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No.33 (1986/12) >

 
Title :亜熱帯地域における常緑広葉樹林の択伐方式による施業法の研究 (XII) : 試験地の土壌の理化学性(演習林)
Title alternative :Studies on the working techniques by selection sistem for the broad leaved forest in the subtropics. (XII) : Physical and chmical properties of soil at expermental plots (Department of Forestry)
Authors :山盛, 直
平田, 永二
新本, 光孝
砂川, 季昭
安里, 昌弘
Authors alternative :Yamamori, Naoshi
Hirata, Eiji
Aramoto, Mitsunori
Sunakawa, Sueaki
Asato, Masahiro
Issue Date :5-Dec-1986
Abstract :与那演習林および西表島の熱帯農学研究施設に設定された択伐試験地ならびに西表国有林内で林分調査を行ったオキナワウラジロガシ林の森林土壌の調査を行った。土壌型の異なる場所で代表的地点を選んで試孔を掘って断面調査を行った。また, 各層位から試料を採取し, 土壌の理化学性の分析を行った。分析結果は表1および表2に示したとおりである。調査結果および文献調査から, 沖縄の森林に主として分布する赤黄色土は, 褐色森林土と比較して容積重が大きく, 透水性が悪く, 粗孔隙量が小さい特徴がみられた。また, 土壌断面にみられた堅密度は堅∿固結が多く, 堅密な土壌であることがいえる。土壌の化学性も褐色森林土に比べて劣るが, 黄色土の一般的性質がみられた。与那と西表の森林土壌のちがいは, 土性によく表れていた。これは母材のちがいによるものと考えられる。この研究をとりまとめるに当たって, 特に土壌の分析に林学科学生下地輝史君の協力を得た。記して深謝の意を表する。
In order to grasp the characteristics of Okinawa forest soils, a survey was carried out at three locations; namely at the Forestry Experiment station in Yona and the Research Institute Tropical Agriculture in the Iriomote Island, both being belonging to the University of the Ryukyus, and at a national forest of Iriomote. The forest at the first and the second locations was mainly consisted of Castanopsis Sieboldii and the third one Quercus Miyagii. The soil profiles were obtained at the typical site of various soil types. And the physical and chemical properties were determined on the soil samples collected from respective soil horizons the plofile. The results were shown in Table 1 and 2. It was found from the present survey and literetures that the forest land of Okinawa is mainly covered by the Red and Yellow soils, in constrast to the mainland of Japan where the Brown Forest soils are the dominant ones. The Red and Yellow soils of Okinawa had a greater value in bulk density, a lower value water percolation and a smaller value in coarse porosity. And the soil profiles belonged to a rather hard class, ranging from hard to extremely hard according to the soil hardness test applied. The soils stuties in this work revealed the general properties of the yellow soils and the lower content of nutrient elements in comparison with the Brown Forest soils. A marked differense between Yona forest soil and Iriomote forest soil was observed on the stracture. This difference was attributed to the defference in the parent materials of those soils.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3928
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.33 p.229 -236
Appears in Collections:No.33 (1986/12)

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