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以典型喀斯特地区植被恢复过程中不同恢复阶段(退耕地阶段、草本阶段、灌木阶段、乔木阶段)为对象,研究了土壤养分、微生物量磷、碱性磷酸酶活性等土壤性质的变化及其相关性。结果表明,灌木地土壤有机质、全N、全P和水解性N均高于草地,但低于退耕地;乔木地除10-20 cm有机质和0-10 cm速效K显著高于灌木地外,其它与灌木地无显著差异。土壤微生物量磷和碱性磷酸酶活性从退耕地到草地降低,从草地到灌木升高。而灌木到乔木阶段,土壤微生物量磷表现为降低,碱性磷酸酶活性则趋于稳定。退耕地、乔木和灌木之间碱性磷酸酶活性无显著差异,但草地碱性磷酸酶活性显著低于其它3种类型样地。土壤养分含量、微生物量磷含量和碱性磷酸酶活性均随土壤深度的增加而降低。相关分析表明,土壤微生物量磷与有机质、全N、水解性N和速效K含量之间呈极显著正相关(P<0.01),与pH值呈显著负相关(P<0.05);碱性磷酸酶与土壤有机质、全N、水解性N、全P、速效K和微生物量磷呈极显著正相关(P<0.01)。
The changes of soil properties, such as soil nutrients, microbial biomass phosphorus and alkaline phosphatase activity, and their correlations were studied in different restoration stages (returning farmland, herbaceous stage, shrub stage and arbor stage) during the process of vegetation restoration in a typical karst area Sex. The results showed that soil organic matter, total N, total P and hydrolyzable N of shrubland were higher than that of grassland, but lower than that of farmland. Except for 10-20 cm of organic matter and 0-10 cm of available K in shrub land, No significant difference with other shrubs. Soil microbial biomass phosphorus and alkaline phosphatase activity decreased from the farmland to the grassland and from the grassland to the shrubs. In shrub stage, the soil microbial biomass P decreased and alkaline phosphatase activity tended to be stable. There was no significant difference in alkaline phosphatase activity between trees and shrubs in the returned farmland, but the activity of alkaline phosphatase in grassland was significantly lower than the other three types of plots. Soil nutrient content, microbial biomass P and alkaline phosphatase activities decreased with soil depth. Correlation analysis showed that there was a significant positive correlation (P <0.01) between soil microbial biomass phosphorus and organic matter, total N, hydrolyzable N and available K, and significant negative correlation with pH (P <0.05) There was a significant positive correlation between enzyme and soil organic matter, total N, hydrolyzable N, total P, available K and microbial biomass phosphorus (P <0.01).