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Effects of dynamic site conditions on plant succession in the riparian area with a large-scale collapse in the upstream area

动态立地条件对上游大规模塌陷河岸地区植物演替的影响

基本信息

批准号：
13660144
负责人：
OHSAKA Okihiro
金额：
$ 1.6万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13660144/
关键词：
riparian area dynamic site condition aerial photo interpretation probability rainfall year plant community structure succession 渓畔林流路堆積地形林分構造

项目摘要

The purpose of this research is to clarify the influence that the dynamic site condition impacts on the plant succession in the riparian area that has a large-scale collapse place in the upstream area.Investigation area is on the riparian area in Ohya River, the upper reach of Abe River, which sediment transport is constantly expected, because the place has a large-scale collapse in the upstream area. The plant community structure and the succession were surveyed and the area of the disappearance and recovery of the forest place were investigated by the aerial photograph interpretation. In addition, the influences that the frequency and the strength of the disturbance that made rainfall an index influence on the succession were discussed.Based on the species composition and sere the forest in the research sites was classified in the 4 stages. The first stage is community of pioneer species, Alnus filma, Alnus maximowiczii, Salix sachalisesis and passed 10 years from the period of invasion and has not experienced the 10-30 year probability rainfall (400-500mm) yet. However, the stands that are advanced to the second and third stages have experienced the probability rainfalls. The second stage is 10 to 25 year three-story forest, next-generation species-Carpinus in the middle story, Quercus mongolisa var.grosscratta and Acer forming the ground story under the canopy of pioneer species. The third stage is 25-45 year old stand dominated by side species and Acer species in the ground story. The fourth stage is 45 year or above forestland covered mostly by Acer species. As a result of this research, it became clear that riparian plant communities in Ohya River is related with the intensity and frequency of disturbances.

本研究的目的是明确动态立地条件对上游发生大规模崩塌的河岸带植物演替的影响。调查区域位于阿部川上游的Ohya川河岸带，由于上游发生大规模崩塌，预计该河岸带将不断发生泥沙输运。通过航片判读，调查了植被群落结构和演替，调查了林地消失和恢复的面积。此外，还讨论了以降雨量为指标的干扰频率和干扰强度对演替的影响，并根据物种组成和演替顺序将研究区森林划分为4个演替阶段。第一阶段为先锋种Alnus filma、Alnus maximowiczii、Salix sachalisesis群落，从入侵开始到现在已经过了10年，还没有经历过10-30年概率降雨量（400- 500 mm）。然而，进入第二阶段和第三阶段的看台已经经历了概率降雨。第二阶段为10 ~ 25年生的三层林，下一代树种鹅耳枥在中层，蒙古栎和槭在先锋树种的树冠下形成地面层。第三阶段为25-45年生林分，林分地上层以边材和槭属树种为主。第四阶段为45年以上的以槭属树种为主的林地。研究结果表明，Ohya河河岸植物群落与干扰强度和频率有关。