植物器官体积变化连续测微法指导果树自动化灌溉合理指标的研究Rational Parameter for Irrigation Scheduling Automation Used in Fruit Trees by Micromorphometric Method
李绍华,余克顺,孟昭清,罗国光
摘要(Abstract):
对盆栽葡萄(VitisviniferaL.)、苹果(MaluspumilaMill.)、山楂(CrataeguspinnatifidsBunge)和枣(ZiziphusjnyubaMill.)4种果树在不同水分营养状况下茎于微变化过程中的日最大收缩量(MDS)、日净增长量(DG)、当日完全复原所需时间(RT)等3个重要指标进行研究,结果表明:3个指标都比叶片日出前水势对土壤水分营养状况的反应灵敏得多;随着土壤可利用水分的不断减少,山楂和枣的MDS急剧增加,而葡萄和苹果的MDS减小,不同类型果树之间的反应不一致;在土壤水分状况较好时,4种果树的DG的变化平缓,变化幅度较小;在良好的土壤水分条件下,4种果树的RT随着土壤相对持水量的下降而迅速延长,并在土壤水分含量降低到一临界值以下时维持在24h。因此,在应用植物器官体积变化连续测微法指导果树灌溉时,MDS和DG并不适于单独作为所有果树的自动化灌溉指标,而RT作为果树自动化灌溉指标较为理想。
关键词(KeyWords): 果树;植物器官体积变化连续测微法;水分胁迫;自动化灌溉
基金项目(Foundation): 国家自然科学基金
作者(Author): 李绍华,余克顺,孟昭清,罗国光
Email:
DOI: 10.13925/j.cnki.gsxb.1999.03.002
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