Explication of community types and habitat characteristics in subalpine coniferous forest

1.苗场山山地带上部和亚高山带下部森林的分布、结构和生境特征。新泻教授。(1)山地毛毛茛带与亚高山冷杉带的分界线海拔沿着地形变化而变化，缓坡毛茛林的上限海拔较高（1700-1750 m）。比以前承认的（约1500 m a.s.l.）在海拔1750 m的山脊上发现了铁杉林。(2)结果表明，水青冈林与水青冈冷杉混交林林下植被特征相似。然而，以针叶树（冷杉和铁杉）为主的森林包含了许多亚高山针叶林的特征。(3)水青冈林（暗棕色森林土）上层土壤养分状况和有机质分解状况相对好于水青冈林（暗棕色森林土）， ...更多信息 不同土壤类型的冷杉林（湿铁灰壤）和铁杉林（干灰壤）.缓坡（海拔1580 m）冷杉-铁杉混交林结构与更新在苗场山的小松原沼泽附近。(1)两种树种在各层位均表现出一定的聚集性。南方铁杉层间分布格局呈正相关。(2)虽然在所有生境中都发现了冷杉的幼苗，但铁杉的幼苗只在树桩或土丘上发现。地面生长的冷杉幼树被认为是连续生长并到达冠层的。(3)树木，特别是铁杉多样性被发现在凸起的栖息地。即使在土壤呈粘土状的栖息地，也发现了冷杉和许多连根拔起的树木。这种连根拔起的树木提供了良好的网站铁杉多样性。(4)通过这种生境条件和更新方式，形成并维持了冷杉-铁杉混交林。少

1. Distribution, structure and habitat characteristics of forests in upper part of montane zone and lower part of subalpine zone of Mt.Naeba, Niigata Professor.(1) The altitude of the boundary between montane Fagus crenata zone and subalpine Abies mariesii zone changed along topography ; the upper limit of Fagus crenata forests on an even slope lay at higher altitude (1700-1750 m a.s.l.) than that of formerly recognized (ca.1500 m a.s.l.). Tsuga diversifolia forest was found at a ridge in the altitude of 1750 m.(2) Characteristics of understory vegetation were similar between Fagus crenata forests and mixed ones consisted of Fagus crenata and Abies mariesii. However, forests dominated by coniferous trees (Abies mariesii and Tsuga diversifolia) contained many species which were characteristic of subalpine coniferous forests.(3) The nutrient condition and decomposition of organic matter in upper soil horizons of Fagus crenata forests (dark brown forest soil) were relatively better than t … More hose of Abies mariesii forests (wet iron podzolic soil) and Tsuga diversifolia forests (dry podzolic soil).2. Structure and regeneration of Abies mariesii-Tsuga diversifolia mixed forest at a gentle slope (1580 m a.s.l.) near Komatsubara Bog in Mt.Naeba.(1) Both tree species showed assemblage in every stratum. The distribution pattern between strata of Tsuga diversifolia showed positive correlation.(2) Although seedlings of Abies mariesii were found at every habitat, those of Tsuga diversifolia were found only on stumps or mounds. Saplings of Abies mariesii growing on the ground were considered to grow successively and reach the canopy layr.(3) Trees especially Tsuga diversifolia were found on convex habitats. Abies mariesii as well as many uprooted trees were found at even habitats where the soil showed clayy texture. Such uprooted trees presented good regeneration sites to Tsuga diversifolia.(4) Abies mariesii-Tsuga diversifolia mixed forest was formed and maintained through such habitat conditions and regeneration style of the two species. Less