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No.40 (1993/12) >

 
Title :森林伐採が降雨流出に及ぼす影響について(生産環境学科)
Title alternative :Effect for surface runoff in small basin due to deforestation (Department of Enviromental Sciences and Technology)
Authors :吉永, 安俊
翁長, 謙良
Authors alternative :Yoshinaga, Anshun
Onaga, Kenryo
Issue Date :1-Dec-1993
Abstract :森林伐採(皆伐)が雨水の短期流出に及ぼす影響は三つに大別される。第一は樹冠遮断量の消滅による地上到達雨量の増加である。第二はA。層の侵食流亡量の増加及び地中侵入量の減少である。第三は雨水の流出時間の短縮である。森林伐採に伴う土壌表層の温度及び水分変動の拡大は,A。層有機質の分解と流亡を促進し,第二,第三の現象を増幅させる結果をもたらす。森林伐採によって洪水流量が増加し,到達時間は短くなる。
Runoff characteristic was compared between forest and deforestation experimental basins. Two experimental basins, forest and defoerstation was set in order to investgate the deference of runoff discharge between the two basins. Rainfall and runoff discharge were obserbed and made runoff analysis. In order to estimate the the organic mater content of surface soil, soil temperature was obserbed. The result obtained form the investigation were as follows : 1) Runoff discharge from the forest basin was lesser than that of the deforestation, and time of flood concentration of the forest basin was longere than from the deforestation one. The means the surface runoff in the forest is smaller than in the deforestation and flow slowly. 2) concerning soil temperature, compared with two basins, the deforestation basin was higher temperature rising rate than that of the forest one and cleared that the temperature difference between day time and night time, was lagere in the deforestation than in the forest. This means decomposition of organic mater is more hasten in the defoerstation. Runoff analysis and observation of soil temperature revealed that deforeststion result to promote surface runoff.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3792
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.40 p.69 -75
Appears in Collections:No.40 (1993/12)

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