摘要
用离心法测定了覆盖黑垆土剖面各层土壤０×１０５ｐａ～１５×１０５ｐａ基质吸力范围内的脱水曲线，结果与Ｓ＝ａθ－ｂ拟合很好。以此为依据对覆盖黑垆土各层土壤的持水性、抗旱性和孔隙性进行了分析，发现覆盖黑垆土耕作层持水能力较弱，但抗旱性强，适宜干旱、半干旱地区作物苗期生长。垆士层持水能力强，但抗旱性最差，不利于雨水下渗，但有利于土壤深层水的保持。母质层具有持水能力强和抗旱性好的特点，加之土层深厚，是覆盖黑垆土的真正“蓄水库”。
Desiccative curve covering each Heilu soil profile in the range of sub-strate suction from Ox105 pa to 15x105pa was determined using centrifugal method.Theresults were well─fitted with S=aθ-b.Based on which ,the misture holding capacity,drought resistant ability and porosity of each layer of Heilu soil were analysed thereby tofind out that water─holding capacity of the tilth layer covered with Heilu soil was weakbut strongly resistant to drought ,which was suitable for crop seedlings to grow in thearid and semiarid areas ,while Heilu soil layer had a good water-holding capacity butwas poor in drought resistance,being unfavourable for rainfall to infiltrate butfavourable for conserving water in deep layer. Tge parent layer is characterized withgood water─holding capacity and good drought resistance.Which its htick soil layer,itcan become a real “storage reservoir”to cover Heilu soil.
出处
《干旱地区农业研究》
CSCD
北大核心
1995年第3期33-37,共5页
Agricultural Research in the Arid Areas
基金
国家"八五"攻关课题
关键词
覆盖黑垆土
持水性
抗旱性
mulching Helilu soil
water─holding capacity
drought resistance
