2001 Fiscal Year Final Research Report Summary
Evaluation of forest clear cutting effects on hydrological cycle and material cycle in a watershed
| Project/Area Number |
11460063
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUZUKI Masakazu Graduate school of Agricultural and life Sciences, The University of Tokyo, Professor, 大学院・農学生命科学研究科, 教授 (10144346)
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| Co-Investigator(Kenkyū-buntansha) |
SYUIN Yasuhiro Graduate school of Agricultural and life Sciences, The University of Tokyo, Lecturer, 大学院・農学生命科学研究科, 講師 (60221305)
SHIBANO Hirofumi Graduate school of Agricultural and life Sciences, The University of Tokyo, Associate Professor, 大学院・農学生命科学研究科, 助教授 (00143412)
OHTA Takehiko Graduate school of Agricultural and life Sciences, The University of Tokyo, Professor, 大学院・農学生命科学研究科, 教授 (50134797)
KURAJI Koichiro Graduate school of Agricultural and life Sciences, The University of Tokyo, Lecturer, 大学院・農学生命科学研究科, 講師 (90282566)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Paired Watershed Method / Clear cutting / Water budget / Material Cycling / Water quality generation / SiO_2 |
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| Research Abstract |
A paired watershed method experiment has been conducted in Fukuroyama Experimental Watershed in University Forest in Chiba, the University of Tokyo. Watershed A and B are both approximately 1ha in catchment area and have been covered a 70-years-old mixed stand of Cryptomeria japonica and Chamaecyparis obtuse stand. All trees in the watershed B were cut and yarded by cable system from February to April in 1999. Effects of clear-cut on environmental factors detected within three years by this experiment are as follows:
1) Increase in discharge water in watershed B is 250-300 mm/yr which caused by decreasing in evapotranspiration after cutting.
2) Increase in concentration of nitrate nitrogen in stream water is detected from several months after cutting. Concentration in nitrate nitrogen is still higher than the control watershed.
3)Sediment discharge from clear-cut watershed shows no remarkable change compared with the control watershed.
4)Soil moisture in lower slope in clear-cut watershed is in wetter condition, however relatively dry in shallow layer in ridge.
5)Soil temperature in clear-cut watershed is increased by incoming solar radiation after cutting.
6)Soil respiration in clear-cut watershed is apparently increased, however the extent of changes can be explained by increase in soil temperature increase.
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