拉市海湿地冬季水禽种群数量变化分析

从2002年3月到2004年2月，对拉市海对水禽进行调查，记录到74种水禽，其中6种为留鸟，43种为冬候鸟，2种为夏候鸟，23种为过境乌。过境鸟主要出现在10月、11月和次年的3月、4月。水禽的数量季节性分布是呈双峰状的，通过对22个普通常见种的分析，水禽在越冬期内的数量变化有3种类型：双峰型、单峰型、无序波动型。5普通种类在整个冬季是变化的，它们的数量变化在相邻的几个周内超过40％。

Analysis on the Variation in Quantity of Waterbird Population in Winter in Lashihai Wetland

The inventory of waterfowl in Lashihai Lake had been conducted during March 2002 to February 2004. As a result, 74 species were recorded, including 6 residents, 43 winter birds, 2 summer birds, and 23 transit birds, which mainly appeared in October , November, and March & April in next year. The seasonal distribution of the waterfowl quantity presented double-humped state. In details, by means of the analysis of 22 common waterbird species, there were 3 variation patterns namely double-humped, single-humped, irregular in the period of winter. Five common species varied in quantity during the whole winter, and the extent of vairation exceeded 40% within several contiguous weeks.