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J. Jpn. Soc. Soil Phys.
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*ῌ*ῌ*ῌ**ῌ*Comparison of Evapotranspiration between Indigenous Vegetation
and Invading Vegetation in a Bog
Toshiki FUJIMOTO*, Ippei IIYAMA*, Mai SAKAI*, Osamu NAGATA** and Shuichi HASEGAWA** The Graduate School of Agriculture, Hokkaido University, Sapporo *0*ῌ2/23, Japan** National Agricultural Research Center for Hokkaido Region, Sapporo *0,ῌ2///, Japan
Abstract
To assess the e#ect of vegetation change on water balance in terms of wetland ecosystemconservation, we evaluated the evapotranspiration, the largest output from the Bibai mire, withthe lysimeter method in a bamboo grass-invading area and in a Sphagnum bog. Cumulative
evapotranspiration in ,**. and ,**/ except for snow season was greater in the Sphagnum bog thanin the bamboo grass-invading area. Therefore, we should deny a hypothesis such that because thebamboo grasses had higher ability of evapotranspiration than the indigenous plants, groundwater table lowering would take place when the bamboo grasses invaded into the Sphagnum bog,
resulting in the expansion of the bamboo grass-invading area even more into the indigenous
vegetation area. Based on the measured evapotranspiration rates under several groundwatertable levels in the lysimeter method, we concluded that the Sphagnum growth would not be
disturbed even if groundwater table level dropped down to ,* cm while the evapotranspiration
rate in the bamboo grass area would be a#ected signiﬁcantly with groundwater table levelchanging. And from comparison of the data from the lysimeter method with those from the othertwo methods, it was suggested that the lysimeter method can evaluate the evapotranspiration
rate in a ﬁeld scale as precisely as the Bowen ration method or the Penman method.
Key words : evapotranspiration, lysimeter method, water table, bamboo grass-invading area,
Sphagnum bog

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