川西北沙化草地植被恢复后土壤理化性质的变化

Changes of Soil Physical and Chemical Properties after Vegetation in Desertification Grassland, Northwest Sichuan, China

以植被恢复不同年限的川西北沙化草地土壤为对象,分析不同土层(0～20cm、20～40cm)中土壤理化性质的变化情况。结果表明:植被恢复对沙化草地土壤理化性质的改善有明显的促进作用;随植被恢复时间的延长,土壤容重逐渐减小,含水量显著提高;与参照样地相比,除土壤全K含量无明显变化外,土壤有机质、全N、全P以及速效养分含量在各层均呈不同程度的提高,表现最明显的是在土壤表层(0～20cm);相关分析说明,有机质含量和土壤容重表现出显著负相关(r=-0.533,p<0.05),而与土壤含水量呈极显著正相关(r=0.836,p<0.01),土壤有机质含量表现出和土壤全N、全P含量不同程度的正相关关系。

Aimed at the soil of desertification grassland with different restoration years, physical and chemical properties were analyzed for two soil layers （0 - 20cm, 20 - 40cm）. The results indicated that vegetation promoted the improvement of soil physical and chemical properties. With the vegetation restoration years increased, the contents of soil moisture increased obviously, but the soil bulk density decreased gradually; compared to the reference sample plot （CK）, the contents of soil organic matter, total N, total P and available nutrients in different layers increased by different degrees, especially in surface soil layer （0 - 20cm）, while total K not; correlation analysis revealed negative relationships between the soil organic matter and soil bulk density content （r=-0.533, p〈0.05）, however, there was significant positive relationships between the soil organic matter and soil moisture content （r=0.836, p〈0.01） , in addition to this, there was positive relationships between the content of soil total N, total P and the soil organic matter.