The Evaluation of Agricultural Land on Species Diversity and the Proper Vegetation Management of Nearby Farm

最近农业形势发生了很大变化。在古代，农业的作用是生产食物和原材料。然而，保持环境优美和生态良好的农业的其他卷，变得更加重要。此外，人们认识到，森林和草地具有保持生物多样性的作用。本研究对农田附近植被的环境效应进行了评价.各地区草地植被在弃耕时间长短、刈割频率、践踏强度等方面差异极大，但地区间差异较小.模型草植被在容器中生长。研究了不同刈割频率对白茅、蒿、苦碟子生长的影响。结果表明，白茅属和蒿属植物对刈割具有一定的耐受性，苦碟子属植物对刈割的耐受性较差.本文研究了1947年、1970年和1993年制作的1/25000地形图上所反映的大坂仙南区竹林分布的变化。统计了竹林样地的数量，并测量了各样地的面积。一九四七年，该区竹林总面积约为一百八十七公顷。到1993年增加到207公顷。

Recently situation of agriculture has changed very much. The role of agriculture was production of the food and the raw material in old times. However, the other rolls of agriculture which keep environment beautiful and ecologically sound, became more important. Moreover, it is recognized that the woods and the grassland have effects to keep the biological diversity. In this research, the environmental effects of the vegetation which exist nearby agricultural land were evaluated.1. Extremely various grass vegetation existed in each area according to the time length after farming were abandoned, frequency of mowing, and the intensity of trampling etc. But, the difference between regions was comparatively small.2. The model grass vegetation were grown up in containers. The effect of the difference of the mowing frequency on growth of Imperata, Artemisia, and Ixeris were investigated. As a result, Imperata and Artemisia have tolerance to mowing, but Ixeris was a little tolerant.3. The change in distribution of bamboo forests in the Osaka Sennan district, which had been represented on 1/25000 topographical maps prepared in 1947, 1970, and 1993, were studied. The number of bamboo forest sites was counted and the area of each site was measured. The total area of bamboo forests in the district under examination was about 187 ha in 1947. This had increased to 207 ha by 1993.