青甘宁地区钙积干旱土的主要诊断层和诊断特性及其合理利用  

THE MAIN DIAGNOSTIC HORIZONS AND FEATURES OF CALCIC ARIDISOLS AND ITS RATIONAL UTILIZATION IN QINGHAI,GANSU AND NINGXIA AREAS

作　　者：胡双熙[1] 章家恩[1] 

机构地区：[1]兰州大学地理系,兰州730000

出　　处：《干旱区资源与环境》1993年第Z1期238-242,共5页Journal of Arid Land Resources and Environment

摘　　要：钙积干旱土是具有钙积层、超钙积层或石灰磐的钙积干旱土(龚子同1989)。包括灰钙土和棕钙土两个土类。灰钙土沿青海省龙羊峡—宁夏平罗间黄河谷地及其支流两侧的黄土台地、黄土丘陵和丘间盆地分布。棕钙土主要见于青海省柴达木盆地东部及甘肃省景泰和宁夏的干塘一带。河西走郎祁连山麓东段和西段分别有灰钙土和棕钙土分布。Calcic aridisols are those which contain the calcic horizon, the hypercalcic horizon orthe limepanic horizon, this suborder includes sierozems and brown calcic soils. The formeris mainly found on the loess plateforms, loess hills and inter-hilly basins, which are situatedat two banks of Yellow River valley and its tributaries from Longyang canyon in Qinghaiprovince to Pingluo in Ningxia Autonomous region. The latter usually appears in the eastChaidamu basin in Qinghai Province, Jingtai in Gansu Province and Gantang in NingxiaAutonomous region. The study areas have temperate or warm temperate climate, the annu-al precipitation is 160- 320mm, the mean annual temperature is 3-9 degrees centigrade, theactive accumulated temperature is 1,500-3,300. The vegetation takes desert steppe or desertwith sparse grass as its main constituent. The parent materials mainly are loesses, aeoliansediments, sedentary products and slope deposits. More important is that the dried time ofwhole hydro-controlled section exceeds half a year during most of years. firstly, this paper expounds the main diagnostic horizons and features. Sierozems arecalcic aridisols with the thick ochric epipedon and the mycelioid or spotted calcic horizon,they have: (1) desertic characteristic; (2) ochrihumic epipedon; (3) calcic horizon; (4) gypsicevidence; (5) salic evidence; (6) secondary clayific evidence; (7) siallic feature. Brown calcicsoils are calcic aridisols with the thin ochric epipedon and the panic or layered calcic hori-zon, they possess: (1) desertic characteristic; (2) ochrihumic epipedon; (3) secondary clayifichorizon; (4) alkalic evidence; (5) calcic horizon; (6) gypsic horizon; (7) salic evidence; (8)siallic feature. Secondly, this paper presents a proposal of calcic aridisols taxonomic classification aswell. Sierozems are divided into five subgroups: (1) haplic sierozem; (2) umbric sierozem; (3)ochric sierozem; (4) gypsic sierozem; (5) aquic sierozem. Brown calcic soils are classified in-to: (1) haplic brown calcic soil; (2) umbric brown

关 键 词：钙积干旱土 诊断层 诊断特征 

分 类 号：S423[农业科学—植物保护] X2[环境科学与工程—环境科学]