Energy was measured by taking organ samples by harvest and increment core methods, followed by drying, granulating and measuring.

     The biomass and energy partitioning in the warm temperate deciduous broad-leaved forest were analyzed. The partition of biomass and energy in oak forest ecosystems showed that the dominant tree species oak accounts for the biggest percentage in the forest. The biomass of oak forest was 60–200 t·hm–2, tree layer 50–160 t·hm–2. The percentage of tree layer biomass in community was 80%–90%, the percentage of oak biomass is 40%–100%. The forest net primary production was 5–24 t·hm–2. The standing total energy value of the oak community was 83000 kcal·m–2. The tree layer accounted for 96.65%, shrub layer 3.12%, and herb layer 0.23%. The energy density orders at different organs of tree layer were stem, root, branch and leaf, and the ratio was in 4:3:2:1. Shrub layer orders were stem, branch, root and leaf. After the biomass and energy density were analyzed, the concept model was developed for biomass and energy. The concept model would be the basis for abstracted mathematical and computer models will be established.