葡萄根系分区交替滴灌的土壤水分动态模拟

在根系分区交替滴灌土壤水分动态和根系分布试验观测的基础上,提出了葡萄二维根系吸水模型,并确定了与土壤表层含水率有关的棵间土壤蒸发方程,然后在土壤水分运动基本方程的基础上结合交替滴灌的入渗特性,建立了根系分区交替滴灌的土壤水分动态模型(APRI-Model),模型考虑了该种灌水方式下棵间土壤蒸发和根系吸水的变化特征。通过与田间实测值进行比较,结果表明,模型的均方差在0.01~0.022cm3/cm3范围内,模拟值与实测值的平均相对误差在10%左右,因此,认为模型能很好的模拟干旱区蒸发力较大和作物根系分布不均匀条件下的土壤水分动态。

Simulation of soil water dynamics under alternately partial root zone drip irrigation for grape roots

Based on the observed data of the alternately partial root zone drip irrigation and the root distribution of grape,a two-dimensional root water uptake model and function of soil evaporation related to soil water content were proposed.Combining with infiltration characteristics,a soil water dynamic model describing the alternately partial root zone drip irrigation(APRI model) was developed.The comparison of simulated soil water contents with field measurement data shows that the root-mean-square-error is ranging from 0.010 to 0.022 cm~3/cm~3,and the average relative error of soil water content is about 10%.It can be concluded that APRI-model performs well in simulating soil moisture dynamics under the alternately partial root zone drip irrigation in the arid region with great soil evaporation and uneven root distribution.