喀斯特森林自然恢复中土壤微生物生物量碳与水溶性有机碳特征

Characteristics of soil microbial biomass carbon and soil water soluble organic carbon in the process of natural restoration of Karst forest

2011年9月,采用空间代替时间方法,研究了贵州茂兰国家级自然保护区退化喀斯特森林自然恢复中土壤微生物生物量碳和水溶性有机碳特征.结果表明:研究期间,土壤微生物生物量碳含量、基础呼吸随土壤深度增加而减少,随自然恢复的进程而增加;微生物熵随土壤深度增加和恢复的进程增加;水溶性有机碳含量随土壤深度增加而减少,随自然恢复的进程表层土增加,下层先增加后减少;水溶性有机碳与有机碳的比值随土壤深度增加而增加,随自然恢复的进程而减少;土壤质量、有机碳的质与量随自然恢复的进程而提高,其中微生物量碳变化最大,而水溶性有机碳变化不显著.

By the method of taking space instead of time,an incubation test was conducted to study the characteristics of soil microbial biomass carbon and water soluble organic carbon in the process of natural restoration of Karst forest in Maolan Nature Reserve,Guizhou Province of Southwest China.The soil microbial biomass carbon content and soil basal respiration decreased with increasing soil depth but increased with the process of the natural restoration,soil microbial quotient increased with increasing soil depth and with the process of restoration,and soil water soluble organic carbon content decreased with increasing soil depth.In the process of the natural restoration,surface soil water soluble organic carbon content increased,while sublayer soil water soluble organic carbon content decreased after an initial increase.The ratio of soil water soluble organic carbon to total soil organic carbon increased with increasing soil depth but decreased with the process of restoration.Soil quality increased with the process of restoration.Also,the quality and quantity of soil organic carbon increased with the process of restoration,in which,soil microbial biomass carbon content had the greatest change,while soil water soluble organic carbon content had less change.