保水剂对高羊茅生长和水分利用效率的影响

Effects of Aquasorb on the Growth and Water Use Efficiency of Tall Fescue

在充分供水和限量供水2种水分处理条件下,分别对高羊茅施用不同用量的保水剂,研究其生长特性和水分利用特征.结果表明:在充分和限量供水条件下,施用保水剂可以使高羊茅保持较高的叶片水势和较高的叶片含水量,并降低叶片的蒸散量;在保水剂用量为30 g/m2的处理方式下,株高净增长量、生物量均最大;不同处理的高羊茅根冠比在充分供水时的大小顺序为60 g/m2>90g/m2>对照>30 g/m2,限量供水时为30 g/m2>60 g/m2>对照>90 g/m2;水分利用效率在充分供水时30 g/m2处理最高,而限量供水时水分利用效率随保水剂用量的增加而上升,90 g/m2的处理最高,达2.17 g/kg.

This paper conducted a study of the growth characteristics and water use efficiency （WUE） of tall rescue under two different water and three aquasorb treatments. Results show that applying aquasorb to the planting of tall rescue can make it keep a higher leaf water potential and water content and reduce leaf evapo-transpiration, and the treatment of using 30 g/m^2 aquasorb can also make it keep the highest net height and biomass growth ; that with sufficient water supply, the root-crown ratio goes down with the different treatments in the order of 60 g/m2〉90 g/m^2〉the contrast〉30 g/m2 but with limited supply, the ratio obeys the order： 30 g/m^2〉60 g/m^2〉the contrast〉90 g/m^2; and that the WUE can he kept at the highest level with the treatment of 30 g/m^2 under sufficient water supply but with limited supply, it increases remarkably with the use of a bigger dose of aquasorb, and when the dose is 90 g/m^2, it reaches the highest value 2.17 g/kg.