杉木、马尾松裸根苗水分关系研究

Water relation parameters of bare-root seedlings of Chinese fir (Cunninghamia lanceolata Hook.)and Masson pine (Pinus massoniana Lamb.)were measured and changes of root growth potential as well as field survival rate of both species were studied after the bare-root seedlings were exposed in a sunny field condition.the results showed that masson pine had a lower osmotic potential(-2.07Mpa) at turgor loss point and at full turgor(-1.29Mpa),compared with Chinese fir(-1.80Mpa and -1.08Mpa respectively).The parameter Vp/Vo(63.27%) of Masson pine was higher than that of chinese fir (58.03%).This means that Masson pine has a stronger ability to tolerate desiccation,compared to Chinese fir according to analysis of above water relation parameters.Root growth potential and field survival rate decreased with prolonging duration of exposure.The field survival rate of both species was reduced to less than 40% after the seedling being exposed only two hours.Water potentials of -1.60 Mpa and -1.70 Mpa were suggested to be critical values for Chinese fir and Masson pine respectively in successful reforestation.     

盐份和遮阴对草莓叶水势和离子组成的影响

盐份和遮阴对草莓叶水势和离子组成的影响〔英〕Ｙ、Ｂ、Ａｗａｎｇ等遮荫使植株许多环境因素发生变化，但是，光照似乎是受影响最大的因子。未遮荫区，株高处光照的日平均总强度是４．９ＭＪ／ｍ２ｄ，遮荫区是２。ＭＪ／ｍ２ｄ，两者之间的叶幕层温度差异很小，不显著。...     

棉田土壤水势与棉花关产量系的研究

本文根据灌溉量和产量的关系．确定了棉花优化灌溉的土壤水分临界值．结果表明：苗期土壤水势的下限和上限是36kPa和47kPa；蕾期土壤水势的上限和下限是26kPa和36kPa：铃期土壤水势的上限和下限是16kPa和41kPa；在吐絮期土壤水势的上限和下限是31kPa和52kPa。     

半干旱区草原地带优若黎和小叶锦鸡儿水分关系的研究

本文介绍了半干旱地区干草原地带天然灌木半灌木树种优若黎（Ｅｕｒｏｔｉａｃｅ－ｒａｔｏｉｄｅｓＬ．）和小叶绵鸡儿（ＣａｒａｇａｎａｍｉｃｒｏｐｈｙｌｌａＬ．）生长季的蒸腾速率、叶片扩散阻力、环境因子及叶水势的日进程，并按照土壤－植物－大气连续体理论，估算了土壤、植物、大气水势梯度。     

月季切花真空预冷水分损失与补充的研究

以‘红衣主教’月季切花为试材进行了真空预冷中防止失水的研究。比较了三种不同预冷终温（１０、５、２℃）和两种不同补水方式（茎基吸水和叶面喷水）对月季花枝水分状况及瓶插寿命的影响。真空预冷过程中的鲜重损失以茎基吸水处理最小；叶面喷水次之；不给水处理最大。花朵水势测定结果表明，真空预冷后茎基吸水处理为－０．３～－０．４ｍＰａ，与处理前相近；叶面喷水则显著降低；不给水处理最低。不同处理的瓶插寿命，茎基吸水     

干旱且无昼夜温差条件下玉米叶片ψW,ψS,ψP和叶片伸长速…

以盆栽玉米（掖单４号）幼苗为材料，在土壤缓慢干旱但无昼夜温差条件下，研究了叶片ψＷ，ψＳ，ψＰ和叶片伸长速度的昼夜变化，结果表明干旱条件下，白天叶片伸长速度大于夜间叶片伸长速度，白天叶基部ψ值高于夜间ψＰ值，白天叶基部的ψＰ值是ψＳ值增加（即渗透调节作用）所致。ψＰ值较高是白天叶片伸长速度较高的重要原因。     

干旱胁迫对针叶树苗木呼吸的影响

针叶树种的苗木受到土壤干旱胁迫时，暗呼吸速率随叶水势的下降而降低的趋势因树种不同而异。经测定白皮松降低幅度最大，其次是樟子松、油松和华山松，侧柏的下降幅度最小。