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作 者:鲁萍[1] 干珠扎布[1] 梁慧[1] 白雅梅[1] 徐广惠[1] 田秋阳[1] 陈春锋[1] 王宏燕[1]
机构地区:[1]东北农业大学资源与环境学院,哈尔滨150030
出 处:《生态学杂志》2011年第8期1590-1597,共8页Chinese Journal of Ecology
基 金:黑龙江省教育厅科学技术研究项目(11541034);国家自然科学基金项目(30900218);中国博士后科学基金项目(20080430874);中国博士后科学基金特别项目(200902368);黑龙江省博士后项目(LBH-Z07241);东北农业大学科学研究基金项目资助
摘 要:为探讨反枝苋(Amaranthus retroflexus)在入侵农田生态系统过程中的化感作用与资源竞争能力之间的关系,采用添加活性炭的方法,比较了在有无活性炭条件下,反枝苋与大豆(Glycine max)的生物量积累、生物量分配及不同器官含氮量随供氮水平的变化情况。结果表明,在低供氮水平时,化感作用在竞争中占有的比重较大,在高供氮水平时,化感作用所占的比重相对降低;在高供氮条件下,反枝苋增加了对根和叶的生物量分配,而在低供氮条件下,则增加对繁殖器官的生物量分配;在氮素营养贫瘠的条件下,添加活性炭的大豆含氮量要明显小于不添加活性炭时,随着供氮水平的上升,差异逐渐减小。说明在入侵过程中,反枝苋可以通过调节自身的化感作用和生物量分配来适应不同的氮素营养条件。In order to approach the relationships between the allelopathy and the resource competition capability of Amaranthus retroflexus during its invasion to farmland ecosystem,a sand culture experiment with A.retroflexus and Glycine max was conducted to study the biomass accumulation and allocation and the nitrogen content in different organs of the two plants under four levels of nitrogen supply with or without the addition of activated carbon.Under lower nitrogen supply,the allelopathic potential of A.retroflexus increased,and its biomass was mainly allocated to reproduction organs,under higher nitrogen supply,the allelopathic potential of A.retroflexus decreased,and its biomass was mainly allocated to root and leaf.Under the conditions of poorer nitrogen nutrition,the nitrogen content of G.max was significantly lower when active carbon was added,compared with the control,but the difference became smaller when the nitrogen supply was increasing.These results suggested that the A.retroflexus during its invasion could adjust its allelopathic potential and biomass allocation to adapt different levels of nitrogen nutrition.
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