Stomatal length correlates with elevation of growth in four temperate species.
Stomatal length correlates with elevation of growth in four temperate species.
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DOI：
10.1080/10549810802626142
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发表时间：
2009-01-01
影响因子：
1.6
通讯作者：
Richardson, A. D.
中科院分区：
文献类型：
--
作者：
Holland, N.;Richardson, A. D.
气孔大小和密度被认为是两个关键的生态生理参数，因为它们共同影响气孔导度。在目前的研究中，我们研究了这些解剖特征在沿海拔660米的山坡上的趋势。Moosilauke，位于新罕布夏州的怀特山脉。样本采集自两个阔叶树种(Betula Papayrifera var.)和两种草本林下植物(加拿大山茱萸和鳞毛蕨属)。保卫细胞长度随海拔升高而增加(均p≤.10)，但气孔密度无明显上升趋势(均p≥.10)。潜在电导指数[=(保卫细胞长度)2*气孔密度*10-4]与海拔高度呈正相关，但这一趋势仅对两种林下植物显著(均为p≤.10)。结果在解释气孔特征随海拔变化的主流理论的背景下进行了讨论。
Stomatal size and density are considered two key ecophysiological parameters, because they jointly influence stomatal conductance. In the present study, we examine trends in these anatomical traits along a 660-m elevational gradient on Mt. Moosilauke, in the White Mountains of New Hampshire. Samples were collected from two broadleaf tree species (Betula papayrifera var. cordifolia and Sorbus americana) and two herbaceous understory species (Cornus canadensis and Dryopteris carthusiana). Guard cell length increased with elevation in all four species (all p≤.10), but there were no clear elevational trends in stomatal density in any of the four species (all p≥.10). A "potential conductance index" [=(guard cell length)2 * stomatal density * 10-4] was positively correlated with elevation for all species, but this trend was significant only for the two understory species (both p≤.10). Results are discussed in the context of prevailing theories to explain changes in stomatal traits with elevation.