准噶尔盆地温带荒漠土壤碱化分级的初步研究

准噶尔盆地温带荒漠碱化土壤是一种典型的脱盐碱化土壤,它受交换性钠(镁)和能产生水解作用的强碱弱酸盐水解引起的碱度的影响。在多年野外调查和碱化土壤特性研究的基础上,利用综合数值分析法对这些土壤进行了研究。提出了准噶尔盆地温带荒漠土壤碱化分级的具体指标和数据,并确定了水解性碱度为分级的第一重要指标。在推动和简化荒漠土壤分级上起了积极的作用。

A STUDY ON DIVISION OF ALKALINIZATION OF TEMPERATE DESERT SOILS IN ZHUNGER BASIN

In desert alkalized soils, the alkalinity can be induced by both the hydrolysis of exchangeable sodium (or magnesium) in soil and that of the salts such as Na₂CO₃, NaHCO₃, MgCO₃, Na₂SiO₃, etc., at the same time, the determination of exchangeable properties is moredifficult due to the presence of line and gypsum in soils; therefore, hgdrolytic alkalinity is suggested by the authors as the new index for the division of alkalization of the sods. For providing our suggestion, hydrolytic alkalinity, pH, ESP, exchangeable sodium, residual sodium carbonate and SAR of 31 profiles were determined and the data obtained were studied using comprhensive numerical analysis method.