不同植被恢复措施下退化灌草丛草地土壤理化性状的评价*

 以土壤有机质、全氮、全磷、全钾、碱解氮、速效磷、速效钾、pH值、容重、孔隙度和含水量等为指标，对云南省马龙县不同植被恢复措施下的退化灌草丛草地的土壤理化性状进行主成分分析和聚类评价。结果表明：浅耕翻+补播和自然封育措施综合得分较高，表明对土壤改良效果明显；植被重建措施综合得分较低，尤其在重度退化样地，其植被重建措施综合得分最低，表明在云南省马龙县特定条件下，重度退化草地不适于采用全垦改良措施，自然封育或浅耕翻+补播有利于退化草地土壤质量的恢复。

Evaluation on the Soil Physical and Chemical Charactenristics of Degraded Shrub-Grass Grasslands by Different Vegetation Restoration Measures

In Malong County,Yunnan Province,the degraded shrub-grass grasslands were improved by reseeding,enclosure and reconstruction in the year of 2004.The soil physical and chemical characteristics such as soil organic matter,total nitriogen(N),total phosphor(P),total kalium(K),available N,available P,available K,pH value,bulk density,total porosity,and water content were analyzed by principal component analysis and cluster analysis in 2006.The results showed that the synthetical scores of reseeding and enclosure measures were higher,which indicated that the reseeding and enclosure measures were obviously efficient to soil improvement.The method of reconstruction showed a lower synthetical score,especially in the severe degradation grassland whose score was the lowest,which showed that the reconstruction was not suitable to improve the severe degradation grassland.The measures of reseeding and enclosure are beneficial to restoration of the soil quality of degraded shrub-grass grasslands.