Abstract
Although Konbukuro-marsh on the Hokuso-tableland is located in urban area, there are valuable habitats of rare hygrophytes in Chiba Prefecture. The purpose of this study is the consideration of conservation measures for Malus Sieboldii Rehd. through the study of growth state in relation to environmental conditions. Malus Sieboldii bloomed over 150cm and high flower-set grade was observed under the canopy with higher gap ratio than 10%. Fruit-set rate was low. More than half of blooming trees was sterile. The fruit-set rate of 3/4 of blooming trees was less than 5%. Seedlings were few and those were established almost on bare soil without litter. In order to conserve Malus Sieboldii, it should be necessary to take measures, such as vegetation control and artificial disturbance to preserve the safe site of seedlings.
