论文部分内容阅读
以黄土高原西部荒漠草原区广泛分布的红砂灌丛为研究对象,对灌丛周围土壤盐分和养分的富集状况进行了研究。结果表明:红砂灌丛下土壤养分明显高于灌丛外,且表层0-10cm土壤养分的富集率较10-20cm要高,灌丛下p H值和电导率显著提高,主要盐离子(HCO-3、Cl-、SO2-4、K+、Na+、Mg2+、Ca2+)含量在灌丛内外表层土壤中均存在显著差异,其中Cl-、SO2-4、Na+含量差异最为显著。相对于K+、Mg2+、Ca2+三种离子,Na+在红砂灌丛下的富集程度更强,而SO2-4和Cl-在灌丛内外的积累速率基本处于平衡状态。相关分析表明,大部分盐分离子的积累与灌丛周围养分的富集存在显著的正相关关系。
The red sand shrubs widely distributed in the western desert steppe area of the Loess Plateau were selected to study the enrichment of soil salinity and nutrients around the shrublands. The results showed that the soil nutrients in the red sand shrubs were significantly higher than those in the shrubs, and the enrichment rate of 0-10 cm soil nutrients in the surface layer was higher than that in the 10-20 cm layer. The p H value and conductivity were significantly increased under shrubs. The main salt ions (HCO-3, Cl-, SO2-4, K +, Na +, Mg2 +, Ca2 +) in shrubs were significantly different in the topsoil and shrubs, and the content of Cl-, SO2-4 and Na + was the most significant difference. Compared with K +, Mg2 + and Ca2 + ions, Na + accumulates more strongly in the red sand shrubs, while the accumulation rate of SO2-4 and Cl- in the shrubs is basically in equilibrium. Correlation analysis showed that there was a significant positive correlation between accumulation of most of the salt ions and enrichment of nutrients around the shrubs.