4种草用于南方稀土尾砂地种植的适宜性之比较

Comparison of Planting Suitability of Four Herbaceous Plants on Rare Earth Tailings in South China

采用野外小区试验和盆栽试验相结合的方法,对百喜草(Paspalum notatum)、狗芽根(Cynodon dactylon)、弯叶画眉草(Eragrostis curvula)和狼尾草(Pennisetum alopecuroides)在稀土尾砂基质上通常条件下、不施肥条件下和经历干旱胁迫下的生长状况进行观测,从生长力、耐旱性和耐瘠性3方面对4种植物在稀土尾砂地的适宜性进行了比较。结果表明,生长力以弯叶画眉草为最优,耐旱性最强的为百喜草,耐瘠性最好的是狼尾草。3个方面综合比较,百喜草和狼尾草最好,其次为弯叶画眉草,狗芽根居末位。试验结果可为南方稀土尾砂地植被恢复时根据具体情况应用这些草种提供参考。

Pot and plot experiments were conducted to observe the growth of Paspalum notatum,Cynodon dactylon,Eragrostis curvula and Pennisetum alopecuroides on the rare earth tailings under the common condition,the condition without fertilizer and that with drought stress.The suitability of the four herbaceous plants on rare earth tailings were compared from the aspects of growth ability,drought tolerance and barren tolerance.The results showed that Eragrostis curvula,Paspalum notatum and Pennisetum alopecuroides were the best in terms of growth ability,drought tolerance and barren tolerance respectively.Summing up the comparisons in the three aspects,Paspalum notatum was the best,followed orderly by Pennisetum alopecuroides,Eragrostis curvula and Cynodon dactylon.The results provided reference for application of the four plants to revegetation on rare earth tailings in South China according to concrete conditions.