Impacts of the soil pore structure on infiltration characteristics at the profile scale in the red soil region

被引:23
作者
Ju, Xinni [1 ,2 ,3 ]
Gao, Lei [1 ]
She, Dongli [2 ]
Jia, Yuhua [4 ]
Pang, Zhe [1 ,5 ]
Wang, Yaji [1 ]
机构
[1] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
[2] Chinese Acad Sci, Res Ctr Soil & Water Conservat & Ecol Environm, Minist Educ, Yangling 712100, Shaanxi, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Shenyang Agr Univ, Coll Water Conservancy, Key Lab Soil Eros Control & Ecol Restorat Liaoning, Shenyang 110866, Peoples R China
[5] Liaoning Prov Meteorol Serv Ctr, Shenyang 110866, Peoples R China
基金
中国国家自然科学基金;
关键词
Soil structure; Stable isotopes; Tracers; Land uses; Soil water replacement; PREFERENTIAL FLOW; LOESS PLATEAU; COMPUTED-TOMOGRAPHY; LAND USES; WATER; ISOTOPE; QUANTIFICATION; MACROPORES; DYNAMICS; HYDROGEN;
D O I
10.1016/j.still.2023.105922
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The complexity and uncertainty of pore structures, hinder the understanding of the water infiltration process along a soil profile. In this study, soil pore structures quantified by X-ray computed tomography (CT) scanning and infiltration processes traced using stable hydrogen and oxygen isotopes were linked under three land uses (forestland, citrus land, and rainfed cropland) in the red soil region of southern China. Our results showed that 95% of the soil pore diameters in the surface layer (0-20 cm) in forestland, citrus land, and rainfed cropland were concentrated in the ranges of 0.05-2.46, 0.05-2.24 and 0.05-1.04 mm, respectively. Rainfed cropland had the most soil micropores, along with a high porosity and poor connectivity, while there were more large, well-connected tubular pore channels in the forestland and citrus land. Hydrogen and oxygen stable isotopes were effective in tracing soil water infiltration processes under saturated and near-saturated conditions. The soil infiltration depths of citrus land, forestland, and rainfed cropland were 45, 40, and 25 cm, with "new water" volumes of 37.2, 26.4, and 22.3 mm, respectively. CT-based porosity and the soil texture were considered crucial indicators in the evaluation of the exchange between "old water" and "new water" during infiltration processes. More specifically, the soil structure of the limiting layer not only controlled the infiltration rate but also played an extremely important role in the infiltration mechanism, reflected by the different ratios of "new water". The soil pore characteristics mainly affected soil water transport, while other soil properties played more important roles in soil water retention.
引用
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页数:10
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