柳枝稷种植年限对土壤盐分离子的影响

Effect of different switchgrass ( Panicum virgatum L. ) planting years on soil salt ions

为探明能源植物柳枝稷对盐碱土的改良效果,于2014—2015年,在宁夏大学西大滩盐碱地改良试验站田间条件下,设置1、3、5 a3个不同种植年限柳枝稷处理(T1、T3、T5),以附近未种植柳枝稷的盐碱荒地作为对照(CK),研究了不同种植年限柳枝稷对盐碱土盐分离子的影响。结果表明,随着种植年限增加,柳枝稷对土壤盐分离子的作用效果增强,土壤中的Na^+、SO_4^(2-)、Cl^-含量随种植年限增加而降低,在柳枝稷生育末期T5处理与CK相比,Na^+、SO_4^(2-)、Cl^-含量分别下降了52.64%、40.37%和63.68%;土壤中的Ca^(2+)、Mg^(2+)含量与柳枝稷种植年限呈正相关关系,在柳枝稷生育末期T5处理Ca^(2+)、Mg^(2+)含量分别比CK增加了2.22%、48.08%。本试验条件下,柳枝稷种植5年后对土壤Na^+、SO_4^(2-)和Cl^-等盐分离子的降低作用最为明显。

The field trials were conducted to explore the ameliorative effect of switchgrass （ Panicum virgatum L .） on saline alkali soil in Ningxia Xidatan. This paper studied the effects of 1, 3 and 5 years （T1, T3, T5 ） of planting switchgrass on the salt ions, taking the uncropped saline waste land adjacent to the experimental site as the control （CK） . The results showed that the effects of switchgrass on soil salt ions were enhanced, and the concentration of Na＋ , S042- and Cl- in soil decreased gradually with the increase of planting years. Compared with CK, the concentration of Na＋ , SO4^2- and Cl- of T5 decreased by 52.64% , 40.37% and 52.64% in the last growth period of switchgrass. The concentration of Ca2＋ , Mg2 ＋ was positively correlated with planting years of switchgrass, the concentration of Ca2＋ , Mg2＋ of T5 increased 2.22% and 48.08% than that of CK in the last growth period of switchgrass. Under conditions of the present study, the effects of switchgrass on soil salt ions were the most significant at the 5th year after establishment.