额济纳绿洲中柽柳耗水规律的研究

本文利用热脉冲技术对黑河下游额济纳绿洲的柽柳灌丛液流进行了测定。结果表明:在正常生长下,柽柳在开始生长的初期(5-6上旬),单位面积液流通量为0.05-0.08L.cm-2.d-1;日平均耗水量为0.8-1.2L.d-1,在生长旺盛时期,液流通量为0.06-0.108L.cm-2.d-1;日平均耗水量为1.1-1.5L.d-1;在生长的后期(6月-9月),液流通量明显下降(9月下旬-10月),液流通量为0.04-0.06L.cm-2.d-1;在液流的日变化中,树液流速具有的多峰变化趋势,在中午有短暂液流明显减小的现象,晚上有明显液流上升,以补充树冠部分的水分储存;随着胸径的增大,茎流速率和茎流量也随之增大;在生长季节地径4-5cm的柽柳日平均耗水量1.25L,整个生长季节耗水量为150.8L。

Studies on the Water Consumption Rhythm of Tamarix spp in Ejina Oasis

The heat-pulse technique was applied to the observation of Tamarix.spp Boscagestem sap flow.The results showed that in normal conditionthe Tamarix.Spp was begun to grow in May or June(the first ten days of a month),and the sap flow was 0.050.08L cm~(-2) d~(-1),the average water consumption one day was 0.8-1.2L d.In period of blooming,the sap flow was 0.06-0.108L cm~(-2) d~(-1),and the average consumption of water was 1.1-1.5L d~(-1).In growth anaphase(the lastten days of Sep.-Dec.),the sap flow was 0.04-0.06L·cm~(-2)·d~(-1).The daily change of stem sap flow was: it has multi-peak character:at the noon stem sap flow decreasedin brevity time,but at night the stem sap flowincreased.For different diameter of the trees,the stem sap flows increased along with the increase of tree diameter.In growth season the daily consumption of water was 1.25L for a tree its stem diameter was 4-5cm;in total growth season it spent 150.8L of water.