Botkin D B, Jordan P A, Dominski A S, Lowendorf H S, Hutchinson G E
School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut 06520.
Proc Natl Acad Sci U S A. 1973 Oct;70(10):2745-8. doi: 10.1073/pnas.70.10.2745.
Analyses of terrestrial sources of sodium and estimates of the sodium requirement of moose (Alces alces) on Isle Royale, Lake Superior, suggest that availability of the element controls the moose population. The terrestrial vegetation is very poor in the element, but, as elsewhere, submerged and floating leaved water-plants are relatively rich. Consumption of such plants in summer would provide an adequate source, if the animal can store the element. The fairly high sodium contents of freshwater vegetation have been little appreciated. In general, sodium concentration in water-plants, unlike that of potassium, is not correlated with chloride but the latter is ordinarily in excess of the sodium, so that uptake of the latter implies an equivalent supply of NaCl.
对苏必利尔湖罗亚尔岛上驼鹿（驼鹿属）钠的陆地来源分析以及钠需求量估计表明，该元素的可利用性控制着驼鹿种群数量。陆地植被中该元素含量极低，但与其他地方一样，沉水和浮叶水生植物相对富含钠。如果动物能够储存该元素，夏季食用此类植物将提供充足的来源。淡水植被中相当高的钠含量一直未得到充分认识。一般来说，水生植物中的钠浓度与钾不同，与氯不相关，但氯通常过量，因此钠的吸收意味着等量的氯化钠供应。
