巻号一覧
62 巻 (2006)
- 4 号 p. 119-
- 3 号 p. 93-
- 2 号 p. 53-
- 1 号 p. 1-
62 巻, 4 号
December
選択された号の論文の3件中1～3を表示しています
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総 説
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高見 晋一2006 年 62 巻 4 号 p. 119-125
発行日: 2006年
公開日: 2007/06/06
ジャーナル フリーThe law of the minimum, reputedly originally conceived by Justus von Liebig more than one hundred fifty years ago, is a powerful tool in understanding processes with unknown details. The objective of this study was to provide a rationale and some evidence for such a claim. To do so, I assume that the law of the minimum is to be specified as the linear response and plateau (LRP) model: Y = min {X, U}, where X is the limiting variable when it is smaller than U, and U the limiting variable when it is smaller than X. These variables may be either stocks or flows. The study shows that the law thus specified has nothing to do with empiricism but is purely a form of thinking that can be intuitively or logically understood by anyone. As such, it can be applied not only to biological, chemical, and physical processes of academic interests, but also to various processes in our daily lives. In this article, the following examples were given: (ii) the dry-matter partition associated with crop production, (i) crop growth in an environment of abundant resources, and (iii) evapotranspiration in relation to precipitation and net radiation. The law of the minimum is also shown to be useful in analyzing the relationship between sink and source variables to identify the limiting factor.抄録全体を表示PDF形式でダウンロード (846K)
研究論文
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鈴木 賢士, 早川 誠而2006 年 62 巻 4 号 p. 127-132
発行日: 2006年
公開日: 2007/06/06
ジャーナル フリーConvective precipitations in summer often cause agricultural damage by hailfall. On the other hand, it plays an important role as the water resources for agriculture. In this study, we examined the characteristics of summertime convective precipitation in Yamaguchi Prefecture, using the Japan Meteorological Agency weather radar data from 1989 to 1998.
High frequency of radar echo appearances concentrated on the mountainous areas in Yamaguchi Prefecture. First radar echoes appeared frequently around 14JST, and it was 2-4 hours earlier than that observed in Kanto district. Averaged lifetime of radar echoes was 95 minutes, and it was shorter than that in Kanto district. Some of long-lasting (> 2 hours) radar echoes had the maximum radar echo area over 500 km2. Sea breeze wind patterns were detected based on the AMeDAS stations just before the first radar echo appearances. This suggested that the convective precipitation in Yamaguchi Prefecture was triggered by the land-sea breeze circulation. Compared with that in Kanto district, the summertime convective precipitation in Yamaguchi Prefecture had smaller temporal and spatial scales.抄録全体を表示PDF形式でダウンロード (1017K)
資 料
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山田 優, 木村 玲二, 杉村 芙美子, 神近 牧男2006 年 62 巻 4 号 p. 133-137
発行日: 2006年
公開日: 2007/06/06
ジャーナル フリーRelationship between the index with radiometric surface temperature and ratio of actual evapotranspiration (ET) to potential evaporation Ep (= non-dimensional evapotranspiration) was examined in the indoor and field experiment. Index corresponded to the change of ET/Ep. Also, index was related to the leaf water potential and volumetric soil water content within the root zone.抄録全体を表示PDF形式でダウンロード (723K)
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