四翅滨藜改良盐碱地效果动态变化

Dynamic Change of Improving Effect of Atriplex canescens on Saline-alkaline Soil

采用田间试验的方法,对四翅滨藜定植2a后各土层养分质量分数变化进行研究。结果表明:四翅滨藜是一种耐盐性极强的盐生树种,定植2a间各土层化学成分变化差异显著。其中全盐下降57.19%,pH值下降3.25%,有机质提高26.34%,全氮增长42.78%,速效磷增长84.15%,速效钾增长11.78%,且改良效果均明显优于对照地垂柳。不同土层深度(h)全盐、pH值降幅,20cm<h≤40cm土层优于其它土层,第一年效果优于第二年效果。有机质、全氮、速效磷、速效钾改良效果定植第二年效果优于第一年,20cm<h≤40cm、40cm<h≤60cm土层效果优于0<h≤20cm土层效果。这说明四翅滨藜是一种耐盐能力很强的盐生植物,较垂柳改良土壤作用明显。

Field trials were conducted to study the change of soil nutrient content in different soil layers two years after planting Atriplex canescens. Results indicates that A. canescens has high salt-tolerance. The changes of the chemical compositions at different depths of soil were remarkable, anlong which the total salt and pH decreased by 57.19% and 3.25% respectively, and the contents of organic matter, total nitrogen, available phosphorous and available potassium increased by 26.34%, 42.78% , 84.15% and 11.78% respectively. The improving effect ofA. canescens was better than those of Salix babylonica planted in the saline soil used as the control. The decrease ranges of total salt and pH in 20-40 cm soil layer were superior to the other soil layers, and the effect in the first year was better than that in the second year. However, the improving effects of organic matter content, total nitrogen, available phosphorous and available potassium in the second year were better than those in the first year, the effects of 20-40cm and 40-60 cm soil layers were better than that of 0-20cm soil layer. Therefore, the improving effect of A. canescens on the saline soil is more remarkable than that of S. babylonica.