4种菊科植物与土壤间碳氮循环的初步研究

Preliminary Studies on C and N Cycle of Four Asteraceae Plants and Soil

从植物-土壤碳氮循环入手,对比研究外来入侵种飞机草、紫茎泽兰,土著种泽兰、佩兰与土壤间碳氮循环的差异,结果表明,飞机草和紫茎泽兰极大改变了生态系统中的碳、氮流,有利于加速被入侵生态系统的养分循环;且显著甚至极显著增大了生态系统中的植物碳、氮库,对土壤碳、氮库有影响但不显著;因此加快了生态系统的碳、氮循环,且这种改变对其自身有正反馈效应,这可能是其入侵成功的机制之一。

Starting from the plant - soil nitrogen and carbon cycle, the difference of C and N cycle of exotic invasive plants Eupatortum odoraturn and E. adenophorum and relative native species E. japonicum and E.fonunei and soil were compared and studied. The results showed that C and N flux in the ecosystem were changed patently by E. odoratum and E. adenophorum, which was propitious to quicken nutrient cycling of invaded ecosystem. Meanwhile, C and N stock in plants were multiplied extremely and remarkably and soil C and N stock had slight changes. So C and N cycle in the ecosystem were quickened and these changes had a positive feedback effect on itself. And this might be one successful invasion mechanism.