水分胁迫对5个沙柳种源苗木水势和蒸腾耗水的影响  

Effect of different water supply on water potentinal and transpiring water-consumption of five Salix psammophila provenances

作　　者：赵燕[1] 李吉跃[1] 刘海燕[1] 黄看看[1] 李佳[2] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室 [2]西北农林科技大学林学院

出　　处：《北京林业大学学报》2008年第5期19-25,共7页Journal of Beijing Forestry University

基　　金：北京市科技计划资助项目(D0605001040191);北京林业大学省部共建森林培育与保护教育部重点实验室课题(JD100220535)

摘　　要：采用BP3400精密天平等仪器研究了不同浇水量5个沙柳种源的日蒸腾耗水量,用压力室法测定了苗木的叶水势,得出了苗木在不同浇水量情况下水势和蒸腾耗水的变化规律。结果表明,5个沙柳种源苗木随着水分胁迫的加重,水势逐渐降低;在相同的水分条件下,不同种源的苗木有不同的蒸腾耗水量,相同种源苗木的蒸腾耗水量随着水分胁迫的加重而减少,严重水分胁迫时日耗水总量较充分供水时下降了63.57%(榆林种源)、67.89%(乌审旗种源)、68.26%(民勤种源)、59.58%(达拉特旗种源)和58.03%(盐池种源),其中民勤种源降幅最大。通过研究苗木在不同的浇水量条件下的水势和蒸腾耗水规律,为干旱沙区选择耐旱性较强的沙柳种源提供依据。Daily changes in transpiring water-consumption of five Salix psammophila provenances under the condition of different water supply were studied by BP3400 precision balance, etc. Leaf water potential was measured using pressure chamber and water potential and the water-consumption patterns of seedlings under the condition of different water-supply were observed. The results show that water potential of five provenances decreased with declining water supply and seedlings of different provenances had different water consumptions in the same water status. The water consumption of seedlings decreased with increasing drought stress, while water-consumption rate of five provenances decreased with declining water supply. When the seedlings were in serious drought stress, the daily amount of water consumption decreased by 63.57% （Yulin provenance）, 67.89 % （Wushenqi provenance）, 68.26 % （ Minqin provenance）, 59.28 % （ Dalateqi provenance）, 58.03 % （Yanchi provenance）of those in sufficient water supply and that of Minqin provenance decreased the most. By studing water potential and the water-consumption patterns of seedlings under the condition of different water- supply,it may be beneficial to choose Salix psammophila provenance with strong drought tolerance in arid desert regions.

关 键 词：沙柳 浇水量 种源 耗水量 

分 类 号：S718.43[农业科学—林学]