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为了解森林转化对土壤碳矿化过程的影响,采用室内培养法对川西亚高山3种典型森林(天然林、桦木次生林和云杉人工林)土壤碳矿化过程进行219 d的动态监测.结果表明,3种森林土壤碳矿化速率随培养时间增加而下降,矿化积累量随时间增加而增加,土壤有机层碳矿化速率和积累量均显著高于对应矿质土壤层;在土壤有机层,天然林和桦木次生林土壤碳矿化速率和积累量均显著高于云杉人工林,而在矿质土壤层3种森林无显著差异.培养结束时,3种森林有机层矿化积累量占总有机碳比值分别为11%、8%和11%,矿质土壤层分别为4%、6%和4%.森林群落、土壤层次和培养时间及三者交互作用对土壤碳矿化和积累量均有显著影响.土壤生物化学特性与土壤碳矿化率和积累量显著相关.单指数模型能很好地拟合土壤碳矿化特征.综上所述,森林转化对川西亚高山土壤碳矿化影响显著,主要表现在土壤有机层.
In order to understand the impact of forest conversion on soil carbon mineralization, the indoor culture method was used to monitor the soil carbon mineralization in three typical sub-alpine forests (natural forest, birch secondary forest and spruce plantation) for 219 days. The results showed that the carbon mineralization rate of three kinds of forest soils decreased with the increase of incubation time, and the accumulation of mineralization increased with the increase of time, and the rates of carbon mineralization and accumulation in soil organic layers were significantly higher than those in corresponding mineral soils. , The rates and accumulation of soil carbon mineralization in natural forest and birch secondary forest were significantly higher than those in spruce plantation, but no significant difference was found in the three kinds of forest in mineral soil layer.At the end of cultivation, Organic carbon ratios were 11%, 8% and 11%, respectively, while mineralized soil layers were 4%, 6% and 4% respectively. Both the forest community, the soil layer, the incubation time and the interaction of the three factors on soil carbon mineralization and accumulation Had a significant impact on the soil biochemical characteristics and soil carbon mineralization rate and accumulation of significant correlation.Single exponential model can well fit the characteristics of soil carbon mineralization.In conclusion, the forest conversion of sub-alpine mountain soil carbon mineralization Significant impact, Lord Performance in the organic layer of soil.