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。在旧时代，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健康的另一卷农业变得更加重要。此外，人们还认识到，森林和草地对保护生物多样性具有作用。本研究对农用地附近植被的环境效应进行了评价。从弃耕后的时间长短、割草次数、践踏强度等方面来看，各区草本植物种类繁多，但地区间差异较小。模型草的植被是在容器中生长的。研究了不同割草频率对水青藤、艾蒿和苦菜生长的影响。结果表明，黄花菜和艾蒿对修剪有一定的耐性，而苦菜对修剪有一定的耐受性。研究了1947年、1970年和1993年绘制的1/25000地形图上大阪森南地区竹林分布的变化。统计竹林立地数，测算各立地面积。1947年，该地区的竹林总面积约为187公顷。到1993年，这一面积增加到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.