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A study on change of vegetation in sediment deposition areas of check dams and prediction of its succession

淤地坝淤积区植被变化研究及演替预测

基本信息

批准号：
14560125
负责人：
ISHIKAWA Yoshiharu
金额：
$ 1.66万
依托单位：
National University Corporation Tokyo University of Agriculture and Technology (2003-2004)Kyoto Prefectural University (2002)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The Rokko Mountains located in the southern part of Hyogo Prefecture was chosen as this study area. Change of vegetation in sediment deposition areas of check dams which were constructed by the Ministry of Land, Infrastructure and Transport from 1928 to 1999 was surveyed by aerial photograph interpretation. Aerial photographs taken in 1969,1979,1989 and 1999 and topographic maps drawn on a scale of one to twenty hundred were used for investigation of vegetation in sediment deposition areas. The years after completion of check dams are smaller, the regeneration are faster. As the size of deposition areas increases, the rate of forestry area tends to decrease. Because if the deposition areas are larger, changes of river bed and water course occur frequently, and the areas suitable for grassland increase.Field investigation was conducted at the 17 check dams in Wachi Town and Ayabe City, Kyoto Prefecture and the Rokko Mountains. At the deposition areas, kinds of plants, micro-topography, types of soil and insolation were surveyed. As the grain size of soil is larger and water holding ability of soil in the deposition areas is weaker than original slope soil, the soil in the deposition areas tends to be dry compared with original slope soil The soil fertility is also lower than original slope, the pace of plant succession is slower. A model of plant succession at the deposition areas was proposed based on this research results.

位于兵库县南部的六高山被选为研究区域。采用航拍解译方法，对1928 ~ 1999年国土交通部建设的拦河坝泥沙淤积区植被变化进行了调查。利用1969年、1979年、1989年和1999年的航拍照片和1至2000比例尺绘制的地形图，对泥沙淤积区的植被进行了调查。止回坝建成后的年限越短，更新速度越快。随着沉积面积的增加，森林面积率呈下降趋势。因为沉积面积越大，河床和河道的变化就越频繁，适合草地的面积就越大。对京都县和町市和绫部市的17座防波堤和六高山进行了实地调查。对沉积物区植物种类、微地形、土壤类型和日照进行了调查。由于沉积区土壤粒度较大，土壤持水能力弱于原坡土，沉积区土壤较原坡土趋于干燥，土壤肥力也低于原坡土，植物演替速度较慢。在此基础上提出了沉积区植物演替模型。