摘要
对盆栽葡葡（Ｖｉｔｉｓ ｖｉｎｉｆｅｒａ Ｌ．）、苹果（Ｍａｌｕｓ ｐｕｍｉｌａ Ｍｉｌｌ）、山植（Ｃｒａｔａｅｇｕｓ ｐｉｎｎａｔｉｆｉｄａ Ｂｕｎｇｅ）和枣（Ｚｉｚｉｐｈｕｓｊｕｊｕｂａ Ｍｉｌｌ．）等４种果树水分胁迫条件下茎千直径微变化动态进行研究，结果表明：随着土壤相对含水量的降低，葡萄和苹果的茎于日最大收缩量减小，体内的贮藏水分利用量减少，属于贮藏水分经济利用型果树，而山楂和枣树的茎干日最大收缩量增大，体内贮藏水分利用量增加，属于贮藏水分高消费型果树。在于旱周期中，两种类型果树树体日蒸腾量的变化动态存在差异：贮藏水分经济利用型果树日蒸腾量随土壤相对含水量的降低呈持续下降的趋势，而贮藏水分高消费型果树仅在土壤相对含水量降低到某一临界值以下时，日蒸腾量才开始急剧减小。叶片气孔调节对土壤和植物体水分状况反应的差别是植物体贮藏水分利用方式产生差异的主要原因。
Continuous recordings of stem diameter microvariations during drought periods by micromorphometer were studied on four kinds of potted fruit trees,grape (Vins vinifera L. ),apple(Malus pumila Mill. ),Chinese hawthorn (Crataegus pinnatifida Bunge),and jujube (Ziziphus jujuba Mill. ). The stem maximum daily shrinkage (MDS) decreased with the reduction of relativesoil water content(RWC) in grape and apple trees,while increased rapidly in Chinese hawthornand jujube trees. The daily shrinkage intensity of the plant organs could imply the statUs of the tissue stored water usage at the moment in the plant,so that it may be suggested that grapes and apples belong to an economically consuming type of stored water,Chinese hawthorn and jujube treesto a prodigally consuming one. The daily transpiration evolution during a drought period variedwith the above types of stored water usage in the plant. The daily transpiration of the economicaltype decreased with the reduction of RWC,while the daily transpiration of the prodigal type reduced only after the RWC decreased to a critical level. The difference in stomatal regulation sponse to soil water status is the major factor controlling the stored water usage in the plant.
出处
《果树科学》
CSCD
北大核心
1999年第2期86-91,共6页
Journal of Fruit Science
基金
国家自然科学基金
关键词
果树
水分胁迫
茎干微变化
植物体贮藏水分
Fruit tree
Water stess
Stem diameter microvariation. Plant stored water
Stomatalregulation
