干旱胁迫对臭柏水分特性的影响  

Effect of Drought Stress on Water Characteristics of Sabina vulgaris

作　　者：温国胜[1] 张国盛[2] 吉川贤[3] 

机构地区：[1]浙江林学院生命科学学院,临安311300 [2]内蒙古农业大学林学院,呼和浩特010018 [3]冈山大学农学部,日本冈山市7008530

出　　处：《林业科学》2004年第5期84-87,共4页Scientia Silvae Sinicae

基　　金：国家自然科学基金资助项目 (3 0 2 40 0 3 3 ) ;浙江林学院科学研究发展基金资助项目。

摘　　要：运用PV技术 ,从天然臭柏群落和在室内干旱胁迫处理的臭柏扦插苗中分别取样 ,测定了干旱胁迫下臭柏的水分参数。天然臭柏群落选自毛乌素沙地土壤水分条件不同的沙丘上部和沙丘下部。室内干旱胁迫处理是将臭柏插穗带往日本冈山大学扦插 ,生根扦插苗移植于砾耕栽培装置中 ,设置对照区、弱干旱胁迫区、强干旱胁迫区 (培养液渗透势分别为 0 0、- 0 1、- 0 3MPa) 3种处理进行长期干旱胁迫室内模拟试验。结果表明 ,毛乌素沙地生长的臭柏 ,在不同的立地条件下 ,小枝的水分特性不同 ,在较干旱的沙丘上部 ,与较湿润的沙丘下部相比 ,膨压为 0时的渗透势 (ψs)、水饱和状态下的水势 (ψw)值减小 ,最大体积弹性模量 (ε)、细胞内的束缚水含量 (VP VO)值增大 ;干旱胁迫模拟试验条件下 ,随着干旱胁迫的增强 ,ψs 和 ψw 值减小 ,ε和VP VO 值增大 ;在干旱胁迫下 ,臭柏渗透调节能力发生了变化 ,从而证明臭柏是耐旱性可变的树种 ,通过抗旱锻炼 ,可提高其耐旱性。此外 ,还讨论了毛乌素沙地沙丘不同部位生长的臭柏小枝水势的日变化规律及干旱胁迫下培养液渗透势与水分特征参数的相关性。Water characteristics of Sabina vulgaris were studied under drought stress using pressure_volume technique and combining investigations in field and experiment in greenhouse. Investigations in field were made by sampling at upper and lower of dune where soil water content was different in Mu Us Sandy Land. Three treatments of control,light stress,strong stress (osmotic potential of culture solution was 0 0,-0 1,-0 3 MPa, respectively) were set up in water cultivation system in greenhouse of Okayama University in Japan. The results showed that osmotic potential at turgor loss point( ψ s) and water potential at water saturation point ( ψ w)decreased in Mu Us Sandy Land. However,bulk modulus of elasticity( ε ) and rate of bound water in cell (V p/ V o) increased under drought stress. In greenhouse, ψ s and ψ w got small, ε and V p/ V o became big. It was concluded that drought resistance of S.vulgaris could be varied and improved by drought training. Diurnal changes of water potential of S.vulgaris growing in Mu Us Sandy Land,and relationship between the osmotic potential of culture solution and parameters of water characteristics under drought stress were discussed.

关 键 词：干旱胁迫 臭柏 水分特性 水势 渗透势 PV技术 

分 类 号：S791.44[农业科学—林木遗传育种]