CROWN DETERIORATION AND REDUCED GROWTH ASSOCIATED WITH EXCESSIVE SEED PRODUCTION BY BIRCH
CROWN DETERIORATION AND REDUCED GROWTH ASSOCIATED WITH EXCESSIVE SEED PRODUCTION BY BIRCH
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DOI：
10.1139/b72-312
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发表时间：
1972-01-01
期刊：
影响因子：
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通讯作者：
GROSS, HL
中科院分区：
文献类型：
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作者：
GROSS, HL
在1967年，和白色桦树，B。papyriferaMarsh.，在安大略发展了大量的种子作物。树冠种子较多的部分叶片矮化或缺失。芽没有发展的终端部分的大多数分支，并在1968年分支死亡回到点芽可供生长。1967年，这两个物种的终端生长和直径生长都有所减少，1968年，黄桦的终端生长继续以降低的速度增长。顶芽生长量和芽产量与结果量呈负相关。1970年一些黄桦也出现了类似的情况。黄桦受害更严重，大多数成熟林分的枯梢平均为20 - 50 cm。 白色桦树没有受到这种程度的影响，但是，在大多数成熟的立场，一些树木遭受广泛的枯死。
In 1967 yellow birch,Betula alleghaniensisBritt., and white birch,B. papyriferaMarsh., developed extremely large seed crops in Ontario. Foliage was dwarfed or missing in the heavily seeded portions of tree crowns. Buds did not develop on the terminal portions of most branches, and in 1968 branches died back to the point where buds were available for growth. Terminal growth and diameter growth were reduced for both species in 1967, and terminal growth by yellow birch continued at a reduced rate in 1968. Terminal growth and bud production were inversely related to the amount of fruiting. Similar conditions prevailed on some yellow birch in 1970.Yellow birch was more seriously affected, and in most mature stands dieback averaged 20 to 50 cm. White birch was not affected to this extent; however, some trees in most mature stands suffered extensive dieback.