Evidence for trans-cuticular uptake of HNO3 vapor by foliage of Eastern white pine (Pinus strobus L.).
Evidence for trans-cuticular uptake of HNO3 vapor by foliage of Eastern white pine (Pinus strobus L.).
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东部白松 (Pinus strobus L.) 叶子经表皮吸收硝酸蒸气的证据。
DOI：
10.1016/0269-7491(89)90217-0
复制
发表时间：
1989
影响因子：
8.9
通讯作者：
S. Cadle
中科院分区：
文献类型：
--
作者：
J. Marshall;S. Cadle
人们普遍认为，欧洲和美国东北部的森林减少与空气污染物的沉积有关，其中可能包括硝酸蒸气。本实验在室内进行，测量了硝酸在东部白松幼苗叶片上的稳态沉降速率。硝酸浓度在37 - 1260 ppb之间，但大部分在130-180 ppb之间。在130到180 ppb之间，大部分沉积的硝酸可以通过用水冲洗叶片表面来去除。随着暴露时间的增加，洗涤去除的硝酸盐量增加，约8h后达到最大值7.6 nmol cm - 2。8小时后，虽然洗涤液中的硝酸盐浓度保持不变，但硝酸沉积仍以稳态速率继续进行。假设硝酸通过角质层扩散，我们将这种稳态沉积称为“经角质层”。经表皮吸收的阻力（69m2s mol−1）远远超过叶片表面未搅拌层的扩散阻力（5m2s mol−1）。在这些实验中使用的高浓度排除了对环境条件的定量外推；然而，我们已经证明白松角质层既是一个主要的储存池，也是吸收沉积硝酸的主要障碍。
Forest declines in Europe and the northeastern United States are widely believed to be associated with deposition of air pollutants, perhaps including nitric acid vapor. The experiments presented here, which were conducted in indoor chambers, involved measurement of steady-state rates of nitric acid deposition on foliage of seedlings of eastern white pine. Nitric acid concentrations ranged from 37 to 1260 ppb, but were mostly in the 130–180 ppb range. Between 130 and 180 ppb, much of the deposited nitric acid could be removed by washing leaf surfaces with water. Amounts of nitrate removed by washing increased with exposure duration to a maximum of 7·6 nmol cm−2after about 8h. Although nitrate concentrations in the washings remained constant after 8h, nitric acid deposition nonetheless continued at a steady-state rate. We have termed this steady-state deposition ‘trans-cuticular’ on the assumption that the nitric acid diffuses through the cuticle. Resistance to trans-cuticular uptake (69m2s mol−1) far exceeded resistance to diffusion across the unstirred layer at the surface of the leaf (5 m2s mol−1). High concentrations used in these experiments preclude quantitative extrapolation to ambient conditions; however, we have demonstrated that the white pine cuticle is both a major storage pool and a major barrier to uptake of deposited nitric acid.
生态系统中主要离子的大气沉降和冠层相互作用（日文）
DOI：
--
发表时间：
2007
期刊：
Forest Hydrology(Morikita Publishing Co. Ltd., Tokyo)
影响因子：
--
作者：
Chiwa;M
通讯作者：
M