短耳鸮种群数量调查

笔者在山西省关帝山国有林管理局二道川林场选取典型样带,通过实地调查的方法对夜行性鸟类短耳鸮的迁徙特性和种群数量进行了调查.结果表明：短耳鸮在山西省为冬候鸟,其北徙时持续时间短（32 d～43 d）,间隔期长（156 d～162 d）,种群数量为0.073只/km.南徒时持续时间长（56 d～71 d）,间隔期短（100 d～112 d）,种群数量为0.094只/km.其食物组成为鼠类、鸟类和昆虫类,是农林益鸟,应加以保护.

Population Quantity Survey of Asio flammeus

The author chose typical belt transects in Erdaochuan forest farm in national forestry administration bureau of Guandi mountain and migration characteristics and population of the Asio flammeus nocturnal bird were investigated by means of field survey. The results showed that the Asio flammeus was winter bird in Shanxi province, the north migration duration was short （32 d -43 d）, interval was long （ 156 d - 162 d）, population was O. 073/km. The south migration duration was long （56 d-71 d）, and interval was short （100 d - 112 d）, population was O. 094/km. The food composition was rodents, birds, and insects. It was a useful bird to agriculture and forestry, and should be protected.