繁殖期におけるシジュウカラとヤマガラについて

概要

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These studies were carried for the purposes of investigating the injured leaves of Pharbitis Nil CHOISY and abnormal defoliations on several species in the National Park for Nature Study, with the following results : (A) Investigation about injured leaves of Pharbitis Nil CHOISY. 1. The distribution of injured leaves showed a tendency that the more leaves investigated had been placed near the circumference of this park, the more injuries became heavy. 2. From map of distribution of injured leaves, it was concluded that air pollutants had inflowed from a southern street of this park and had been standing still in the park. 3. The injury of leaves would stand in some relation to traffic situations of circumference (such as the heavy traffic volume and stagnation of street). (B) Investigation about abnormal defoliations. L. Abnormal defoliations of trees of many. Species were observed all over the park. The firabnormal defoliations of trees investigated were observed on the 8th of July. 2. A graph of the volume of fallen leaves per day had two peaks between July and August, and the defoliations showed a tendensy to increase after 4 or 5 days when a continuous warning of photochemical smog had announced officially. 3. It was observed that new leaves of Zelkova serrata MAKlNO, Quercus serrata THUNB., Juglans mandshurica MAXIM. Var. Sieboldiana MAKlNO and Ligustrum lucidum AIT. Developed about 22th of August.
1974-06-25