Biological diversity on paddy-side grassland and Vegetation Management by Mowing

稻田边堤在日本传统农业中除了蓄水外还有重要的功能。比如说，那还是草原上，农民拿草当牲口的地方。因此，稻田一侧的草地得到了精心的管理，因此它们在各种生物的栖息地中也起着重要的作用。但最近，农业的方式已经被机器改变了。被犁拉着的牛已经失去了位置。这些变化危及稻田作为农业生态系统生物多样性保护区的价值。对稻田草地的生物学价值进行了调查研究.对福井、新泻、爱知、熊本等地的稻田侧草群落的区系组成进行了调查.连续测定群落内外的温度和光照.在5 ~ 12月对稻田草地的地上生物量进行了调查。并对刈割后1个月内的再生长生物量进行了调查.在4 ~ 11月间对河滩地草地进行不同频率、不同季节的刈割，每月一次、隔月一次、一年一次，但不分月份。根据研究结果，提出了一些植被管理的方法。

The paddy side banks had important functions beside holding water for Japanese traditional farming. For example, those were even places of the grasslands where farmers took grass for livestock. Therefore, the grasslands on the paddy side had been managed carefully, consequently they also play an important part in the habitats of various life. But recently, agricultural style had be changed by machines. The cattle which had been pulled a plow had lost their position. These changes endangered the value of paddy side in agro-ecosystem as conservation area for biological diversity. Some investigations were made to reveal the biological value of paddy side grasslands.1. The floristic composition of the paddy side grass community were investigated at several region, Fukui, Niigata, Aichi and Kumamoto.2. Temperature and the light inside and outside of the communities were measured continuously.3. The above ground biomass of paddy side grassland were investigated from May to December. The re-growth biomass in a month after mowing were also investigated.4. The grassland in a river flat were mowed at different frequencies and at different season, once in every month, once in every other month, once in a year but different month from April to November.5. According to the results some methods for vegetation management were shown.