大庆盐渍土壤pH值的空间异质性

选取大庆市盐碱地的退化草场为研究对象,选取不同植被样地,测其表层土壤pH值,根据克立格法的原理,依据已知点的数据(pH值)绘制各样地土壤pH值空间分布图,结果表明:在种草恢复地区(A区),植被生长繁茂,碱斑明显且集中,碱斑周围生长的草本植物密集,生长状况良好;在荒废草场地区(B区),草本植物密疏错落分布,生长不均匀,且生长状况不好,碱斑面积较大,可能是由于植被已被破坏、地势等原因,土壤及土壤母质中所含的可溶性盐类,在强烈的地表蒸发作用下,通过土壤毛管,在水分的携带下,于地表和上层土体中不断累积,致使pH值偏高;在人为耕种地区(C区),耕地上只有少数作物,大部分土地裸露,蒸发量大,造成次生盐碱化,盐渍化较前两者严重且带状曲折不规则,部分农作物已经死亡。

Spatial Heterogeneity of pH Value of Saline-alkali Soil in Daqing

An experiment was conducted to measure the pH value of surface soil in degenerated saline grassland with different vegetations in Daqing suburb. A map of spatial distribution for pH values was drawn in terms of the known pH data by Kriging theory. Results show that in the grass restoration area (Area A), the vegetations grow well and the salined soil is obviously concentrated. In the abandoned grassland area (Area B), herbaceous plants scatter disproportionately and grow badly, and the area of salined soil is larger. In Area B, pH value is higher due to the destroyed vegetation, topography and solvable saline accumulating in the soil. In the cultivation area (Area C), only a few crops were found, and most of the land is bared of vegetation and the higher evaporation results in soil salinization. Compared with Area A and Area B, the degree of salinization in Area C is more serious, and some crops are dead.