地毯草对铝胁迫响应及临界浓度的研究

摘要

Axonopus compressus (Sw.) Beauv. Was used as the main research object for the study. The different Al3+ tolerance of carpet grass were determined by turf quality, leaf color, and leaf firing percentage in hydroponics experiment. The results showed that there were significant or very significant differences between Al3+ treatments and the optimum growth of carpet grass were medium concentration (0.72, 0.96, 1.20 mmol/L) of Al3+. Too high(0, 0.24, 0.48mmol/L) or low concentrations (1.68, 1.92, 2.16 mmol/L) of Al3+ treatments inhibited the normal growth of carpet grass and led to lower turf quality. However, medium concentration(0.72 mmol/L) would contribute to turf quality of carper grass and improve their ornamental value. By building regression equation, take leaf firing percentage dropped 50% as index to determine survival, and working out lethal AP concentration of carpet grass was 2.04 mmol/L.%以地毯草为研究对象,利用水培法进行耐铝鉴定,初步研究不同铝浓度处理对地毯草坪用质量、叶色和枯黄率的影响.结果表明,不同处理浓度之间存在显著或极显著性差异,中等浓度(0.72、0.96、1.20 mmol/L)铝处理下,地毯草坪用价值明显优于低浓度(0、0.24、0.48 mmol/L)和高浓度的铝处理(1.68、1.92、2.16 mmol/L),呈抛物线形状；0.72 mmol/L铝处理最适宜地毯草的生长.其它高浓度或低浓度都抑制了地毯草的正常生长,从而导致地毯草草坪使用价值下降.通过建立回归方程,以枯黄率下降50％作为地毯草存活临界铝离子浓度,可得地毯草具有50％存活的临界铝离子浓度为2.04 mmol/L.