三江源区"黑土型"退化草地垂穗披碱草人工草地毒杂草危害性分析

通过对三江源区人工草地常见三种毒杂草的危害性研究得知:就植物群落而言,甘肃马先蒿对垂穗披碱草的危害性最大,铁棒锤居中,黄帚橐吾较轻;就植物地上生物量而言,铁棒锤对垂穗披碱草的危害性最大,甘肃马先蒿次之,黄帚橐吾较轻。甘肃马先蒿、铁棒锤、黄帚橐吾的入侵,促使人工草地的逆向演替,导致了人工草地的极度退化。

Analysis of Harm of Poisonous and Weed Plants on Elymus nutans Artificial Grassland in "the Black soil Type" Degenerated Pasture of Source Area of Three Rivers

Through to study the common three kind of poisonous and weed plants in the artificial grassland in "the Black soil Type" degenerated pasture of source area of three rivers,it indicated that:speaking of the vegetation community,the harm of Pedicularis kansuensis was the greatest,the one of Aconitum pendulum was secondly and the one of Ligularia virgaurea Maxim was the lowest;speaking of the biomass of aerial part of plant,the harm of Aconitum pendulum was the greatest,the one of Pedicularis kansuensis was secondly and the one of Ligularia virgaurea Maxim was the lowest.The invasion of Pedicularis kansuensis,Aconitum Pendulum and Ligularia Virgaurea Maxim impeled the artificial grassland to reversion succession,and caused the extreme degeneration of the artificial grassland.