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首页> 外文会议>Asian conference on remote sensing;ACRS >CAN THE SPAWN OF JAPANESE BROWN FROGS (Ranajaponica, Ranidae) BE A LOCAL ENVIRONMENTAL INDEX TO EVALUATE ENVIRONMENTALLY FRIENDLY RICE PADDIES?
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CAN THE SPAWN OF JAPANESE BROWN FROGS (Ranajaponica, Ranidae) BE A LOCAL ENVIRONMENTAL INDEX TO EVALUATE ENVIRONMENTALLY FRIENDLY RICE PADDIES?

机译：日本褐蛙（Ranajaponica，Ranidae）的数量是否可以作为评估环境友好的水稻小种的地方环境指标？

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Since the 1950s, rice cultivation in Japan has remarkably changed owing to paddy field consolidation for improved irrigation and drainage practices. However, consolidated paddies negatively affected the biodiversity in the agricultural landscapes because of the disjunction between forests and paddies and differences in the land grading level between paddies and concrete waterways. However, recently, the biodiversity at the study site, i.e., Kosaji village, Shiga Prefecture, has started to recover, owing to the efforts of farmers who have been using environmentally friendly products to boost rural development. The farmers of this village have established waterways at the marginal edge of paddy fields that has helped maintain the water levels during winter, thereby providing a stable habitat for aquatic organisms. The primary habitat of the target species-the Japanese brown frog (hereafter, JBF; Rana japonica Boulenger, 1879; Ranidae) -is paddy fields and the surrounding forests. This study aimed to evaluate whether the presence of frog spawns can be used as an indicator of environmentally friendly rice cultivation. The habitat characteristics of JBF oviposition were analyzed in relation to the changes the in paddy fields cultivated using ecofriendly farming practices by spatial analyses. The number of JBF spawns was determined weekly in every paddy field in Kosaji village from February to March 2016. Moreover, the following indicators were monitored in each paddy field: the ratio of still water pool to the parcel of land, order in the line from the valley mouth, paddy size, and existence of marginal canal. Results of geographically weighted regression analyses showed that the environmentally friendly cultivation methods effectively maintained the habitat of JBFs via the first 3 above-mentioned variables. Furthermore, the marginal canals played an important role in raising wet ratio and providing water space in winter.
机译：自1950年代以来，由于稻田合并以改善灌溉和排水方式，日本的稻米种植发生了显着变化。但是，由于森林和稻田之间的脱节以及稻田和混凝土水道之间的土地等级不同，巩固的稻田对农业景观中的生物多样性产生了负面影响。然而，最近，由于农民一直在使用环保产品来促进农村发展，研究地点即滋贺县科萨吉村的生物多样性已经开始恢复。该村的农民在稻田边缘建立了水道，有助于在冬季维持水位，从而为水生生物提供了稳定的栖息地。目标物种的主要栖息地是稻田和周围的森林。这项研究旨在评估青蛙产卵的存在是否可以用作环境友好型水稻种植的指标。通过空间分析，分析了JBF产卵的生境特征与利用生态友好型耕作方法种植的稻田的变化之间的关系。从2016年2月至2016年3月，每周在Kosaji村的每个稻田中确定JBF产卵数。此外，还对每个稻田中的以下指标进行了监测：静水池与土地的比例，从谷口，稻谷大小和边际运河的存在。地理加权回归分析的结果表明，环境友好型栽培方法通过上述前三个变量有效地维持了JBFs的栖息地。此外，边缘运河在提高冬季的湿比和提供水空间方面也起着重要作用。

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