浙江省鹭类营巢地调查

１９８３年至１９９９年对浙江省鹭类营巢地进行了调查。发现鹭类营巢地２２处，其中浙江北部地区有１５处，占６８．１８％，浙江中部地区６处，占２７．２７％，海岛１处，占４．５５％。现存营巢地１２处，其中浙江北部地区８处，占６６．６７％，浙江中部地区３处，占２５．０％，舟山海岛１处，占８．３３％；废弃营巢地１０处。鹭类营巢地居住年限在１－１６ａ，居住５ａ以下的占７２．７２％，６ａ以上较少。鹭类营巢地废弃的

A survey on the heronries in Zhejiang Province

Twenty two heronries were found in Zhejiang Province from 1983 to 1999.Among them,15 heronries were in northern Zhejiang,6 heronries in the middle of Zhejiang,and 1 heronry in an island.There are only 12 heronries in existence,which are located in different parts of Zhejiang Province(8 heronries in northern Zhejiang,3 in the middle and 1 in Zhoushan Islands).The inhabited life of heronries varies from 1 to 16 years,and 72 72% of them is less than 5 years.Destruction of habitants,human disturbance and environment pollution are main factors of unsteady heronries.Heron activities bring about some effects on the growth of trees.