TECHNICAL EXAMINATION OF IMPROVEMENT METHOD BY CONTROL WATER CHESTNUT COMMUNITY

Abstract

Water chestnut Trapa natans var. japonica causes pollution in marsh by making Hypoxic water and rot after withering. On the other hand, it prevents waterblooms and turbidity. Moreover, it provides habitat to organisms. In this report, we made some experiments by cutting or remaining water chestnut in Lake Inba-numa, Chiba Pref. and assessed the effects of improving water quality and economic efficiency. From result of survey, we proposed effective method of cutting water chestnut.