种植柽柳对重度盐碱地改良效果分析——以应县为例

Effect of Tamarix chinensis on the Improvement of Severe Saline-alkali Land: A Case Study of Ying County

以晋北朔州市应县多年生柽柳地盐碱土为研究对象,按土壤深度和行间变化采集土壤样品,运用数理统计方式分析土壤基本情况,探讨盐碱分布格局。结果表明:在试验地内,样地含水率较大,p H值为9.56,为极强碱性土质;土壤有效铜含量与电导率之间存在正相关,但并不显著;随着土层深度的增加,柽柳地土壤p H值呈现先上升后下降的趋势,电导率、含水率均表现为逐渐上升;在远离植株的过程中,p H值和电导率均表现为先下降后上升,含水率逐渐下降。应县盐碱地土壤有效铜含量属于高等水平,积累现象明显,且有效铜含量会随着距离植株远近而变化,却不会随着土壤深度的变化而变化。试验得出,柽柳种植对降低盐碱度有一定效果,经过种植柽柳的盐碱土盐分明显低于对照,柽柳根系分布的范围在一定程度上决定了土壤盐碱性。

The saline soil of perennial Tamarix chinensis in Ying County of Shuozhou in North Shanxi Province was studied and analyzed with soil samples collected at different depth and leading changes for understanding the basic condition of soil and exploring the salinity distribution pattern. The results showed that within the test plot, its mois- ture content was high, and the pH value was 9.56, which indicated that the soil is strong alkaline soil. Positive corre- lation between available copper content in soil and electric conductivity could be found, but its was not significant. With the increase of soil depth, the pH of T. chinensis forest soil first went down and then rose, while electric con- ductivity and moisture content were gradually rising. In the process of staying away from the plants, the pH value and electric conductivity declined first and then rose, while the moisture content gradually decreased. The available cop- per content in saline-alkali soil in Ying County stays at high level, showing a obvious accumulating phenomenon. And the available copper content will change as the distances from the plant vary, but will not change with the change ef soil depth. Experiments results showed that planting T. chinensis has certain effect on reducingsalinity. And the salin- ity in the saline-alkalisoil places where T. chinensis grows is lower in content than that in control group. The distribu- tion area of of T. chinensis root system determines to some extent the salinity of soil.