Development of stand density control diagram for water resources conservation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26292088
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Forest science
• Research Institution: Prefectural University of Kumamoto
• Principal Investigator: Inoue Akio 熊本県立大学, 環境共生学部, 教授 (80304202)
• Co-Investigator(Kenkyū-buntansha): 高木 正博 宮崎大学, 農学部, 教授 (70315357) ; 大槻 恭一 九州大学, (連合)農学研究科(研究院), 教授 (80183763)
• Research Collaborator: SANKODA Kenshi ; TSURUDA Junko ; NAGANO Miho
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 水資源 / 蒸発散 / 蒸散 / 遮断蒸発 / 人工林 / 密度管理図 / 辺材

Outline of Final Research Achievements

The stand density control diagram for water resources was developed, which enabled us to predict the evapotransipiration from stand density and mean diameter at breast height.
To develop the diagram, we assumed that (1) the evapotranspiration was composed of the evaporation and the rainfall interception; (2) the evaporation could be estimated from mean sap flux density, stand density and mean diameter at breast height; and (3) the rainfall interception could be predicted using an exponential equation from mean diameter at breast height and annual rainfall.
The horizontal and vertical axis of the diagram developed here showed the stand density and the evapotranspiration, respectively. The diagram also composed of (1) the equivalent diameter curve that shows the relationship between stand density and evapotranspiration of the stand with a given mean diameter and (2) the self-thinning boundary line that indicates the maximum stand density-evepotranspiration relationship.

Free Research Field

森林計画学