对不同地位指数和不同林龄杉木林下植物生物量进行了研究。结果表明:除中龄林林下植物生长发育较差外,林下植物总生物量和灌木层生物量基本上随林龄的增加而增加,而草本层生物量的变化较为复杂;不同地位指数和不同林龄杉木及其林下植物的凋落物积累量也存在明显差异,杉木凋落物积累量随林龄的增大而增加。14地位指数的林下植物凋落物量随林龄的增大而增加,而16和18地位指数的林下植物凋落物量除中龄林很少外,其他年龄段也随林龄的增大而增加。应用数量化模型Ⅰ进行分析,结果表明:林分密度、林龄、地形和土壤条件是影响林下植物生物量、杉木凋落物量和林下植物凋落物量的重要因子,尤其是林分密度和林龄。
The biomass of undergrowth plant in Chinese fir plantation stands at different site indices and forest age was studied.The results showed that total biomass of undergrowth plant and biomass of shrub layer were basically increasing with forest age except poor growth of undergrowth plant in middle-aged forest, but the variation of herb layer biomass was more complicated. The accumulation quantity of litter of Chinese fir forest and its undergrowth plant at different site indices and forest ages also existed obvious difference. The accumulation quantity of Chinese fir litter was increasing with forest age, the litter quantity of undergrowth plant at 14 site indices was increasing with forest age, but at 16 and 18 site indices, the litter quantity of undergrowth plant was also increasing with forest age except in middle-aged plantation.Through the analysis of quantitative modelⅠ,the results showed that forest stand density, forest age,topography and soil conditions were important factors affecting biomass of undersgrowth plant, Chinese fir litter and undergrowth plant litter,especially forest stand density and forest age.
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