巻号一覧
55 巻 (1999)
- 4 号 p. 307-
- 3 号 p. 235-
- 2 号 p. 101-
- 1 号 p. 1-
55 巻, 4 号
選択された号の論文の9件中1～9を表示しています
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水間 満郎1999 年 55 巻 4 号 p. 307-314
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーThe meteorological data obtained in the Sino-Japan joint research project (HEIFE) are utilized for the analysis of the local wind system in the project area in northwestern China. The local winds appearing at the respective observational sites in the summer days with fine weather and weak synoptic-scale forcing are made clear. The katabatic wind is predominant in the foot of the Qilian Mountains. When the katabatic wind is prevailing, the ground surface temperature seems somewhat lower than the air temperature in the lowest layer of the atmosphere. The air temperature in the location where there is a noticeable katabatic wind is considerably higher than that in the location where the air tends to be stagnant on clear nights. Harmonic analysis of the temporal variation of wind speed and temperature shows no significant periodicity of the cold air drainage. The periodic components shorter than 100 minutes, if they exist, have the amplitudes of, at most, 0.6m/s and 0.25°C for wind speed and temperature, respectively, in the drainage.抄録全体を表示PDF形式でダウンロード (1085K) -
黒瀬 義孝, 長田 健二, 大場 和彦, 丸山 篤志1999 年 55 巻 4 号 p. 315-322
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーTo clarify the spatial distribution of solar radiation, a model to estimate the potential incoming solar radiation with 50m grid size was developed. The model is based on individual calculation of direct and diffuse solar radiation accounting for the effect of topographic shading. Using the elevation data in the area with radius 25km, which was offered by the Digital Map 50m Grid, the effect of topographic shading is estimated as angle of elevation for surrounding configuration to 72 directions.
The estimated sunshine duration under clear sky conditions agreed well with observed values at AMeDAS points of Kyushu and Shikoku region. Similarly, there is a significant agreement between estimated and observed variation of solar radiation for monthly mean conditions over complex terrain. These suggest that the potential incoming solar radiation can be estimated well over complex terrain using the model.
Locations of large fields over complex terrain agreed well with the area of the abundant insolation condition, which is defined by the model. The model is available for the investigation of agrometeorological resources over complex terrain.抄録全体を表示PDF形式でダウンロード (3237K) -
宮下 晃一, 米谷 俊彦, 武田 和義1999 年 55 巻 4 号 p. 323-328
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーRegional specialities of world wide barley cultivars under high temperature conditions were studied, using surface temperatures of plant canopy measured by an infrared thermometer. A total of 274 barley cultivars consisting of 5 north American cvs, 11 north African cvs, 19 Chinese cvs, 37 Ethiopian cvs, 35 south west Asiatic cvs, 30 Japanese cvs, 30 Korean cvs, 21 Nepalese cvs, 18 Turkish cvs, and 68 European cvs were randomly taken from the stocks preserved in the Barley Germplasm Center of Okayama University.
Under nearly zero stress conditions on cloudy days, differences (Ts-Ta) between canopy surface temperatures (Ts) of barley cultivars and ambient air temperatures (Ta) decrease with increasing air temperatures and water vapor pressure deficits, having very high correlation coefficients. On the other hand, under higher air temperature and dry conditions on clear afternoons, Japanese cvs, south west Asiatic cvs, and Nepalese cvs maintained low surface temperatures, but barley cultivars from higher latitudes such as European cvs had the tendency to increase surface temperatures. These imply that the former cvs have the ability to change energy dissipation rates in response to changes in energy absorption but the latter cvs have a limited ability to change the rates of some energy loss mechanisms such as transpiration. Barley cultivars in the habitats with higher annual air temperature and more annual precipitation generally tended to have greater ability to moderate leaf temperatures.抄録全体を表示PDF形式でダウンロード (692K) -
堀本 宗清, 荒木 斉1999 年 55 巻 4 号 p. 329-336
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリークリの凍害防止を目的として, 冬季の根による吸水を抑制し, 樹体の水分を低く保つことによる耐凍性の維持について検討した。クリ樹に対し, 1月に断根処理, 株ゆるめ処理あるいは糖蜜処理を行うと, いずれも吸水抑制効果によって枝水分の増加が抑制, 遅延され, 凍害の防止, 軽減効果が高い。糖蜜処理では処理の20日後に枝水分の差が認められ, 耐凍性の減少が抑制され, 3月下旬まで無処理よりも約2℃優れていた。糖蜜処理は2, 3年生樹では1樹当たり糖蜜5kgの2倍液を株周辺に散布し, 根域土壌中に浸透させる方法で効果が高く, 4年生樹では根域の拡大に合わせて, 1樹当たり糖蜜10kgの2倍液を液肥かん注機で土中に注入すると効果が高くなった。株ゆるめ処理及び糖蜜処理は処理後の生育に対する影響が少なく, 実用的な凍害防止法として利用できる可能性が高いものと思われる。抄録全体を表示PDF形式でダウンロード (3066K) -
菅野 洋光, 小沢 聖1999 年 55 巻 4 号 p. 337-344
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (9726K) -
原薗 芳信, 林 陽生1999 年 55 巻 4 号 p. 345-346
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (1352K) -
広田 知良1999 年 55 巻 4 号 p. 347-350
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (587K) -
橋本 康, 真木 太一, 仁科 弘重1999 年 55 巻 4 号 p. 351-353
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (424K) -
局地気象研究部会1999 年 55 巻 4 号 p. 355-357
発行日: 1999/12/10
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (389K)
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