Northern White-Cedar Regeneration Dynamics on the Penobscot Experimental Forest in Maine: 40-Year Results
Northern White-Cedar Regeneration Dynamics on the Penobscot Experimental Forest in Maine: 40-Year Results
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DOI：
10.1093/njaf/27.1.5
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发表时间：
2010-03-01
影响因子：
--
通讯作者：
Ruel, Jean-Claude
中科院分区：
文献类型：
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作者：
Larouche, Catherine;Kenefic, Laura S.;Ruel, Jean-Claude
本研究的目的是评估缅因州佩诺布斯科特试验林北方白杉（Thuja occidentalis L.）幼苗和幼树的生长和死亡的长期动态。对1965年至2005年间收集的4次重复部分切削处理的数据进行了分析。尽管白尾鹿（Odocoileus virginianus Zimmerman）的种群密度相对较高，但在所有处理下，白雪松幼苗均能建立。然而，尽管相关软木的再生队列似乎随着时间的推移而增加，但白雪松队列却没有。白杉幼苗至幼树期的长势低于幼树死亡率和极期补血率的总和；2005年该树种的树苗密度比测量期开始时减少了约80%。幼树死亡率高，向大苗龄级的吸收率低，但随着幼树幼龄的增加，死亡率降低，吸收率增加。浏览是多产的；2005年，90%的白杉树苗和小树苗出现了斑疹。总体而言，白雪松树苗生长缓慢，在研究林分中，从小树苗到可销售的树苗，估计需要100年的时间。建议通过商业前处理和控制浏览压力来释放白杉树苗。
The objective of this study was to assess the long-term dynamics of northern white-cedar (Thuja occidentalis L.) seedling and sapling growth and mortality on the Penobscot Experimental Forest in Maine. Data collected between 1965 and 2005 in four twice-replicated partial cutting treatments were analyzed. White-cedar seedlings established in all treatments despite relatively high white tailed-deer (Odocoileus virginianus Zimmerman) population densities. However, although it appears that regeneration cohorts of associated softwoods increased in size over time, the white-cedar cohort did not. Ingrowth of white-cedar from the seedling to sapling stage was lower than the combined rates of sapling mortality and recruitment to the pole stage; sapling density of this species in 2005 was >80% less than it was at the start of the measurement period. Sapling mortality was high, and recruitment to larger size classes was low, although mortality decreased and recruitment increased as sapling size increased. Browsing was prolific; 90% of white-cedar seedlings and small saplings showed signs of browse in 2005. Overall, white-cedar sapling growth was slow, with an estimated 100 years needed to grow from small sapling to merchantable size in the study stands. Efforts to release white-cedar saplings through precommercial treatment and control of browsing pressure are recommended.