摘要
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。
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 Na_2CO_3, NaHCO_3, MgCO,_3 Na_2SiO_3, 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. According to results of calculation, the following condusion are made: 1. Through comparative study for the data abtained from various horizons of the soils, statistic analysis of the data from natric horizon gives the better results than those from orther horizons. 2. Through comprehensive numerical analysis, the hydrolytic alkalinity has been defined as the first important index for division of alkalization degree of desert soils, and 6 grades have been divided according the hydolytic alkalinity in combination with ESP and residual Na_2CO_3 of the soils. 3. It has been found on the basis go of comprehensive analysis, hydrolytic alkalinity> 2.6meq/100g soil, ESP>40% and residual Na_2CO_3>1.3meq/100g soil can be used as the cateria for distinguishing alkali soil.
出处
《土壤学报》
CAS
CSCD
北大核心
1990年第4期438-444,共7页
Acta Pedologica Sinica
基金
国家自然科学基金
