北海道北部におけるカシワ海岸林の動態

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Stand structure, tree growth and mortality in a coastal Kashiwa oak (.Quercus dentata) forest in northern Hokkaido were investigated from 1995 to 2001. The stand structure was strongly affected by sand dune topography, and trees were more dwarfed at higher elevation. The topography also affected the growth of trees and the local tree mortality. Height growth was negatively correlated with relative stem height, calculated as (stem height in 1995)/(height of canopy surface) to evaluate the local stand structure. This result suggests that the height growth of canopy trees was severely restricted by the sea breeze. Relative diameter growth rate of stems was affected not only by initial diameter, but also by projected crown area and relative stem height. The latter two variables would strongly influence the light conditions surrounding the trees. No recruiting by seedlings or root collar sprouting was observed. About 10% of stems died during the study period, and about 37% of the dead stems were severely damaged by Clethrionomys rufocanus bedfordiae. Tree mortality due to other factors was positively correlated with local initial density and relative altitude in the study plot. Thus a higher density and higher position resulted in higher mortality. Relative stem height of the trees that died was less than that of the trees that survived. This result suggests that one-sided competition for light also plays an important role in the stand dynamics of coastal Kashiwa oak forest. The effect of tree position in the study plot might be related to the recovery ability of the damaged crown. This means that trees at a higher position on dunes are unable to recover from severe crown damage.
日本生態学会の論文
2004-04-20

北海道北部におけるカシワ海岸林の動態

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