贵州中部喀斯特森林退化过程中土壤酶活性的变化

Change of Soil Enzyme Activity during the Process of Karst Forest Degradation in Central Region of Guizhou

为给喀斯特环境脆弱生态系统的植被恢复提供理论依据,对贵州中部喀斯特森林退化过程中土壤酶活性的变化及其与土壤养分含量的相关关系进行了研究。结果表明,喀斯特森林从原生林→次生林→灌木林→灌草丛方向的演替过程中,土壤pH由中性偏向微碱性,土壤有机质、碱解氮、有效磷含量明显下降,土壤脲酶、过氧化氢酶和碱性磷酸酶活性也明显下降,而土壤蛋白酶和蔗糖酶活性变化不明显;与原生林地相比,灌丛草地的土壤脲酶活性、过氧化氢酶活性、碱性磷酸酶活性分别下降了60%、38%、43%。

The change of soil enzyme activity and relationship between enzyme activity and soil nutrient content during the process of forest degradation were studied to provide the theoretical basis for revegetation in Karst region with the frail ecosystem. The results showed that the soil pH was from neutrality to slightly alkalinity during the process degradation of Karst forest from original forest to secondary forest to bush forest to bush-grass land, and soil organic matter, alkalysis N, available P and activity of soil urease, peroxidase and alkalin phosphatase decreased obviously but the activity of proteinase and invertase was no difference. The activity of urease, peroxidase and alkalin phosphatase in low-growing bush soil decreased by 60%, 38% and 43% compared with virgin forest.