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Study on seasonal change of insolation in the forest stand

Research Project

Project/Area Number 04660159
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionNiigata University

Principal Investigator

TAKEUCHI Kimio  Niigata University, Faculty of Agriculture Professor, 農学部, 教授 (60012085)

Co-Investigator(Kenkyū-buntansha) TANAKA Kazuhiro  Mie University, Faculty of Bioresources Associate Professor, 生物資源学部, 助教授 (70155117)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1992: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsBare land insolation / Forest stand insolation / PAR / Luminous intensity / Seasonal change / 固定プロット / 光量子センサー
Research Abstract

1. By corresponding the insolation on the open building-top to the time progress of calculated solar altitude, the amount of insolation on the earth in fine weather was estimated. Although observing value includes atmospheric change, it is concluded that insolation can be estimated sufficiently on bare land in the fine weather daytime.
2. Changes of insolation in various forest stands were measured. The monthly measurement in a fine weather was so difficult that measurements were not done many times in each forest stand. On earh forest stand, 20m x 20m square plot was set, and then the insolation was measured at 1.5 meters upper site of square points at the intervals of 5 meters. PAR(photosynthetically active radiation) and luminous intensity were measured using the LI-COR LI-1000 Data Logger with a PAR sensor and a luminous sensor.
3. Based on the above-mentioned idea and method, seasonal change of insolation in the forest was estimated. Consequently, the calculated parameters have made the good estimations of insolation on bare land around the forest stand possible. Concerniing the point, this research will give a new view to usual method of measuring insolation. However, because of large variation of insolation in each point, seasonal changes could not be discussed sufficiently. In addition to improving the method, further measurements are planned for accumulating data as the development of this research.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report

URL: 

Published: 1992-04-01   Modified: 2016-04-21  

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