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该文通过对榆树、枣树、刺槐和珠美海棠４个树种在年生长季内土壤养分释放以及根、枝、叶等器官营养元素含量变化的研究，得出如下结论：①土壤Ｎａ＋含量在一年中的变化主要受气候条件的影响。如果以全Ｎ和全Ｐ含量来衡量的话，土壤呈极贫脊状态。②Ｎａ＋在林木根中的含量，主要与树木生理活动强度有关，枝组织Ｎａ＋含量的最高点在春季，叶组织Ｎａ＋含量的最高点在晚秋。③除刺槐外，榆树、枣树、海棠都表现出不同程度的营养失调和缺素症。
In this paper, we studied the changes of soil nutrient contents, the contents of nutrients in roots, branches and leaves of four tree species, Elm, Jujube, Robinia pseudoacacia and Begonia, during the growing season. The conclusions are as follows: ①The content of Na + Changes in the year are mainly affected by climatic conditions. The soil is extremely ridgeside if measured in terms of total N and total P. The content of Na + in tree roots was mainly related to the intensity of tree physiological activities. The highest point of Na + content in branch tissues was in spring and the highest point of Na + in leaf tissues was in late autumn. ③ In addition to acacia, elm, jujube, Begonia have shown varying degrees of malnutrition and deficiency.