覆盖对滨海盐碱土水盐运动及对刺槐生长影响的研究

A Study on Effects of Different Ground Covers on Water and Salt Movement and Robinia pseudoacacia Growth in Marine Saline-alkaline Soil

通过田间试验,研究了沧州临港经济技术开发覆盖对滨海盐碱土水盐运动和刺槐生长的影响。结果表明:覆盖可以有效的保持刺槐林下地表和根系层土壤水分,减少盐分积累,并缓解水盐运动剧烈变化;地膜覆盖在根系层的保持水分和防止盐分积累的作用明显;玉米秸秆覆盖能拦蓄雨水和减少地表蒸发,抑制地表返盐、促进降雨淋盐的作用;在春季,沙子覆盖的表层土壤脱盐率高于其它两种覆盖;覆盖对刺槐的冠幅、当年枝生长有一定作用,但影响不显著,对地径生长的影响不明显。

The field experiments were conducted to study the effects of different ground covers on water and salt movement and Robinia pseudoacacia growth in marine saline-alkaline soil. The result revealed that ground covers could not only help the soil maintain high water content and low salt in surface and root layer, but also ameliorate the water and soil movement fiercely changes under the Robinia pseudoacacia. Plastic film cover have significant effects on helping the soil maintain high water content and low salt. Results also showed that straw cover could retain rainwater, hinder the run off and evaporation of water, prevent the soil from secondary salinization and promote the leaching of salts by rainwater. Sand cover could take off the salts more than those of other covers in spring. The different covers have certain effects on annual shoot growth, crown diameter; however, the effects are not significant. Also, the covers have less effect on the ground diameter growth.