EFFECT OF SOIL WATER POTENTIAL AND BULK DENSITY ON WATER UPTAKE PATTERNS AND RESISTANCE TO FLOW OF WATER IN WHEAT PLANTS
[摘要] Wateruptakepatternsofwheatplantswerestudiedinagrowthchamberbyusingtwosoilspackedtothreedifferentbulkdensities.Theresistancestowatermovementinthesoilandintheplantwerecalculatedfromthemathematicalmodelforwateruptakepublishedintheliterature.Whenthecapillarypotentialofthesoilswasnear−⅓bar,withdrawalofwaterbyplantswasrelativelysmallandmostofthewaterwastakenfromthetop25 cmofthesoilcolumn.Assoilwaterpotentialdecreased,wateruptakeincreasedprogressivelytowardthelowerpartofthesoilcolumn.Theresistancetowatermovementintheplantincreasedfromthetoptothebottomoftherootsystemandincreasedwithincreasingbulkdensityofthesoils.Forwetsoils,unrealisticvalueswereobtainedwhichcouldbeduetothefactthattheinteractionbetweenaerationandmoistureuptakeisnottakenintoaccountinthetheoreticalequationsformoistureuptake.
[发布日期] [发布机构]
[效力级别] [学科分类] 农业科学（综合）
[关键词] [时效性]
