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Dynamic process and model simulation of soil water content during citrus growth period

Zhu Shijiang, Li Hu, Xu Wen, Zhang Tao, Liu Caihong, Peng Yuqiang

Acta Geophysica

2023

Vol. 71, no. 3

1525--1537

The change of soil water content in crop root system is the basis for the designing of water-saving irrigation scheduling. In order to explore the dynamic changes of soil water content, our study carried out long-term monitoring on the soil content at different depths in a typical citrus orchard. In this concern, water contents, salinities, and nitrate concentrations were measured weakly and were compared with the model predictions. One of the important perspectives is the growth restricting factor in the soil water, yield, and fruit quality of citrus. Combined with the meteorological data, the changing characters of soil water content and its responses to evapotranspiration and precipitation during the whole growth period were investigated. And then the changing process of soil moisture was simulated through the soil water balance model. The results showed that during the whole growth period of the citrus, the soil water content buried at 40 cm depth had the best correlation with that in the main active layer of citrus root system (0–60 cm), between which the correlation coefficient reached 0.988. Therefore, the depth of 40 cm could be used as the representative depth of soil water content monitoring. Under the combined effects of precipitation and evapotranspiration, soil depth could influence the changing process of soil water content, of which the effect weakened with the increase in depth. The water balance model within 1-week timescale was appropriate to simulate the changing process of soil water content.

Intercomparison of Surface Energy Fluxes Estimates from the FEST-EWB and TSEB Models over the Heterogeneous REFLEX 2012 Site (Barrax, Spain)

Corbari Ch., Timmermans W., Andreu A.

Acta Geophysica

2015

Vol. 63, no. 6

1609--1638

An intercomparison between the Energy Water Balance model (FEST-EWB) and the Two-Source Energy Balance model (TSEB) is performed over a heterogeneous agricultural area. TSEB is a residual model which uses Land Surface Temperature (LST) from remote sensing as a main input parameter so that energy fluxes are computed instantaneously at the time of data acquisition. FEST-EWB is a hydrological model that predicts soil moisture and the surface energy fluxes on a continuous basis. LST is then a modelled variable. Ground and remote sensing data from the Regional Experiments For Land-atmosphere Exchanges (REFLEX) campaign in 2012 in Barrax gave the opportunity to validate and compare spatially distributed energy fluxes. The output of both models matches the ground observations quite well. However, a spatial analysis reveals significant differences between the two approaches for latent and sensible heat fluxes over relatively small fields characterized by high heterogeneity in vegetation cover.