不同沙生植被土壤微团聚体分形特征及抗蚀性

Anti-erodibility and Microaggregate Fractal Features of Soils Under Different Psammophytes

应用分形理论,以沙裸地为对照,不同沙生植被类型为研究对象,分析了不同沙生植被类型对土壤理化性质及抗蚀性的影响。结果表明,不同沙生植被中,踏郎土壤微团聚体组成和颗粒组成1～0.25 mm粒级含量较高;白柠条和踏郎的土壤微团聚体分形维数较低,且显著低于沙裸地。颗粒分形维数为沙蒿和踏郎较高,白柠条最低。沙裸地可蚀性K值最大,花棒和踏郎的可蚀性K值较小。综合分析表明沙裸地种植植被后,可以提高土壤质量和抗蚀性,其中踏郎较其它植被类型能更好地改善沙化土壤质量和提高土壤抗蚀性。

The study analyzed the effect of different vegetation on soil physicochemical properties and anti-erodibilty using the fractal theory.The results show that the soil under Hedysarum monglicum had a higher content of 1～0.25 mm soil microaggregates and particles than those under the other vegetations.Microaggregate factal dimensions of the soils under Caragana korshinkii and Hedysarum monglicum were lower than those under the other vegeataions,even significantly lower than that of bare sand.The highest particle dimensions were found in the soils under Artemisia desertorum and Hedysarum monglicum,and the lowest was in the soil under Caragana korshinki.Bare sand presented the highest erodibility value（K） while the soils under Hedysarum monglicum and Hedysarum scoparium had the lower ones.It can be concluded that the vegetation on bare sand could improve the soil quality and anti-erodibility,and Hedysarum monglicum could be the best choice as plant for improving soil quality according to the findings of this study.