Journal
HYDROLOGICAL RESEARCH LETTERS
Volume 13, Issue 3, Pages 49-54Publisher
JSHWR, JAGH, JAHS, JSPH
DOI: 10.3178/hrl.13.49
Keywords
forest management; hydrology; cypress; thinning; forestry; runoff
Categories
Funding
- Japan Science and Technology Agency under the category Innovative Technology and System for Sustainable Water Use
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Changes in runoff caused by forest management practices such as thinning need to be better understood for effective water resource management. We established matched (20 degrees slope) 62%-thinning treatment and grassland control lysimeter plots in a 22-year-old cypress plantation in the Inuyama Research Forest of the Ecohydrology Research Institute, Japan. Runoff (surface and subsurface) was directed into a collection tank with a 90 degrees v-notch weir outlet. Measurements were made before and after the thinning treatment and were compared with grassland control. Monthly manual measurements of subsurface runoff (March 2011-December 2014) performed via a measuring cylinder and stopwatch yielded 18 pre-thinning and 24 post-thinning observations. In addition, 26 pre-thinning and 24 post-thinning sets of storm-event measurements were continuously recorded via a water level data logger. Following thinning, subsurface runoff and peak storm-runoff changed by up to +133% and -80% respectively. By controlling the geology, soil characteristics and hydrological pathways, we were able to attribute these outcomes to reduced transpiration and increased ground resistance from felled logs respectively, suggesting that well-managed high-intensity thinning may be beneficial for increasing water supply and controlling floods. However, this is only achievable if felled logs are aligned along contour lines on the hillslopes.
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