沼泽山雀春冬季节取食生态位的比较

对沼泽山雀在落叶阔叶林中春冬季节的取食生态位作了观察和研究，从观察的结果得知，该种山雀两种季节的取食生态位有所不同。一般来讲，冬季的取食生态全宽度较春季的大，该鸟两种季节在取食树种一维生态位重叠最小，在树冠水平位生态位重叠最大，该鸟冬季主要取食树种是黑桦，春季为白皮柳，其次是黑桦。

The Comparative Foraging Niche of the Marsh Tit in Winter-Spring Season

The comparative investigation and observation of foraging niche of the marsh tit was carried out ihdeciduous-broad forestry from winter to spring season,The result has been obtained that this kind of tit wasdifferent in foraging niches breadth and niche overlap in two seasons. Foragihg niche in winter was generallybroader than that in spring,The niche overlap of the tit in two seasons was caculated besides the nichebreadth,and the result is that the niche overlap of foraging tree species was the smallest one(0.279)in the twoseasons. The one of the horizontal crown position is the biggest(0.854).The main foraging tree species inwinter was Betula dahurica but in spring was salixpievotii and then Betula dahurica.