【摘要】 <正> 一、前言林下红松(Pinus koraiensis)幼树的更新数量和生长速度与红松林的稳定发展休戚相关,并决定着它的演替方向和进程。在小兴安岭广大的天然林区,原始林下红松幼树生长缓慢,死亡率高,亟待解决。以往的研究多集中于光照和气候条件等环境因子的影响,对于大面积原始林区幼树矿质营养代谢规律的研究很少。植物的营养元素贮藏与分配对于生长有密切的关系,各种环境因子都直接或间接地影响到植物的矿质吸收和利用,进而影响各种更多还原

【Abstract】 The storages and distributions of nitrogen and phosphorus of Korean pine seedlings at differentages,organs and stand conditions were studied.It was demonstrated that the N content of Koreanpine seedling under Korean pine stands could not meet the needs of the seedling growth.Especi-ally,the lack of N element in needles of pine seedlings under the virginal forest was a seriousdisadvantage for the seedling growth.It was discovered that overstock biomass and over-canopydensity of virgin forest brought about the disorder of N,P metabolism and slow growth rate ofthe seedlings.A proper cutting method to decrease the biomass storage and canopy density ofpine forest stands was suggested to create a better environment for the seedling growth.更多还原