干旱区盐碱地草坪建植的坪床土改良  

The Melioration of Salin Soil for Turf Establishment in Dry Zone

作　　者：刘虎俊[1] 王继和[1] 胡明贵[1] 纪永福[1] 杨自辉[1] 

机构地区：[1]甘肃省治沙研究所,武威733000

出　　处：《草原与草坪》2003年第2期30-33,共4页Grassland and Turf

基　　金：国家科技成果转化项目"甘肃河西走廊盐渍化土地三系统治理技术"(02EFN16700788)资助

摘　　要：在干旱区盐碱地草坪建植中,淡水洗盐可降低土壤含盐量,洗盐灌水量不与盐分的淋溶量成正比。土壤全盐量为2.0%的硫酸盐型土壤,1次洗盐灌水量为0.09～0.18m3/m2,即可将土壤全盐量降至1.3%以下。种植3年紫花苜蓿后,0～30cm土层的Mg2+离子下降55.1%,K++Na+离子减少79.0%,Cl-离子下降95.86%,土壤全盐量下降77.05%,土壤容重减小,孔隙度增大,有机质含量增加。覆沙是改良盐渍化土壤的方法,覆沙厚度增至2cm时,土壤盐分明显下降。覆沙厚度增至4cm后,再增加覆沙厚度,土壤盐分下降幅度无明显增加。干旱区草坪建植的覆沙厚度应在2～4cm之间。The methods for reducing salt content in soil were studied and the results indicated that the content of salt could be decreased by fresh water, but the amount of washed salt did not response to water amount. The total salt contcut could be reduced from 2.0% to 1.3% through water washing with 0.09 to 0.18 m3 of fresh water per square meter of land. After grown alfafa for three years, Mg2+, K++Na+, and Cl- could be decreased by 55.1%, 79.0% and 95.8% respectively. Meanwhile, the density of soil could be reduce, and organic metter and pore content could be mcreased. Top dressing of sand is also an efficient method to improve saline soil in dry zone. When the thick of sand increased to 2 cm, the total salt content will be obvilously reduced. However, ofter the thick of sand is over 4 cm, the amount of reduced salt will not be increased. It is concluded that 2～4 cm of sand thickness is suitable.

关 键 词：盐碱地 土壤 改良 草坪建植 

分 类 号：S688.4[农业科学—观赏园艺]