黄土高原不同土壤类型对桃树水分运转影响的模拟

根据不同土壤的水分特征曲线、气孔导度模型、冠层蒸腾模型和RC模型模拟出黄土高原不同土壤类型下桃树(Prunus persicavar.nectarina Maxim)的水分运转动态。在逐步干旱过程中各类土壤维持桃树蒸腾的时间和桃树散失的水分总量均依次为中壤土>轻壤土>紧砂土>重壤土,中壤土的保水能力最好,重壤土的可利用水最少,中壤土维持蒸腾的时间最长,但中壤土、轻壤土和紧砂土之间的保水能力与维持蒸腾的时间无显著差异。在整个干旱周期过程中气孔导度、叶片水势和组织贮存水均呈波动式减小,其总体趋势与土壤水势相一致。

Simulation of dynamic water transport in peach in different soil types in the Loess Plateau

Dynamic water transport in peach was simulated using curve of soil water characteristic for different soil types,stomatal conductance model,canopy transpiration model and RC model in the Loess Plateau.It is shown that normal transpiration duration and total water lose by peach in different soils are: medium loam>light loam>compact sand>heavy loam with gradual drought spell.Medium loam has the highest water preserving capability in creeping drought conditions and heavy loam has the least effective water,while the maximum peach transpiration duration is in the medium loam.There are,however,no observable differences in medium loam,light loam and compact sand.Stomatal conductance,leaf water potential and organic water storage exibit fluctuant decreasing trend in creeping drought periods similar to that of soil water potential.