【摘要】 运用小波变换和室内化学分析分析了微域尺度苏打盐渍土水盐空间和时间变化特征。结果表明:小波检测的突变点主要分布在洼地边缘,沿着土壤剖面方向主要集中在土壤表层(0~30cm)。结合室内分析表明,苏打盐渍化地区表现为盐化草甸土和苏打碱土镶嵌分布的微域格局,其中盐化草甸土分布在相对低洼的部位,苏打碱土分布在微坡地和高平地。通过小波检测表明,苏打盐渍土的盐分变化过程可以分为三个时段:雨季波动期,秋后返盐期和冻融聚盐期。微弱的淋溶下渗和强烈返盐的交替变化组成了非冻融季节苏打碱土表层的盐分变化规律。冻融季节,潜水可以影响到高平地的土壤(苏打碱土)表层的积盐。冻融积盐是松嫩平原碱化程度不断加剧的重要原因之一。更多还原

【Abstract】 Soil water and salinity change with temporal and spatial dimensions in micro scale was studied by wavelet method and chemical analysis in laboratory. Results showed that node of wavelet wave largely distributed in margin of micro basin, and mainly in soil surface layer (0 - 30 cm layer). Soil distribution pattern along transect was saline meadow soil and sodic alkaline soil revealed by chemical analysis combined with wavelet method. And the former was in micro basin the latter in micro slope and flat. Three stages were divided by wavelet transformation, fluctuation period in rainy season, salinity return period in fall and salt- accumulation in frozen and thawing season. Weak leaching effect by rain and climbing upward by evaporation rapidly was main feature of salinity in sodic alkaline soil in unfrozen season. In frozen- thawing season, salt accumulation of soil in flat (soidc alkaline soil) could effect by shallow groundwater. Salt accumulation by frozen- thawing action was being an important factor for soil salinity accumulation in Songnen plain更多还原