Oxygen Supply of Roots by Gas Transport in Alder-Trees
Oxygen Supply of Roots by Gas Transport in Alder-Trees
复制标题
桤木树根部气体输送供氧
DOI：
10.1515/znc-1984-11-1234
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
P. Schröder
中科院分区：
文献类型：
--
作者：
W. Grosse;P. Schröder
一般认为，氧气是根据分压梯度从植物表面通过细胞间隙向异养组织扩散的。目前的实验表明，由于在有叶和无叶桤木（L.）树木中的气体输送，额外的多种更高的氧气供应（L.）。加特纳。这种气体从茎向根输送。它是由树干的空气空间系统内的热渗透增压驱动的，这是由于树干和周围空气之间的温度梯度高达3.6 K，随后树皮的褐色色素吸收了光能。这种气相现象似乎使桤木树能够在高地下水位或浸水土壤造成的潮湿土壤中生存和生长。
Abstract It is generally accepted that oxygen diffuses according to the gradient of its partial pressure from the surface of the plants into the heterotrophic tissues through the intercellular spaces. The present experiments show evidence of an additional manifold higher oxygen supply due to a gas transport in leaved as well as leafless trees of Alnus glutinosa (L.) Gaertner. This gas transport is directed from the stems to the roots. It is driven by a thermo-osmotic pressurisation within the air space system of the stems, resulting from temperature gradients up to 3.6 K between the stem and the ambient air following the absorption of light energy by the brownish pigments of the bark. This gas phase phenomena appears to enable the alder-trees to survive and grow in wet soil resulting from a high water table or in waterlogged soil.