The structure and species composition as well as their changes in a climax forest, dominated byPinus koraiensis-Tilia amurensis andFraxinus koraiensis, were observed with an interval of 10 years. The number of tree sp...The structure and species composition as well as their changes in a climax forest, dominated byPinus koraiensis-Tilia amurensis andFraxinus koraiensis, were observed with an interval of 10 years. The number of tree species was 16 in 1981, which was kept unchanged. Density was increased from 510 to 535 stems/hm2, and basal area from 35.19 to 38.17 m2/hm2. Average stand DBH remained nearly unchanged. The total mortality of the stand was very low, 0.61% per year.Fraxinus andPinus were declining in population size, the highest mortality rate for the former, and the largest death number for the latter.Tilia showed a rapid increasing of 14.9%, and the density of saplings (DBH 3-8 cm) was 71 stems/hm2, led the top among canopy-layer species.Acer mono, similar toTilia, showed a type of continuous regeneration which was represented by the reverse J-shape of DBH distribution and compensation ability to mortality. Sub-canopy species such asAcer pseudo-sieboldianum, Maackia amurensis etc. presented a stable status by self-maintenance. Based on the fact of the decreasing of dominant populations, it is predicted that the composition of the community was changing gradually, the rising of broad-leaved components versus the declining of coniferous species.展开更多
Based on a vast of field investigation on stamps in Tilia broad-leaved Korean pine forest on northem slope of Changbai Mountain, age structure of some major species were studied in this paper. The results showed that ...Based on a vast of field investigation on stamps in Tilia broad-leaved Korean pine forest on northem slope of Changbai Mountain, age structure of some major species were studied in this paper. The results showed that Korean pine population was composed of grouped patches with different ages. There were not strict intervals among the dominated generations,and the curve of age structure often had two or more peaks. The distribution of broad-leaved species in natural Korean pine forest was grouped or scattered, and age distribution was also uneven-aged. There existed close relation between quantity of broad-leaved species and Korean pine. So, it shaped multi-storied and uneven-aged mixed forest. The model of age structure and growth demonstrated their passive correlation, but growth became slow when woods had reached old age.展开更多
文摘The structure and species composition as well as their changes in a climax forest, dominated byPinus koraiensis-Tilia amurensis andFraxinus koraiensis, were observed with an interval of 10 years. The number of tree species was 16 in 1981, which was kept unchanged. Density was increased from 510 to 535 stems/hm2, and basal area from 35.19 to 38.17 m2/hm2. Average stand DBH remained nearly unchanged. The total mortality of the stand was very low, 0.61% per year.Fraxinus andPinus were declining in population size, the highest mortality rate for the former, and the largest death number for the latter.Tilia showed a rapid increasing of 14.9%, and the density of saplings (DBH 3-8 cm) was 71 stems/hm2, led the top among canopy-layer species.Acer mono, similar toTilia, showed a type of continuous regeneration which was represented by the reverse J-shape of DBH distribution and compensation ability to mortality. Sub-canopy species such asAcer pseudo-sieboldianum, Maackia amurensis etc. presented a stable status by self-maintenance. Based on the fact of the decreasing of dominant populations, it is predicted that the composition of the community was changing gradually, the rising of broad-leaved components versus the declining of coniferous species.
文摘Based on a vast of field investigation on stamps in Tilia broad-leaved Korean pine forest on northem slope of Changbai Mountain, age structure of some major species were studied in this paper. The results showed that Korean pine population was composed of grouped patches with different ages. There were not strict intervals among the dominated generations,and the curve of age structure often had two or more peaks. The distribution of broad-leaved species in natural Korean pine forest was grouped or scattered, and age distribution was also uneven-aged. There existed close relation between quantity of broad-leaved species and Korean pine. So, it shaped multi-storied and uneven-aged mixed forest. The model of age structure and growth demonstrated their passive correlation, but growth became slow when woods had reached old age.
