中文摘要：

2009年3月至2010年4月,采用样方法和直接观察法对商丘市区喜鹊的巢址选择进行了研究,共调查了26个巢址样方和12个对照样方的巢树参数和环境参数.结果表明,喜鹊巢址主要选择在路边高大的毛白杨树上,巢一般位于树冠的中上层,距地面高度10~20 m,偏爱选择在分枝数为3的地方筑巢,对巢下郁闭度也有很明显的选择性;在人流量大的地方或路边有巢位升高的趋势,以避免地面交通噪声和人类活动的影响,说明城市喜鹊的繁殖行为发生了适应性变化.主成分分析表明,影响喜鹊巢址选择的主要因子依次为筑巢树高、筑巢树种、样方内巢数、样方树量、巢区位置.其巢址选择其实是喜鹊对城市环境适应的一种结果,也是对各种生态因子进行权衡的结果.研究还发现,喜鹊有类似于猛禽的＂吐丸＂现象,这在以往的研究中还未见报道,其原因可能是喜鹊在繁殖后期对白杨树枝中某种营养成分的需求,还有待于进一步的研究.

英文摘要：

Using quadrat method and direct observation,the nest-site selection of Pica pica was investigated from march 2009 to April 2010 in Shangqiu city,Henan Province.Nest tree characteristics and habitat characteristics were respectively measured at each of twenty-six nest and 12 non-nest samples in the fieldwork.The results showed that Pica pica selected larger Populus tomentosa Carr near the road for habitat as nest sites.The height of nests was 10-20m in mid and upper canopy of tree.Pica pica significantly prefered to build their nests at three nest branches and had the selection to the canopy density below nest.Nest was transferred to higher site（larger tree and building） when it was near the large populatlion flow,which could reduced the effect of traffic noise and human activity.This suggests that there is a change in reproductive activity of Pica pica to adapted the city enviroments.The principal components analysis indicated that the importance of environmental factors was in the following order： the height of nest tree,the species of trees,the number of nest within the sample,the number of trees within plots,nest area location.The study on Pica pica in shangqiu city indicacted that nest-slection is a result of adaptation to city environments and a tradeoff among ecological factors.In addition,there was a phenomenon of pellets in Pica pica from May to June,which is similar to raptor.This phenomenon was not seen in the past research.The reason is probably that the Pica pica requires for a component of poplar branches in breeding late.Further explanation need to be studied.