古尔班通古特沙漠原生梭梭树干液流及耗水量

梭梭广泛分布于我国西部干旱区，利用热脉冲技术对古尔班通古特沙漠生长期原生梭梭的树干液流耗水特征进行了研究。随着水分条件的不同，影响树干液流过程的主导因素有所不同。根区土壤体积含水量在8.7%-12.1%时，梭梭日树干液流量与土壤水分显著相关；土壤含水量＞12.1%时，液流更多的受到气象因素的影响；土壤含水量＜8.7%，树干液流与气象要素之间没有相关性，液流更多的受植物生理特征影响。在土壤水分最丰富的4月份，随着土壤水分的降低，白天与夜间的液流变化趋同；4月份日平均液流量约是5-9月份的2倍。梭梭的液流通量从古尔班通古特沙漠原生林的0.156L?cm-2?d-1到塔中人工滴灌林的0.876 L?cm-2?d-1，均处于正常生长状态，表明梭梭生态需水的可塑性范围较广。基径为7.8cm和9.0cm的梭梭在4月至9月份生长期的实际耗水量分别是95mm和117mm。

Trunk sap flow and water consumption of Haloxylon ammodendron growing in the Gurbantunggut Desert

Haloxylon ammodendron distributes widely in the west arid region of China.Studying its water consumption will be beneficial to quantifying ecological water requirement and re-vegetating the desertification region.In the current study,the heat pulse technique was applied to study the trunk sap flow of Haloxylon ammodendron in the Gurbantunggut Desert during the whole growing season.The results showed that the diurnal variation of sap flow of Haloxylon ammodendron was affected multiply by soil moisture,meteor...