Basic field experiment for the compatibly of sustainable agriculture and regeneration of RDB populations in rice paddy

结果和讨论如下：1)RDB动植物的野外种群动态对于巨水虫和Cybister的潜水甲虫的种群，可以用它们的标记和重新捕获的方法来检测它们在试验区的栖息地利用、不同格局和迁徙和残留率。虽然每个物种在生活周期中都利用稻田、池塘、灌溉方式和河流等多种栖息地，但它们的主要繁殖地是稻田。就RDB植物物种而言，它们的栖息地是稻田、池塘和灌溉方式。然而，我们的新发现表明，它们可以在旱稻田生长良好，其栖息地主要是永久水域，如池塘或湿地型稻田。2)中隔水平RDB种群再生实验在大学农场，对每个RDB种群的栖息地条件进行了分析。尤其是免耕覆盖豆类的丽莎水稻栽培方式，其水虫种群种类比常规水稻生产系统更为丰富。此外，在RDB人口田间地区的实践检验中，可以利用与传统作物相结合的多样化种植制度来更新RDB种群。3)农业生物多样性的初步理论根据两种检验的整合，日本农业中最有效的生态环境是以较低的投入减少对RDB种群的干扰的可持续水稻生产。在稻田肥沃的情况下，多样化的种植制度与传统品种种植，如丽莎领导下的红型水稻。

Results and discussions of two examinations are shown as followed;1) Field population dynamics of RDB animals and plantsFor populations of the Giant water bugs and the Diving beetle species of Cybister, their marked and recaptured method could be applied to detect their habitat use, disparsal pattern and immigration and residual rate in examined area. Although each species use multi-habitat including rice fields, pond, irrigation way, and river in their life cycles, their main reproductive place was rice paddy fields for food production. In the case of RDB plant species, their habitat were rice paddy fields, pond and irrigation ways. However, they can grow well in dry rice paddy fields as our new finding, of which habitat is mainly permanent water such like a pond or wet-type rice fields.2) Experiments for regenerating RDB populations in mesocosm levelIn university farm, some experiments were carried out for analyzing habitat condition for each RDB populations. Especially in LISA rice cultivation method with no-tillage and legume mulching, diverse water insect populations were abundant than conventional rice production systems. Furthermore, in practical examinations in RDB population field area, diversified cropping systems with traditional crops might be available for regenerating RDB populations.3) Tentative theory of agro-biotopeAcordings to integration of two kinds of examinations, the most effective biotope for practical situation in Japanese agriculture is sustainable rice production with lower input which reduce disturbance to RDB populations. In the case of abundant rice fields, diversified cropping systems cultivated with traditional variety such like a red-type rice under LISA.