Evaluation of the recovering process of Phragmites australis after cutting by the dynamic regrowth model and the validation by the observation

Abstract

Mowing is a general reed bed management method for the restoration of devastated wetlands and the maintenance of plant diversity in wetlands. Based on the reed growth model that has been developed in recent years, the reed reed length model as a wetland management method Was developed based on the observation results. In the wetlands of Akigase Park in Saitama City, Saitama Prefecture, three years of observations were carried out to investigate the recovery process of reed beds from cutting. Although it had the most adverse effect on the growth of Phragmites auspicus, the proportion of leaves of regenerated shoots after cutting was increased from 0.28 to 0.56 for June and July cutting. June cutting reduced shoot height and dry weight and rhizome dry weight. On the other hand, Yoshi recovered from summer cutting in about 2 years, and reed bed management was performed every 1 or 2 years. The improved reed-cutting regeneration length model, which was shown to be necessary, well reproduced the observation results and the data from the previous literature regarding cutting and field burning. As a result of model calculation, the reeds that grow in a well-nourished environment It was shown that it recovers from cutting in about 3 to 4 years, but it may take 10 years or more for reeds that grow in poorly nourished environments.