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| DOI：10.13522/j.cnki.ggps.2017.0505 |
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| Water Retention Characteristics of Typical Soils in Southwestern Guizhou Province |
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YANG Xu， ZHAO Tingchao, WANG Feng, SHAO Xiaohou, GUO Yali, LI Minhui,CHANG Tingting, GUANG Jianfang, WU Wenbo
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Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-water Environment in Southern China, Ministry of Education(Hohai University), Nanjing 210098, China;College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098 China; Tobacco Company of Qianxinan Prefecture, Xingyi 562400, China
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| Abstract: |
| 【Objective】 Water retention characteristics is a soil quality indicator, and this paper presents the water retention curves measured from typical soils in southwestern Guizhou Province. 【Method】 Soil samples from 0~60 cm were taken from tobacco fields and their water retention curves were measured in laboratory using pressure membrane apparatus. 【Result】 All measured water release curves can be fitted to the Gardner formula but the model parameters varied. Overall, the water-holding capacity of the subsoil is higher than that of the top soil. For soils in Xingyi, Zhenfeng Anlong and Puan, their water-holding capacity at different depths was ranked in 40~60 cm>20~40 cm>0~20 cm, while for soils in Qinglong and Xingren, it was in the order of 20~40 cm>40~60 cm>0~20 cm. Spatially, the water holding capacity of soils in 0~20 cm and 20~40 cm ranked in Xingyi>Anlong>Qinglong>Zhenfeng>Puan>Xingren, while of the soil in 40~60 cm was order in Xingyi>Anlong>Qinglong>Xingren>Zhenfeng>Puan. 【Conclusion】 The water retention characteristics are spatially variable and the results presented in this paper can be used as refences in designing irrigation schedules for this region. |
| Key words: southwestern Guizhou Province; Gardner formula; water conservation and drought resistance; soil water retention curves; soil water holding characteristics |
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