Water quality restoration for the conservation of Sarobetsu mire

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概要

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• The shrinking of high-moor bogs around the globe has become an important problem, because these areas are ecologically valuable but very vulnerable to external impact. Sarobetsu Mire is a case in point. Its ecosystem is gradually losing its natural state because of human perturbations in the surrounding areas, which have caused water levels to decrease, and threaten to change the entire mire ecosystem. As a consequence, a new non-native fauna, Sasa sp., is growing rapidly and invading areas of natural species.<BR> Previous research has shown that the quality and levels of the groundwater in the Sarobetsu Mire have a strong relationship with the surrounding vegetation, especially with the change of species, from sphagnum to Sasa sp. At Point E, where natural sphagnum still remains dominant and the groundwater levels are still high, less inorganic nutrients for plant growth are available. The WW and the NC points however, where sasa has already invaded, both have high nutrient contents. At point NC especially, an area suspected of being affected by external inflow from outside the mire, the high pH and high nutrient content of the water differs greatly to the natural condition of the Sarobetsu bog-mire. In this research we installed dams in the natural channel and found that by increasing the water level, mineralization by micro-organic activities can be restrained and the sasa growth can be minimized. It also showed that raising the water level could hinder growth of sasa brought about by mineralization from micro-organic activities, and enhanced by soil dryness and migration.

• 日本熱帯生態学会の論文

日本熱帯生態学会 | 論文

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