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Development of aquatic plant model and analyses of carbon & nutrition dynamics in lake/river environment

水生植物模型开发及碳分析

基本信息

批准号：
14550509
负责人：
ASAEDA Takashi
金额：
$ 2.18万
依托单位：
Saitama University
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 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550509/
关键词：
Emergent plant Ecological modeling Phragmites australis Typha Zizania latifolia Potamogeton perfoliatus Plant management Lake restoration 生長モデルヨシPhragmites australis ヒメガマTypha angustifolia マコモZizania latiflia ヒロハノエビモ Potamogeton p

项目摘要

Aquatic plants have an important role in water quality in lakes and rivers. Difficulties to evaluate efficiency, however, have made it hard to introduce the plants system into practical managements. Under such circumstances, necessary datasets were obtained from the field observation and then sub-modules were made, aiming to finally develop the mathematical tool available in management. In the field observation, material translocation system was measured for some of important emergent species such as Phragmites australis, Typha augustifolia and Zizania latifolia, by sampling shoots and rhizomes monthly. It was also obtained for the population cut in summer time, often conducted to harvest nutrient from water. Based on these results, the growth model was developed for these species. Then the model was applied to obtain important characteristics regarding the growth characteristics under various conditions, efficiency in nutrient harvesting, nutrient cycle through the plant body, etc. The following results were obtained : 1)Carbon, nitrogen and phosphorus cycles was obtained in the Phragmites australis stand in Nieseidlarsee in Austria. 2)Latitudinal effects were obtained for above and belowground biomass of Typha spp. in the equilibrium, stage under a fixed seasonal meteorological patterns with respect to latitude. The function of secondary shoot formation was elucidated as latitude specifically. 3)The competition of two emergent species was evaluated by the model. 4)The amount of harvested nutrients by cutting was evaluated by the model and the best cutting time to remove nutrients was obtained. Other than these results regarding emergent species, the competition between the submerges species, Potamogeton perfoliatus and epiphyton, and the accumulation rate of organic materials in the flowing water by Potamogeton spp. were obtained.

水生植物对湖泊和河流的水质具有重要作用。然而，效率评估的困难使得工厂系统难以引入实际管理。在这种情况下，通过实地观察获得必要的数据集，然后制作子模块，最终开发出管理中可用的数学工具。在野外观测中，通过每月对嫩芽和根茎进行采样，对芦苇、香蒲、茭白等一些重要挺水植物的物质易位系统进行了测量。它也是针对夏季人口减少而获得的，通常是为了从水中获取营养物质。根据这些结果，为这些物种开发了生长模型。然后应用该模型获得了各种条件下的生长特性、养分收获效率、植物体内养分循环等重要特征。获得了以下结果：1）在奥地利Nieseidlarsee的芦苇林中获得了碳、氮和磷循环。 2)获得了香蒲属地上和地下生物量的纬度效应。在平衡阶段，处于相对于纬度的固定季节气象模式下。具体阐明了纬度对次生芽形成的作用。 3)利用该模型对两个新兴物种的竞争进行了评价。 4)通过模型评价了刈割收获养分的量，得出了去除养分的最佳刈割时间。除了这些关于挺水物种的结果外，沉水物种、穿叶眼子菜和附生植物之间的竞争，以及眼子菜属在流水中有机物质的积累率。获得。