凤眼莲植株碳·氮·磷含量的动态变化

[目的]为凤眼莲的利用与控制提供试验参考。[方法]在有凤眼莲生长的自然水体中,通过调查与原位试验相结合的方法,跟踪监测研究凤眼莲植株碳、氮、磷含量的变化。[结果]结果表明:在生长期初期,植株有机碳的含量迅速升高,到2004年9月底达到最大值,此后呈现下降趋势;全磷、全氮均呈"升-降-升"的趋势,分别于2005年1月初和4月初达到峰值,其中1月初分别为1.08%、4.57%,4月初分别为1.04%、4.55%,3月出现低谷。[结论]在氮磷元素的积累过程中,凤眼莲植株氮元素的含量上升缓慢,而磷元素的含量上升快。

Dynamic Changes of C, N, P in Eichhornia crassipes(Mart.)Solms

[Objective] The research aimed to provide test basis for the use and control of Eichhornia crassipes(Mart.)Solms.[Method] Under natural conditions,the changes of C,N,P concentrations in E. crassipes(Mart.)Solms were studied by field investigation and laboratory analysis.[Result] During the initial period of growing,the organic carbon of E.crassipes(Mart.)Solms increased quickly,and got the max value at the end of September,2004.Total phosphorus and total nitrogen had the trend of "increase-decrease-increase",and got the max value 1.08% and 4.57% respectively in early January,2005.There was another peak value 1.04% and 4.55% in early April,2005.[Conclusion] In the nitrogen and phosphorus accumulating process of the plant, the nitrogen content increased slowly,but the phosphorus content increased quickly.