Effects of herbivory leaf litter addition on soil organic carbon mineralization and priming effect
Plant leaf litter is an important factor in controlling soil organic carbon(SOC)mineralization.Previous studies have mainly focused on the effects of healthy litter addition on the SOC mineralization rate and priming effect,but it is not well-known how changes in the physical and chemical properties of herbivory leaf litter affect SOC mineralization.In the present study,we compared the effects of non-herbivory(NHL),herbivory(HL),and mechanical damage(MDL)leaf litter of Quercus pachyloma on SOC mineralization and priming Q.pachyloma leaf litter.Our results showed that the total and soil-derived CO2emission accumulation increased after leaf litter addition compared to the control treatment without litter addition,and the positive priming effect ranged from 133.7%to 169.8%.Compared with the NHL treatment,the soil total CO2 emission rate and accumulation and litter-derived CO2 emission rate and accumulation were significantly increased under the HL treatment.However,there were no differences in the accumulation of soil-derived CO2 emissions or priming effects between the NHL and HL treatments.Compared with the MDL treatment,the soil total CO2 emission rate and accumulation,soil-derived CO2 emission rate and accumulation,and the priming effect significantly decreased under the HL treatment.However,there were no differences in litter-derived CO2 accumulation between the MDL and HL treatments.Our results imply that changes in the physical fragmentation and chemical quantity of herbivory leaf litter are the key factors regulating SOC mineralization and the priming effect.In the future,it will be necessary to strengthen the protection against forest pests and reduce tree-leaf herbivory to improve forest carbon sinks.
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