Changes in conifer and deciduous forest foliar and forest floor chemistry and basal area tree growth across a nitrogen (N) deposition gradient in the northeastern US.
Changes in conifer and deciduous forest foliar and forest floor chemistry and basal area tree growth across a nitrogen (N) deposition gradient in the northeastern US.
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美国东北部氮 (N) 沉积梯度中针叶树和落叶林叶面和森林地面化学成分以及树木断面面积生长的变化。
DOI：
10.1016/j.envpol.2007.05.013
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发表时间：
2007
影响因子：
8.9
通讯作者：
L. Pardo
中科院分区：
文献类型：
--
作者：
J. Boggs;S. McNulty;L. Pardo
我们在东北部的11个红云杉（云杉Sarg。）在1987/1988年和1999年在6对云杉和落叶站点的叶和森林地面化学和断面积增长。这六块红云杉地块是1987/1988年原始云杉地块的一个子集。在1999年，我们观察到一个显着的相关性平均生长季节温度和红云杉断面积增长。红云杉和落叶叶%N与N沉降呈显著相关。虽然氮沉降没有显着变化，从1987/1988年至1999年，净硝化潜力显着下降，在白面。这种净潜在硝化作用的减少与氮饱和假说不一致，并表明非氮沉积控制，如气候因素和固定下来的枯木，可能有有限的N循环。
We evaluated foliar and forest floor chemistry across a gradient of N deposition in the Northeast at 11 red spruce (Picea rubens Sarg.) sites in 1987/1988 and foliar and forest floor chemistry and basal area growth at six paired spruce and deciduous sites in 1999. The six red spruce plots were a subset of the original 1987/1988 spruce sites. In 1999, we observed a significant correlation between mean growing season temperature and red spruce basal area growth. Red spruce and deciduous foliar %N correlated significantly with N deposition. Although N deposition has not changed significantly from 1987/1988 to 1999, net nitrification potential decreased significantly at Whiteface. This decrease in net potential nitrification is not consistent with the N saturation hypothesis and suggests that non-N deposition controls, such as climatic factors and immobilization of down dead wood, might have limited N cycling.