延边地区天然赤松林单木根系生物量的研究

该文对延边地区天然赤松林单木的根系分布特征以及生物量结构进行了调查．结果表明：赤松根系发达，可塑性强；不同级别根系在根系生物量中所占比例大小顺序为：粗根＞大根＞中根＞小根＞细根，其中粗根和大根占总根量的９０％以上，中、小、细根不足１０％；土壤养分状况对根系总量影响不显著，与中、小、细根的量表现出一定关系；赤松个体生物量中地上部占８０％，根系占２０％，各器官生物量所占比例顺序为：干＞根＞枝＞皮＞叶．

Root Biomass of Natural Japanese Red Pine in Yanbian Area

The root distribution and root biomass of natural Japanese red pine (Pinus densiflora) are investigated. The results show that, Japanese red pine has a well developed root system with high plasticity. The order of biomass proportion in different root classes is: stump > large sized root > middle sized root > small sized root > fine sized root, the proportion of stump and large sized root in total biomass is more than 90%, and the other part is less than 10%. The effects of nutrient status in soil on root biomass are not obvious, there is some correlation between the nutrient of soil and the biomass of middle sized, small sized and fine sized root. The percentage of biomass aboveground and root is 80% and 20% respectively, and the order of distribution proportion of biomass in different organs is trunk > root > branch > bark > needle.