淤积刺激下滨海湿地植物根系吸水及土壤水分变化

Stimulation of sediment deposition to root water uptake and soil water change in wetland near sea

基于HYDRUS-1D模型,研究滨海盐沼湿地中泥沙淤积和地下水位对滨海互花米草根系吸水及土壤水分变化的影响。结果表明:地下水位为0 cm时,泥沙淤积对土壤含水率沿土壤深度的分布无影响;地下水位为-14 cm时,互花米草根系生长的土壤含水率相对略低,受到泥沙淤积的轻微影响;地下水位为-28 cm和-42 cm时,泥沙淤积促进互花米草根系吸收土壤表层的水分,加快淤积层土壤水分的消耗,进而改善土壤淤积层的通气条件。在泥沙淤积刺激下,互花米草根系主要吸水区域往淤积层方向垂直上移。

Based on the HYDRUS-1 D model, the effects of sediment deposition and groundwater level on root water uptake and soil water change in Spartina alterniflora were studied. The results show that the sediment deposition has no effect on the distribution of soil water content along the depth when the groundwater level is 0 cm. When the groundwater level is-14 cm, the soil water content of the root system of the Spartina alterniflora is relatively low, and is slightly affected by sediment deposition. When the underground water level is-28 cm and-42 cm, the sediment deposition promotes the Spartina alterniflora root system to absorb moisture from the top of the soil, and quickens the consumption of soil water in silting layer, improving aeration condition of soil silting layer. Under the stimulation of sediment deposition, the main water absorbing area of the Spartina alterniflora root system moves vertically upward toward the deposition layer.