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中文摘要：
外来生物的入侵可导致环境退化、生物多样性降低和食物及水资源短缺,利用本地植物或优良牧草进行替代控制是治理入侵植物的有效途径之一。采用本地禾本科植物白茅与紫茎泽兰等比例混合种植,研究了其对紫茎泽兰的竞争效应。结果表明：白茅与紫茎泽兰之间呈现很强的竞争作用,可用作紫茎泽兰的替代控制植物;白茅地上部分相对竞争力比紫茎泽兰强,其幼苗萌发早于紫茎泽兰,株高和单株平均叶面积均显著高于紫茎泽兰;二者混合种植可显著抑制紫茎泽兰的植株生长和分蘖,混合种植区紫茎泽兰的株高、单株平均叶面积和叶绿素含量分别只有其单种的49%、72%和77%;而混合种植对白茅植株生长的影响不显著,并可促进其分蘖,混合种植区的白茅分蘖数达单种区的132%。白茅的相对产量显著高于紫茎泽兰的对应指标,竞争效应参数相对产量总和〈1.0;随着混合种植时间的延长,两者的竞争关系将愈加显著。
英文摘要：
Invasive alien species may cause environmental degradation,biodiversity loss,food and water shortage,and high possibility and severity of natural disasters. It is a good way to replace invaded plant by utilizing valuable native species. In this study,same proportion of native plant Imperata cylindrica and invasive plant Ageratina adenophora was mixed cultured,aimed to understand the competition effect of I. cylindrica to A. adenophora. There was a strong competition between these two plant species. I. cylindrica had a higher competitive ability than A. adenophora,being able to heavily suppress the growth of A. adenophora by shoot competition. Compared with A. adenophora,I. cylindrica could germinate faster,and its plant height and average leaf area were significantly higher. Mixed culturing I. cylindrica and A. adenophora could significantly restrain the growth and tillering of A. adenophora,resulting in the plant height,average leaf area,and chlorophyll content of A. adenophora being 49%,72%,and 77% of those in monoculture,respectively. On the other hand,mixed culturing had no significant impact on I. cylindrica. In reverse,the tillering of I. cylindrica was promoted,with the tiller number being 132% of that in monoculture. The relative yield （RY） of I. cylindrica was significantly higher than that of A. adenophora,and the relative yield total （RYT） was lower than 1.0. With the prolonged time of mixed culturing,the relationships mentioned above became more obvious,suggesting that it would be a promising strategy to replace A. adenophora by I. cylindrica.
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