| Effect of vegetation recovery on desertification sand-fixing in high frigid region |
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| DOI：10.7606/j.issn.1000-7601.2006.06.22 |
| Key Words: Artificial vegetation Recovery Soil Sand-fixing |
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| Abstract: |
| Based on field sampling and lab analysis,this article studied the sand-fixing characteristic of different stages after vegetation recovery of desertificated land in high frigid region.The results showed that the formation of sand-fixing through resuming the artificial vegetation in the sandy area is the base of the dune fixing,in different time of the sand dune fixing,the characteristic of sand-fixing has a very obvious difference: ① With long time of fixing,the soil textures thinning.In the sand dune fixing process,the total content of sand grain tends to gradually reducing,the 1～0.25 mm sand grain content reduces gradually,the 0.25～0.05 mm sand grain content first increases and then reduces,but 0.05～0.02 mm sand grain content increases gradually,the silt and clay content increases at beginning,then stabilizes.② The chemical property becomes gradually superior.With long fixing time,the soil organic carbon,the fast-acting nutrient,the total nitrogen content and CEC gradually increase,these show that the sand-fixing have a function of intensely concentrating the soil nutrient;But the calcium carbonate and the pH value does not have extremely obvious changes.The increasing of organic matter promotes the reproduction of the soil microorganism,thus promotes the improvement of the activation of the soil enzyme. |
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