云南设施土壤盐分累积特征研究

Characteristics of Soil Salt Accumulation in Greenhouse in Yunnan Province,China

研究了云南不同区域、不同种植年限的大棚设施土壤的盐分累积特征。结果表明:云南设施土壤耕层盐分含量为0.50～4.22g/kg,平均为1.76g/kg;大棚种植年限长的地区,土壤表层盐分含量累积明显;随着大棚种植年限的延长,盐分含量、EC值呈上升趋势;随着土壤层次的加深,盐分含量、EC值逐渐降低;Na离子(交换性Na和可溶性Na)不是导致设施土壤盐害的决定性因素。

Greenhouse cultivation has become one of the important cropping systems in Yunnan Province. The accumulation of salt caused by different fertilization may affect soil ecosystem in Greenhouse. This paper investigated salt contents in surface soil horizon in greenhouses from six major areas in Yunnan Province. The results showed that： the mean content of soil salt was 1.76 mg/kg, varied in a range of 0.50- 4.22 mg/kg. Soil salt content and EC value changed obviously in different areas. With the increase of the greenhouse age, salt content and EC values of soil increased. Soil salt accumulated mainly in the top horizon, and decreased gradually with soil depth. Na＋ is not the decisive factor for soil salinization.