SOIL WATER DYNAMICS OF CROPLANDS AND ORCHARDS AFTER LAND RECLAMATION IN THE WEIBEI AREA, NORTHWEST CHINA

This paper focuses on numerical modelling of soil water movement in response to the root water uptake that is driven by transpiration. The flow of water in a lysimeter, installed at a grass covered hillslope site in a small headwater catchment, is analysed by means of numerical simulation. The lysimeter system provides a well defined control volume with boundary fluxes measured and soil water pressure continuously monitored. The evapotranspiration intensity is estimated by the Penman-Monteith method and compared with the measured lysimeter soil water loss and the simulated root water uptake. Variably saturated flow of water in the lysimeter is simulated using one-dimensional dual-permeability model based on the numerical solution of the Richards’ equation. The availability of water for the root water uptake is determined by the evaluation of the plant water stress function, integrated in the soil water flow model. Different lower boundary conditions are tested to compare the soil water dynamics inside and outside the lysimeter. Special attention is paid to the possible influence of the preferential flow effects on the lysimeter soil water balance. The adopted modelling approach provides a useful and flexible framework for numerical analysis of soil water dynamics in response to the plant transpiration.

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Monitoring and modelling soil water dynamics using electromagnetic conductivity imaging and the ensemble Kalman filter

Geoderma ◽

10.1016/j.geoderma.2016.09.027 ◽

2017 ◽

Vol 285 ◽

pp. 76-93 ◽

Cited By ~ 28

Author(s):

Jingyi Huang ◽

Alex B. McBratney ◽

Budiman Minasny ◽

John Triantafilis

Keyword(s):

Kalman Filter ◽

Soil Water ◽

Ensemble Kalman Filter ◽

Water Dynamics ◽

Soil Water Dynamics ◽

Conductivity Imaging

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SIMULATION OF SOIL WATER DYNAMICS IN LAYERED SOILS

Soil Science ◽

10.1097/00010694-197701000-00007 ◽

1977 ◽

Vol 123 (1) ◽

pp. 54-62 ◽

Cited By ~ 23

Author(s):

D. HILLEL ◽

H. TALPAZ

Keyword(s):

Soil Water ◽

Water Dynamics ◽

Layered Soils ◽

Soil Water Dynamics

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Soil water dynamics after fire in a Portuguese shrubland

International Journal of Wildland Fire ◽

10.1071/wf04057 ◽

2006 ◽

Vol 15 (1) ◽

pp. 99 ◽

Cited By ~ 25

Author(s):

Joaquim S. Silva ◽

Francisco C. Rego ◽

Stefano Mazzoleni

Keyword(s):

Water Content ◽

Soil Water ◽

Plant Community ◽

Root Distribution ◽

Control Plot ◽

The Other ◽

Water Dynamics ◽

Soil Water Dynamics ◽

Surface Layers ◽

Before And After

This paper presents a study where soil water content (SW) was measured before and after an experimental fire in a shrubland dominated by Erica scoparia L. in Portugal. Two plots were established: one was kept as a control plot and the other was burned by an experimental fire in June 2001. Measurements were taken before fire (2000), and after fire (2001, 2002, and 2003) at six depths down to 170 cm, from June to December. Measurements before fire allowed comparison of the two plots in terms of the SW differential, using 2000 as a reference. Results for 2001 showed that SW decreased less during the drying season (June–September) and increased more during the wetting season (October–December) in the burned plot than in the control plot. The magnitude of these effects decreased consistently in 2002 and 2003, especially at surface layers. The maximum gain of SW for the total profile in the burned plot was estimated as 105.5 mm in 2001, 70.2 mm in 2002, and 35.6 mm in 2003. The present paper discusses the mechanisms responsible for the increase in SW taking into account the characteristics of the plant community, including the root distribution, and the results of other studies.

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