土壤低吸力段持水性能及其与早期土壤干旱的关系研究

本文研究了东北5种耕作土壤<1巴的低吸力段持水性能,包括影响低吸力段持水量的因素、所吸持水分对植物的有效程度、比水容量及脱水速度等.根据东北地区春旱尽管程度不同,但发生较为普遍的这一特点,分析、比较各种土壤基质本身存在的差异,并就它们对早期土壤干旱的抗逆能力作出评价.结果表明,熟化程度较高的草甸棕壤最优,而砂壤质冲积性草甸土最差.

STUDIES ON THE RELATIONSHIP BETWEEN SOIL WATER-RETENTION CHARACTERS IN LOW SUCTION RANGE AND THE EARLY STAGE OF SOIL DROUGHT

It is generally considered that tensiometer is only suitable for investigation of water-retention characters in low suction range on irrigated soils.But, it may also be adaptable for studying the dry cultivated (non-irrigated) soils in Northeast China, because in the presence of seasonal frozen layer the moisture content in upper soil layersis higher in early spring.The present paper deals mainly with the resistance of soil matrix in the early stage of soil drought.The soil factors influencing the water-retention characters in low suction range are prmarily the texture, secondly the organic matter.Besides, temperature is one of the most important environmental factors.