白榆幼苗水分生理特征的研究  

Hydrological Physiological Character ofUlmus pumila Seedlings

作　　者：王熠青[1] 魏先君[2] 闫红霞[3] 贺喜格图[2] 

机构地区：[1]内蒙古自治区林业科学研究院,内蒙古呼和浩特010010 [2]内蒙古师范大学,内蒙古呼和浩特010022 [3]包钢环保绿化实业公司,内蒙古包头014010

出　　处：《内蒙古林业科技》2009年第4期12-15,共4页Journal of Inner Mongolia Forestry Science and Technology

基　　金：农业科技成果转化资金项目"生物定时水造林新技术应用成果转化"(2006GB2A400042)研究内容之一

摘　　要：对乌兰察布市察右后旗当郎忽洞苏木人工造林地土壤含水量及白榆幼苗水分生理特征进行研究,结果表明:由于长期干旱,样地土壤含水量降到7.24%以下,白榆自然含水量为64.13%,束缚水与自由水比值为1.33,其自然饱和亏缺为10.06%。持水力测定表明:白榆的持水力曲线斜率相对小。PV曲线分析表明,白榆的Ψπ100和Ψπ0值为7.97 MPa。蒸腾速率日进程变化分析表明:白榆的"午休"现象明显。The soil water content in afforested land and the hydrological physiological character of Ulmus pumila seedlings were studied. The results showed that because of long - time drought, the soil water content fell below 7.24%, the natural water content of Ulmus pumila was 64. 13%, the ratio of bound water and free water was 1.33, and the water shortage under natural saturation was 10.06%. The water - retaining capacity curve slope of Ulmus pumila was small relatively. The PV curve showed that ψπ100 and ψπ0 of Ulmus pumila was 7.97 Mpa. The daily process change of transpiration rate showed that midday depression of Ulmus pumila was obvious.

关 键 词：白榆 旱生植物 水分生理特征 

分 类 号：S792.19[农业科学—林木遗传育种]