松嫩平原羊草草地土壤水盐运动规律的研究

 羊草草地植物群落的分布与土壤水盐运动有着十分密切的关系。研究结果表明，羊草、拂子茅、獐毛和角碱蓬群落的土壤饱和导水率分别为0.0586cm·h-1，0.0567cm·h-1，0.0175cm·h-1和0.0004cm·h-1。当土壤含水量相同时，角碱蓬群落下土壤水吸力高于羊草群落。在相同的土壤水吸力范围内，角碱蓬群落下土壤非饱和导水率高于羊草群落。因此，角碱蓬群落在春季干旱时，土体内上行水流的数量和强度远远大于羊草群落。夏季降水集中时，角碱蓬群落下土体内下行水流又远远小于羊草群落。造成土体上部甚至表层的盐分积累。

EXPLORATION OF THE MOVEMENTS OF WATER AND DISSOLVED SALTS IN SOILS UNDER DIFFERENT PLANT COMMUNITIES IN ANEUROLE-PIDIUM CHINENSE GRASSLAND OF SONGNEN PLAIN

The movements of water and Total Dissolved Salts(TDS)in soils were closely related to the plant community in Aneurolepidium chinense grassland of Songnen Plain. The results of our study showed: that the water conductivity (WC) in the saturated soils,under different communities was 0.0586cm·h-1 (Aneurolepidium chinense), 0.0567cm·h-1 (Calamagrostis epigeios), 0.0175cm·h-1 (Aeluropus littoralis var. sinensis)and 0.0004cm·h-1 (Suaeda corniculata); that the soil matric suction (SMS)was greatly higher under Suaeda corniculata than under Aneurolepidium chinense when the soil moisture was similar; that the amount and velocity of upward moving water in the soil were smaller under Aneurolepidium chinense than under Suaeda corniculata, but those of downward moving water were larger under the former, therefore, it brought about the accumulation of dissolved salts in the uplayer of the soil under Suaeda corniculata,but under Aneurolepidium chinense the amount of dissolved salts decreased quickly with the precipitation in the summer.