森林立地学会誌 森林立地45(1),2003,29〜33
Jpn.J.For.Environment
45(1),29-33 2003
Interspecific comparison of
leaf area loss caused by insect herbivores
in relation to leaf
properties in a cool temperate deciduous broad-leaved forest
Ryunosuke Tateno＊Sachie Morizumi＊＊and Hiroshi Takeda＊
＊Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
＊＊Forestry Agency
Leaf area losses caused by folivorous insects were studied for the 13 dominant tree species growing in a wide range of soil habitat conditions (from mesic to xeric) in a natural cool temperate forest in Japan. We investigated the relationship between leaf properties and leaf area loss. The mean leaf area loss of the 13 tree species ranged from 1.9 to 6.8% with a mean of 3.9%. Mesic species had higher leaf nitrogen (N) concentrations than xeric species; however, total phenolics and specific leaf area were not correlated with soil habitat conditions. Of the leaf properties studied, only leaf N concentration was positively correlated with leaf area loss. Our results agree with previous studies, and suggest that species adapted to nuturient-rich environments are more susceptible to folivorous insects than those adapted to nutrient-poor environments.
館野隆之輔・両角早千恵・武田博清：冷温帯落葉広葉樹林における主要樹種の被食葉面積と葉の特性
冷温帯落葉広葉樹林において，湿生から乾生までさまざまな立地に生育する主要樹種13種について被食葉面積を明らかにした。13樹種の被食葉面積の平均値は3.9%，最小値および最大値はそれぞれ1.9%と6.8%であった。湿生樹種の葉の窒素濃度は、乾生種より高い傾向が見られたが，葉の総フェノール量や比葉面積（SLA）は，生育する土壌条件との関係は見られなかった。葉の性質の中で，窒素濃度のみが，被食葉面積と有意な正の相関関係が見られた。本研究の結果は既存の研究とも一致し，冨栄養な環境に適応した種は，貧栄養な環境に適応した種よりも，葉食性昆虫による摂食を受けやすいことが示唆された。