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Why We Should Include Soil Structural Dynamics of Agricultural Soils in Hydrological Models

1
Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES), United Nations University, Ammonstraße 74, 01067 Dresden, Germany
2
Institute of Soil Science and Site Ecology, Technische Universität Dresden, Pienner Straße 19, 01737 Tharandt, Germany
3
Institute of Hydraulics and Rural Water Management, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria
*
Authors to whom correspondence should be addressed.
Water 2018, 10(12), 1862; https://doi.org/10.3390/w10121862
Received: 22 November 2018 / Revised: 11 December 2018 / Accepted: 13 December 2018 / Published: 15 December 2018
(This article belongs to the Special Issue Soil Hydrology in Agriculture)
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Abstract

Surface soil structure is sensitive to natural and anthropogenic impacts that alter soil hydraulic properties (SHP). These alterations have distinct consequences on the water cycle. In this review, we summarized published findings on the quantitative effects of different agricultural management practices on SHP and the subsequent response of the water balance components. Generally, immediately after tillage, soils show a high abundance of large pores, which are temporally unstable and collapse due to environmental factors like rainfall. Nevertheless, most hydrological modeling studies consider SHP as temporally constant when predicting the flow of water and solutes in the atmosphere-plant-soil system. There have been some developments in mathematical approaches to capture the temporal dynamics of soil pore space. We applied one such pore evolution model to two datasets to evaluate its suitability to predict soil pore space dynamics after disturbance. Lack of knowledge on how dispersion of pore size distribution behaves after tillage may have led to over-estimation of some values predicted by the model. Nevertheless, we found that the model predicted the evolution of soil pore space reasonably well (r2 > 0.80 in most cases). The limiting factor to efficiently calibrate and apply such modeling tools is not in the theoretical part but rather the lack of adequate soil structural and hydrologic data. View Full-Text
Keywords: temporal dynamics; soil hydraulic properties; soil structure; tillage effects; pore size distribution temporal dynamics; soil hydraulic properties; soil structure; tillage effects; pore size distribution
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Chandrasekhar, P.; Kreiselmeier, J.; Schwen, A.; Weninger, T.; Julich, S.; Feger, K.-H.; Schwärzel, K. Why We Should Include Soil Structural Dynamics of Agricultural Soils in Hydrological Models. Water 2018, 10, 1862.

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