温带半干旱地区草坪草与主要杂草抗旱性的比较研究

Comparative analysis of the drought-resistances for turfgrass and main weeds in the temperate semi-arid region.

测定温带半干旱区草坪草 (草地早熟禾 )和 6种主要杂草 (早开堇菜、止血马唐、鼠掌老鹳草、鹅绒委陵菜、欧亚旋复花、铺地委陵菜 )的萎蔫系数和干旱胁迫下的存活天数 ,根据耗水系数对 7种植物的抗旱性进行了比较。结果表明 ,止血马唐的萎蔫系数最小 ,草地早熟禾的萎蔫系数次之 ,欧亚旋复花的萎蔫系数最大 ,草地早熟禾、止血马唐的萎蔫系数分别与欧亚旋复花、鼠掌老鹳草的萎蔫系数有显著差异。 7种植物的生理抗旱性大小依次是草地早熟禾 >止血马唐 >铺地委陵菜 >鹅绒委陵菜 >早开堇菜 >鼠掌老鹳草 >欧亚旋复花。

The wilting coefficients and the survival days of turfgrass (Poa pratensis) and 6 main weeds (Viola prionantha,Digitaria ischaemum,Geranium sibiricum,Potentilla anserine,Inula britanica and Potentilla supina) in the temperate semi-arid region were measured under drought stress and the drought-resistances were compared according to the soil water depleted index (SWDI).The results showed that the wilting coefficient of Digitaria ischaemum was the lowest,then Poa pratensi the second,and that of Inula britanica was the highest.The wilting coefficients of Poa pratensis,Digitaria ischaemum were remarkably different from that of Inula britanica and Geranium sibiricum.The physiological drought-resistances of the seven species were in the order of Poa pratensis> Digitaria ischaemum> Potentilla supina> Potentilla anserina> Viola prionantha> Geranium sibiricum> Inula britanica.