Characteristics of soil moisture growth and decline in sandy land under root irrigation
DU Hulin1,2*, LIU Junjiang3, LIU Rongguo3, MA Zhenyong1,4, LIU Ligang3, WANG Yongjun3, ZHU Rui3, ZHANG Bo3, NIU Jinshuai3
1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China; 2.Key Laboratory of Ecohydrology of Inland River Basin, CAS, Lanzhou, Gansu 73000, China; 3.Ningxia Zhongwei Shapotou National Nature Reserve Administration, Zhongwei, Ningxia 755700, China; 4.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:Irrigation experiments were conducted on artificially planted annual Halotylon ammodendron in the Sapotou Environment Protection Ecological Demonstration Base in Zhongwei of Ningxia by using a straight-inserting root irrigation technique. Soil water variations in 20-100 cm soil layer were observed continuously in 24 h by TDR probe. The characteristics of soil water increase and depletion are as follows: soil water increase can be divided into two stages, the initial 6 h after irrigation is a rapid increase stage with an increase rate of 55.36%/h. Following that there is a slow increase stage with an increase rate of 0.57%/h, i.e. just 1.03% of the rate in the first stage. Soil water depletion can be divided into two stages: the initial 6-8 h after stopping irrigation is a rapid soil water depletion stage with a depletion rate of 7.58%/h. Then there is a slow depletion stage with a depletion rate of 0.58%/h, and the soil water depletion period is 5 d. The minimum threshold of soil water deflation is 1.45%, which is of great significance to artificial plant growth in Shapotou, because the soil moisture content is 1.45% -4.0% in that area. The soil water depletion processes can be best fitted by a power function equation. In 20 cm depth shallow surface soil layer, soil moisture of straight-tube root irrigation is 170% higher than that of surface drip irrigation. The effective water holding time of straight-tube root irrigation is 12 times the surface drip irrigation. Straight-tube root irrigation has better soil moisture conservation than surface drip irrigation.
杜虎林,*, 刘俊江, 刘荣国, 马振勇、, 刘立刚, 王永军, 朱睿, 张波, 牛金帅. 根灌条件下沙地土壤水分消长变化特征[J]. 排灌机械工程学报, 2018, 36(7): 617-624.
DU Hulin,*, LIU Junjiang, LIU Rongguo, MA Zhenyong,, LIU Ligang, WANG Yongjun, ZHU Rui, ZHANG Bo, NIU Jinshuai. Characteristics of soil moisture growth and decline in sandy land under root irrigation. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(7): 617-624.
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