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池杉(Taxodium ascendens Brongn),原产北美沼泽地带,1917年引入南京.它干形通直,树冠小,材质较好,病虫害少,树姿美观,为我省正在积极推广的速生用材树种之一.但不耐盘碱,弱碱性土壤易发生黄化.发生黄化的池杉,轻则影响生长,重则枯萎死亡.据调查,我省除镇、扬、徐海丘陵山区以及里下河、苏南乎原圩区、湖塘滩地等地区未见或少见发生外,其余均有不同程度发生,尤以沿江高沙地区、沿海和徐淮地区严重,因而对其繁殖推广带来一定的影响.为此从1979年起,我们进行了一些试验研究,现将结果整理如下:
Taxodium ascendens Brongn, originating in the North American marsh area, was introduced to Nanjing in 1917. It is dry and straight, with small canopy, good material, less pests and diseases and beautiful tree appearance. It is a species of fast growing timber species actively promoted in our province 1. But not resistant to alkali, weak alkaline soil prone to yellow. Yellowing of the Iii fir, ranging from the impact of growth, but wither dead weight.According to the survey, I save the town, Yang, Xu Hilly and l The lower river, the southern Jiangsu plain and polders, Hutang beach and other areas have not seen or seen rare, the rest have varying degrees of occurrence, especially in the high sand along the Yangtze River, coastal and Xuhuai area, so its breeding and promotion brought A certain impact.To this end since 1979, we conducted some experimental research, the results are summarized as follows: