紫花苜蓿对盐渍化土地理化性质的影响  

The effect of alfalfa on physical and chemical properties of saline soil

作　　者：张晓琴[1] 胡明贵[1] 

机构地区：[1]甘肃省治沙研究所,甘肃武威733000

出　　处：《草业科学》2004年第11期31-34,共4页Pratacultural Science

摘　　要：在临泽小泉子滩盐渍化土地,种植苜蓿Medicagosativa2～6年后,土壤盐分、土壤容重及孔隙度、土壤机械组成都发生了显著的变化。0～30cm土层全盐量从1 86%下降至1 19%,盐分下降36 18%。SO42-和Cl-分别下降19 1%,86 37%;Mg2+,K++Na+分别下降68 22%,81 30%;Ca2+,HCO3-和pH值无明显的变化。0～20cm土层中土壤容重平均下降12 69%,孔隙度平均增加13 02%。可见苜蓿对盐渍化土壤的改良效果显著。After growing alfalfa 2-6 years, the content of salt, unit density, porosity and physical structure of the saline soil in Xiao-quan-zi-tan, Linze, changed significantly. The total dissolved salt of 0～30 cm soil decreased from 1.86% to 1.19%, the salt decrease ratio is 36.18%. SO_4^(2-)and Cl^- reduced 19.1% and 86.37%, respectively. Mg^(2+)and K^++Na^+ reduced 68.22% and 81.30% respectively; Ca^(2+),HCO_3^- and pH did not give obvious change. The average reduction of unit density in 0～20 cm soil was 12.69%, and porosity increased 13.02% averagely. The effect of alfalfa on saline soil improvement was significant.

关 键 词：苜蓿 盐渍化土壤 理化性质 

分 类 号：S156[农业科学—土壤学]