The effect of site quality on growth efficiency of upper crown class Picea rubens and Abies balsamea in Maine, USA.
The effect of site quality on growth efficiency of upper crown class Picea rubens and Abies balsamea in Maine, USA.
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美国缅因州立地质量对上冠类云杉和冷杉生长效率的影响。
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
R. Seymour
中科院分区：
文献类型：
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作者：
R. DeRose;R. Seymour
研究了411株优势种和共优势种冷杉（Abies balsamea（L.）Mill.和云杉（Picea rubens Sarg.）来自美国缅因州的10个研究中心。杨A. Balsamea（n = 204）来自15-20年前进行商业性间伐的林分，地位指数范围为18.4 - 24.3，而较老的P. rubens（n = 207）来自未进行商业性间伐的林分，地位指数范围为13.1 - 17.8。我们假设，网站索引积极影响增长效率。结果表明，随着立地指数的增加，刺槐林分的生长量-叶面积关系和生长效率显著提高。但不受地位指数的影响。随着叶面积的增加，两种植物的生长效率均呈单调递减的趋势。当标准化单位立地指数，生长效率表现为非线性的两个物种。
The influence of site index on growth efficiency was studied for 411 dominant and codominant Abies balsamea (L.) Mill. and Picea rubens Sarg. from 10 sites across Maine, USA. Young A. balsamea (n = 204) were from stands precommercially thinned 15–20 years ago and ranged in site index from 18.4 to 24.3, while the older P. rubens (n = 207) were from stands that were not precommercially thinned and ranged in site index from 13.1 to 17.8. We hypothesized that site index positively influences growth efficiency. The results showed that volume increment – leaf area relationships and growth efficiency increased significantly with site index for A. balsamea but were unaffected by site index for P. rubens. A monotonic decreasing pattern of growth efficiency over increasing leaf area was found for both species. When standardized per unit site index, growth efficiency behaved nonlinearly for both species.