地毯草对铝胁迫响应及临界浓度的研究

Study on Responses of Axonopus compressus(Sw.) Beauv. to Aluminum Stress and Critical Aluminum Concentration

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。

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（0,0.24,0.48 mmol/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 Al3＋ concentration of carpet grass was 2.04 mmol/L.