Structure and function of ecosystems in a river for applying to environmental assessment.

用于环境评估的河流生态系统的结构和功能。

基本信息

批准号：
11480143
负责人：
KAMADA Mahito
金额：
$ 9.09万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

1) Periodical cross-sectional data of the riverbed was arranged as the data-base. Then geomorphologic change of the riverbed was clarified for past 30 years. The riverbed topography had greatly fluctuated during first 15 years due to sedimentation in dams which were constructed upstream and gravel digging downstream. It has become stable during the second 15 years, and area occupied by vegetation on bars has expanded. 2) Distribution of six species of Grapsidae and five species of Assimineidae has been restricted within reed communities. From an experimental treatment, it was suggested that coexisting mechanism without competitive exclusion existed for two species of Grapsidae. 3) The distribution of macro-benthic species corresponds with environments, such as salinity and sediment size. Biomass or occurrence possibility of the species was predictable in some extent by using multi-regression analysis, logistic-regression analysis and/or quantification theory (type II). 4) Distribution, size and shoot density of Bolboschoenus planiculmi patches was compared temporally and spatially. Patch size in 2001 was greatly decreased from 1999, particularly in populations distributed around river-mouth and uppermost area (ca.14 km from river-mouth). Shoot growth and amount of seed production were small at sites with high salinity and/or coarse-stony sediment. Expansion of the population is mainly owned by root-sucker, while seeds contribute to colonize to new sites. 5) Hydraulic model to simulate dispersal process of Bolboschoenus planiculmi seeds was developed.

1）将河床的定期横截面数据排列为数据库。然后，在过去30年中阐明了河床的地貌变化。由于在上游建造的水坝和下游砾石挖掘的大坝沉积，在头15年中，河床的地形大大波动。它在第二个15年中已经变得稳定，植被占据酒吧占据的区域也在扩大。 2）在芦苇群落中限制了六种grapsidae和五种杂物的分布。通过实验治疗，提出了两种Grapsidae的共存机制，没有竞争性排除。 3）宏 - 丝质物种的分布与盐度和沉积物大小等环境相对应。通过使用多回归分析，逻辑回归分析和/或定量理论（II型），可以在某种程度上预测该物种的生物量或发生可能性。 4）在时间和空间上比较了Bolboschoenus Planiculmi斑块的分布和芽密度。 2001年的补丁大小比1999年大大减少，尤其是在河口和最上面区域（距河口14公里）周围分布的人群中。在高盐度和/或粗岩石沉积物的地点，芽的生长和种子产量的数量很小。人口的扩大主要由根 - 萨克人所有，而种子有助于殖民到新地点。 5）开发了液压模型，以模拟Bolboschoenus Planiculmi种子的分散过程。