鹭类集群繁殖对营巢地土壤氮、磷、钾含量的影响

The Impact of Egret Colonies on the Nitrogen,Phosphorus and Potassium Levels of Heronry Soils

对厦门白鹭自然保护区鸡屿岛上的鹭类集群营巢地的表层土壤进行测定,比较繁殖前营巢地、繁殖后的营巢地及非营巢地土壤当中的全氮(N)、全磷(P)、全钾(K)的含量.实验测得,繁殖前营巢地土壤全氮百分含量为0.038±0.006;全磷百分含量为0.086±0.015;全钾百分含量为1.049±0.048;繁殖后营巢地土壤全氮百分含量为0.090±0.015;全磷百分含量为0.262±0.154;全钾百分含量为1.236±0.077.繁殖后营巢地的土壤含氮、磷、钾的水平均显著高于繁殖前(P<0.05),亦显著高于非繁殖地(P<0.05).说明鹭鸟的集群繁殖活动能够提高营巢地土壤的营养状况,提示这种影响经过长期积累以后可能导致营巢地植被结构和生境发生变化.

The total nitrogen,phosphorus,and potassium in the topsoil sampled from Jiyu Islet in Xiamen Egret Nature Reserve were measured.The percents of N,P,K in the topsoil collected after breeding under heronries was 0.090±0.015,0.086±0.015,and 1.236±0.077 respectively. Comparatively,the percents of N,P,K in the topsoil collected before breeding under heronries was 0.038±0.006,0.086±0.015,and 1.049±0.048.The results showed that the contents of N,P,K in the heronry topsoil after breeding were significantly greater than those in the topsoil collected before breeding(P<0.05) or than those in the topsoil without egret colonies (P<0.05).These results concluded that the nutrient levels of nitrogen,phosphorus and potassium were increased by the colonially nesting ardeinae.It implies that long-term occupancy of colony sites might lead to the changes of plant community structure and habitat in heronries.