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| Effects of rainfall and salt layers on water and salt movement in coastal saline land |
| Yin Xiaolin,Ding Guodong,Zhang Weicheng |
| Beijing Forestry University, Key Lab. of Soil & Water Conservation and Desertification Combating of Ministry of Education, 100083, Beijing,China |
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Abstract In order to discover the effects of different salt layers on water and salt movement in coastal saline land, slag and sand were designed as salt layers in Fraxinus chinensis forests to compare and study the seasonal change rules of soil moisture and soil salinity at different depths. Results show that the soil moisture and salinity are affected by different factors at the surface and different depths of soil. At the surface, soil moisture and salinity are mainly affected by rainfall and evaporation, while at the lower depths, groundwater table is another affecting factor. In the rainy season, high intensity rainfall has great leaching function on the soil surface, but there is no obvious difference between two salt layers. However, for the soil at 30cm depth, the salt layers with slag and sand has a strong effect on inhibition of return effect of soil. The conductivity of salt layers decreased from 591ms/m in May to 493ms/m in October with slag and from 558ms/m down to 501ms/m with sand. For the soil at 60cm depth, the conductivity of salt layers decreased from 810ms/m in May to 582ms/m in October with slag and from 607ms/m to 560ms/m with sand. It is also found that the slag has better effect on inhibition of conductivity than sand.
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Received: 09 December 2010
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