水分胁迫下保水剂对高羊茅水分利用效果的作用

Effects of super absorbent polymers on moisture application of Tall Fescue under water stress

通过盆栽控水试验,研究不同种类和不同用量保水剂对土壤水分、高羊茅Festuca arundinacea生长特性和水分利用的影响。结果表明:施用BASF-Luquasorb保水剂90 g/m2、AQUASORB保水剂30 g/m2和延绿型保水剂290 g/m2处理的土壤含水量日下降幅度变小;BASF和延绿型580 g/m2,AQUASORB 90g/m2处理的高羊茅叶片水势下降缓慢,且能保持较高叶片水势;施用保水剂BASF 90 g/m2,AQUASORB60 g/m2,延绿型保水剂870 g/m2的高羊茅蒸散量都低于对照,分别节水24.3、17.61和17.32 g/d;在3种保水剂中,延绿型保水剂处理的高羊茅平均垂直生长速率最高,约为2.71 mm/d。BASF和AQUASORB处理的草屑增量和水分利用效率都高于对照,但延绿型保水剂580和870 g/m2草屑增量和水分利用效率则低于对照。

In order to study the effects of different types and application concentrations of super absorbent polymers on soil water content, the growth characteristics of Tall Fescue and water use efficiency（WUE）, potted plant experiments with water retention tests were conducted. The results showed that there were significantly differences in the effects of different types and application concentrations of super absorbent polymers on soil water retention, the decline rates of soil water content in tbe treatments with 90 g/m2 of BASF, 30 g/m2 of AQUASORB and 290 g/m2 of YANLV were smaller than those of others in one day; the trealments with 580 g/m2 of BASF and YANLV, 90 g/m2 of AQUASORB maintained higher leaf water potential and lower decline rate of water potential; The water amounts of evaporation and transpiration in the treatments with 90 g/m2 of BASF, 60 g/m2 of AQUASORB, 870 g/m2 of YANLV were lower than the control, which saved water by 24.3, 17.61, 17.32 g/d, respectively; The average growth rate of plant treated with YANLV was the highest in three super absorbent polymers, about 2.71 mm/d. The cutting litter and WUE of Tall Fescue treated with BASF and AQUASORB were both higher than the control, but the values treated with 580 and 870 g/m2 of YANLV were lower than the control.