| 王海珍,韩路,周正立,李志军.胡杨、灰叶胡杨水势对不同地下水位的动态响应[J].干旱地区农业研究,2007,(5):125~129 |
| 胡杨、灰叶胡杨水势对不同地下水位的动态响应 |
| Dynamical responses of Populus euphraticu and Populus pruinosa water potential to different depths of groundwater level |
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| DOI：10.7606/j.issn.1000-7601.2007.05.25 |
| 中文关键词: 胡杨 灰叶胡杨 地下水位 水势 动态响应 |
| 英文关键词:Populus euphraticu Populus pruinosa groundwater level water potential dynamical response |
| 基金项目:新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室开放基金(BR0603)； 塔里木大学校长重点基金(2004-3) |
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| 中文摘要: |
| 在不同地下水位条件下,采用植物水势仪测定了新疆荒漠区优势树种胡杨与灰叶胡杨1年生小枝的水势日、月动态变化。结果表明:不同地下水位胡杨、灰叶胡杨枝水势日、月变化均呈"V"字型曲线,一天中最低值出现在正午14∶00,一年中最低值出现在8月。清晨、正午水势月变化呈"V"字型,月份间变幅较大,月平均水势表现为6月>7月>9月>8月。胡杨水势日变幅、正午水势月变幅均小于灰叶胡杨,不同生境胡杨水势平均值均高于灰叶胡杨。方差分析表明两树种水势差异不显著但不同处理间差异显著。胡杨P-V水分参数Ψ100、Ψ0、Ψ100-Ψ0、RWC低于灰叶胡杨,而VP/V0、ROWC、AWC高于灰叶胡杨,表明两优势树种在长期适应干旱荒漠环境过程中采取了不同的生理生态对策。地下水位直接影响树木水势,两树种清晨与正午水势均随地下水位的下降而降低。 |
| 英文摘要: |
| Diurnal and monthly changes of annual shoot water potentials of dominant tree species Populus pruinosa and Populus euphratica under the different depths of groundwater level were measured by pressured chamber in desert region,Tarim,XingJing province.The results showed that diurnal and monthly changes of shoot water potential were "V" curves,the minimum value of day and year emerged in 14∶00 and August,respectively.Monthly changes of predawn and middy water potentials were "V" curves,with big change of the different month and the average water potential of months in such a order June>July>September>August.The diurnal change range of water potential and monthly change range of middy water potential of P.pruinosa were higher than that of P.euphratica and average water potentials of P.euphratica were higher than that of P.pruinosa under the different depths of groundwater level.Variance analysis showed that water potentials of two tree species were not significance,but it was extreme significance among the different depths of groundwater level.The osmotic potential at turgor loss point(Ψ0),maxium osmotic potential at water saturation point(Ψ100),relative content of apoplastic water(AWC) and relative osmotic water loss(Ψ100-Ψ0)of P-V water parameters of P.euphratica were lower than that of P.pruinosa and relative osmotic water content at turgor loss point(ROWC),relative water content at turgor loss point(RWC) and osmotic adjustment ability(VP/V0) were higher than that of P.euphratica,all above indicated that two dominant tree species adopted different physiological ecology strategy to adapt desert drought environment in the long time.The average,predawn and middy water potential decreased gradually with declining of depths of groundwater level,the depths of groundwater level effected directly water potential of trees. |
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