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| 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 |
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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.
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Received: 12 June 2017
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