Importance of short-term temporal variability in soil physical properties for soil water modelling under different tillage practices

被引:15
作者
Geris, Josie [1 ]
Verrot, Lucile [1 ]
Gao, Lei [1 ,2 ]
Peng, Xinhua [2 ]
Oyesiku-Blakemore, Joseph [3 ]
Smith, Jo U. [3 ]
Hodson, Mark E. [4 ]
McKenzie, Blair M. [5 ]
Zhang, Ganlin [2 ]
Hallett, Paul D. [3 ]
机构
[1] Univ Aberdeen, Sch Geosci, Aberdeen AB24 3UF, Scotland
[2] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
[3] Univ Aberdeen, Sch Biol Sci, Aberdeen AB24 3UU, Scotland
[4] Univ York, Dept Environm & Geog, York YO10 5NG, N Yorkshire, England
[5] Univ Dundee, Geog & Environm Sci, Dundee DD1 4HN, Scotland
基金
英国自然环境研究理事会;
关键词
Soil water modelling; Temporal variability; Soil physical properties; Soil hydrology; PORE-SIZE DISTRIBUTION; HYDRAULIC CONDUCTIVITY; SPATIAL VARIABILITY; RETENTION; MOISTURE; HYSTERESIS; DYNAMICS; COMPACTION; TEXTURE; DENSITY;
D O I
10.1016/j.still.2021.105132
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Soil properties are often assumed to be static over time in hydrological studies, especially in hydrological modelling. Although it is well appreciated that soil structure and its impact on hydraulic properties are timevariable, particularly on cultivated land, very few studies have focused on quantifying the influence of such changes on soil hydrology, especially at the short term (i.e. seasonal). This study explored the value of incorporating such short-term time-variable soil properties in hydrological models. It is based on soil hydraulic properties from temporal field data under no-till done by direct seeding and under conventional cultivation done by ploughing to 0.2 m and harrowing. It uses a controlled tillage experiment in Scotland, on a soil with very good structural stability that experiences gentle rainfall in a temperate oceanic climate (Ko center dot ppen Cfb). Water retention data were collected from intact soil cores sampled at 0.025, 0.095 and 0.275 m depth at three times between April and August 2013; (i) immediately following tillage, (ii) at barley crop establishment 1 month later and (iii) after harvest. Soil structure varied over time, with no-till soils gaining porosity and ploughed soils losing porosity. We hypothesised that no-till soils would have less seasonal temporal variability, but found it to be comparable to ploughed soils, albeit with pore structure changes following different trends. These changes were reflected in Van Genuchten fitting parameters, which if accounted for in 1-D HYDRUS modelling, had a marked impact on modelled soil water content over time if contrasted to predictions assuming a static pore structure. Using data from multiple sampling events, as opposed to one sampling event, resulted in up to a 44 % difference in soil water content predictions and increased the temporal variability by a factor of 1.5. Hence, our results have demonstrated that it is important to account for short-term temporal variability in soil physical properties in soil water modelling studies, and should not be ignored as a default, particularly on cultivated agricultural soils.
引用
收藏
页数:10
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