Decline of red spruce in the Adirondacks, New York
Decline of red spruce in the Adirondacks, New York
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纽约州阿迪朗达克山脉红云杉的衰落
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
A. R. Breisch
中科院分区：
文献类型：
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作者：
Jon Scott;T. Siccama;A. Johnson;A. R. Breisch
阿迪朗达克山脉怀特菲斯山云杉冷杉林中的 32 个林分最初于 1964-66 年采样，于 1982 年进行了重新调查。1982 年，每个林分使用了 10-25 个 Bitterlich 点，以获得每公顷断面积的估计值。数据是针对低海拔（或 = 900m）森林进行总结的。红云杉低海拔森林断面积减少40-60%，900m以上森林断面积减少60-70%。由于一些林分的自然干扰，香脂冷杉在高海拔地区减少了 35%，但仅考虑未受干扰的林分时则没有变化。红云杉的减少约占高海拔和低海拔森林断面积减少总量的四分之三。高海拔样本的云杉出苗频率下降了80%，但在900m以下没有变化。阿迪朗达克山脉云杉衰退的模式与新英格兰的调查结果相似。下降的原因当时还存在推测。
Thirty-two stands in the spruce-fir forests of Whiteface Mountain in the Adirondacks, originally sampled from 1964-66, were resurveyed in 1982. From 10-25 Bitterlich points were used in each stand in 1982 to obtain an estimate of basal area per hectare. Data were summarized for low elevation ( or = 900m) forests. Red spruce declined by 40-60% in basal area for the low elevation forests and by 60-70% above 900m. Balsam fir decreased by 35% at high elevations, due to natural disturbance in several of the stands, but was unchanged when only undisturbed stands were considered. The decline of red spruce accounted for about three quarters of the total decrease in basal area for both the high- and low-elevation forests. Spruce seedling frequency for the high-elevation sample decreased by 80%, but was unchanged below 900m. The pattern of spruce decline in the Adirondacks is similar to findings for New England. The cause of the decline is speculative at the time.