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一、池杉黄化的情况调查我省丘陵和平原湖区都有池杉的栽植,但都有不同程度的黄化现象。我们于1974年9～10月,先后在宜昌、潜江、洪湖、江陵、东西湖农场进行了池杉黄化情况调查。这些地区的土壤、母质、水分状况不同,池杉黄化程度也不一样。调查结果是:①池杉的黄化程度与土壤的酸碱度有密切关系。凡石灰性土壤PH值为7—8时,苗木都有不同程度的黄化现象,PH下降到5—6时,苗木生长正常,无黄化现象。PH5的一年生苗平均高、根径大于PH8的一倍或更多。②石灰性冲积土地区,在地势低洼,地下水位高或施沟(湖)泥的地方,即使是石灰性冲积土,PH较高,黄化程度很轻或无黄化现象。
First, the investigation of the situation of Ipomoea fusiformis I hilly and plains Lake area has the cultivation of Ipomoea cirsium, but have different degrees of yellowing phenomenon. From September to October 1974, we conducted a survey on the etiolated taxane larvae in succession in Yichang, Qianjiang, Honghu, Jiangling and Dongxihu farms. Soil in these areas, the parent material, the water status is different, the degree of etiolation of Iwatsuya is not the same. The findings are: ① Ipomoea cinnabarinus and soil pH is closely related. Where the calcareous soil PH value of 7-8, seedlings have different degrees of yellowing, PH down to 5-6, seedlings grow normally, no yellowing phenomenon. PH5 annual average high seedlings, roots greater than double the PH8 or more. ② In calcareous alluvial soil areas, in low lying, high groundwater level or ditch (lake) mud, the pH is high and the degree of etiolation is very low or not yellowing even in calcareous alluvial soil.