乌梁素海流域土壤盐分和pH值空间分布格局研究

摘要

Soil salinization is one of the most important bottlenecks for the sustainable development of agriculture in the Wuliangsuhai basin. Focusing on the spatial complexity and recurrence of soil saliniza-tion in Wuliangsuhai basin, this paper has collected layered samples from 0 cm to 30 cm from 20 repre-sentative sampling points according to the characteristics of vegetation there. The total salinity and pH of the soil were determined with the method of conductivity and potentiometry. Meanwhile, the spatial dis-tribution of soil salinity and pH in this researched area was obtained from the Surfer Software ( Kriging) . The results show that the soil salinity and pH have a remarkable tendency of gathering on the surface in the spatial distribution. What' s more, the soil salinization tends to decrease along with the deepening of soil layer. As a whole, the soil salinization is a rather serious problem in Wuliangsuhai basin. Apart from controlling salinity in spring, some other measures are needed, such as irrigation and the use of chemical modifier. 3figs. ,1tab. ,19refs.%土壤盐碱化是制约乌梁素海流域农业可持续发展的重要瓶颈之一,该文针对乌梁素海流域土壤盐碱化的空间复杂性与反复发生性,根据乌梁素海流域植被特征,采集了20个代表性样点的土壤0~30cm分层样品.利用电导法和电位法分别测定了土壤中总含盐量和pH,运用surfer插值软件克里金插值法( Kriging)得到了研究区的土壤盐分和pH值的空间分布.研究结果表明：在空间分布上乌梁素海流域土壤中盐分和pH呈现出显著地表聚趋势,而且随着土层的加深盐碱化程度呈现降低的趋势.总体上说,乌梁素海流域土壤的盐碱化现象仍较严重,除春季压盐措施外,需要进行灌溉方式改善和化学改良剂使用等盐碱化治理措施.图3,表1,参19.