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采用安徽宣城农地、林地和荒地红壤,通过室内分析和培养实验,研究了不同利用方式下土壤微生物量碳含量及其与有机碳矿化动态的关系。结果表明,3种利用方式红壤的微生物量碳含量在表层最高,随土层加深明显递减;微生物量碳含量大小顺序是农地>林地>荒地;农地、林地和荒地红壤微生物量碳占有机碳比率分别为3.58%~5.34%、2.36%~4.52%和0.76%~1.83%;3种利用方式红壤的微生物量碳含量与有机碳含量均有显著或极显著的相关性。8周恒温培养过程中,红壤微生物量碳前4周上升,第3、4周达到峰值,随后下降;红壤有机碳矿化速率随培养时间的延长而下降;培养过程中土壤有机碳矿化速率与微生物量碳含量的关系可以很好地用二次多项式函数拟合。
Soil samples were collected from Xuancheng, Anhui Province. The indoor microbial biomass and its relationship with organic carbon mineralization under different utilization patterns were studied through laboratory analysis and cultivation experiments. The results showed that the microbial biomass carbon in the red soils was the highest in the three ways of utilization, and obviously decreased with the deepening of the soil layer. The order of the microbial biomass carbon content was farmland> forest land> wasteland; and in the red soil, Carbon ratio were 3.58% ~ 5.34%, 2.36% ~ 4.52% and 0.76% ~ 1.83%, respectively. There was a significant or significant correlation between microbial biomass carbon and organic carbon in the red soils under the three utilization patterns. During 8 weeks of incubation, soil microbial biomass carbon increased in the first 4 weeks and reached its peak at 3 and 4 weeks, then decreased. The rate of organic carbon mineralization in red soil decreased with the prolongation of incubation time. During the cultivation, the rate of soil organic carbon mineralization The relationship with microbial biomass carbon can be fitted well by a quadratic polynomial function.