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No.3 (1956/7) >

 
Title :土が乾燥するにつれてモクマオウ属(6樹種)のマキツケ苗の水分関係はどうかわるか
Title alternative :Response of seedlings of Casuarina (6 species)to soil dryness.
Authors :大山, 保表
Authors alternative :Oyama, Hohyo
Issue Date :Jul-1956
Abstract :1) The relationship between the change of water content of soil and the changes of transpiration and water content of the seedlings of Casuarina (6 species) was studied. 2) The amount of transpiration decreased gradually until the point a little below the field capacity, from which point it started decreasing very rapidly. The amout of transpiration is extremely small near the permanent wilting percentage and the amount didn't decrease any more below this point. 3) The amount of water content of the seedlings decreased gradually until the permanent wilting percentage, below which it decreased very rapidly. 4) The transpiration ratio between the average value of three measurings above field capacity of soil water content and that below permanent wilting percentage is almost in inverse relation to the seedling water content ratio between the average value of three measurings above field capacity of soil water content and that below permanent wilting percentage is almost in inverse relation to the seeding water content ratio between the average value of three measurings above field capacity of soil water content and that below permanent wilting percentage; that is to say, the trees with a great decreasing rate of transpiration would have a small decreasing rate of water content. Concerning the decreasing rate of transpiration the order of the trees studied is as follows: C. deplancheana, C. equisetifolia, C. quadrivalvis, C. huegeliana, C. glauca, C. cunnighamia (the first one having greatest decreasing rate). Concerning the decreasing rate of water content, the order was as follows: C. equisetifolia, C. deplancheana, C. quadrivalvis, C. huegeliana, C. cunninghamia, C. glauca (the first one having the smallest decreasing rate). The result of this study is confirmed by the fact that C. equisetifolia and C. deplancheana make poor growth on wet soils but thrive well on dry soils, while C. glauca grows very poorly on dry soils.
Type Local :紀要論文
ISSN :0370-4238
Publisher :琉球大学農家政学部
URI :http://hdl.handle.net/20.500.12000/22011
Citation :琉球大学農家政学部学術報告 = Science bulletin of Agriculture & Home Economics Division, University of the Ryukyus no.3 p.183 -192
Appears in Collections:No.3 (1956/7)

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