土壤总盐、pH及总碱度空间变异特征研究

在新垦土地以 15m×15m 的网格分 3 层采集土壤样品,对不同层次土壤总盐、pH 及总碱度的空间变异性进行研究。结果表明:研究区土壤总盐含量普遍较低,土壤表层积盐作用不明显;土壤 pH 及总碱度较高,普遍达到碱化指标;不同层次土壤总盐与总碱度为中等程度变异水平,pH 为弱变异水平;不同层次土壤总盐、pH 及总碱度的空间变异特征具有一定的差异,但结构性因素对三者的空间变异起主导作用。利用 Kriging 插值法绘制土壤盐分、pH 及总碱度的等值线图,可以作为土壤盐碱改良的依据。

SPATIAL VARIABILITY OF SOIL TOTAL SALT, PH AND TOTAL ALKALINITY

Soil samples were taken from 3 layers of each of the profiles distributed in a pattern of 15m×15m grid over a newly-reclaimed field, and used to determine space variability of total salt, pH and total alkalinity from layer to layer. The results indicate that the total salt content of the research area is generally low, salt accumulation at the surface soil layer is not significant; Soil pH and the total alkalinity is high, generally enough to meet the criteria of soil alkalization; The variation between soil layers in total salt and total alkalinity is moderate, and rather minor in pH; Characteristics of the spatial variation of salt, pH and total alkalinity somewhat differ between the three soil layers, with structural factors playing a leading role. The isoline maps of soil salt content, pH and total alkalinity are obtained with Kriging''s interpolation method, and can be used as the basis for amelioration of saline-alkali soils.