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| DOI：10.13522/j.cnki.ggps.2019222 |
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| The Effects of Grading and Thickness of Gravel Mulching on Water and Salt Movement in Soil under Brackish Water Irrigation |
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TAN Junli, WANG Xina， JIN Huijuan, DU Feifei, TIAN Juncang
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1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Engineering Research Center of the Ministry of Education for Modern Agricultural Water Resources High Efficiency in Arid Area, Yinchuan 750021, China;3. School of Agriculture, Ningxia University, Yinchuan 750021, China
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| Abstract: |
| 【Objectives】Gravel mulching is a technique commonly used in arid and semi-arid regions to reduce water evaporation from soil, and the grading and thickness of the gravel layer are two factors affecting soil moisture dynamics. The purpose of this paper is to investigate experimentally how irrigation with brackish water affects water and salt movement in soil mulched with gravel of different thicknesses and grading.【Method】The experiment was conducted in soil columns with their tops covered by a gravel layer with its grading ranging from coarse to fine sand, and thicknesses ranging from 0 (CK) to 15 cm. The experiment lasted one month, during which we measured soil water and salt distributions in the soil columns.【Result】The impact of gravel grading on moisture and salt distributions in the soil was insignificant, although the medium grading was less effective than the coarse and fine gradings in conserving soil water. The results also showed that gravel mulching increased soil moisture and reduced salt accumulation in the proximity of the soil surface, compared to not mulching, especially when the mulch was more than 10 cm thick. 【Conclusion】The effect of gravel grading on moisture and salt distribution in the soil was less than that of mulch thickness, and the gravel mulch could keep soil more moist and suppress salt accumulation in the proximity of the soil surface even when the mulch was 5 cm thick. |
| Key words: gravel mulching; brackish water; thickness of gravel; gravel grading; moisture and salt distribution |
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