虫食叶凋落物添加对土壤有机碳矿化及激发效应的影响OA北大核心CSTPCD
Effects of herbivory leaf litter addition on soil organic carbon mineralization and priming effect
植物叶凋落物输入是驱动土壤有机碳矿化的重要因子.以往有关凋落物输入对土壤有机碳矿化速率及激发效应的研究大多以健康叶凋落物为主,而针对虫食叶凋落的物理、化学质量是如何影响土壤有机碳矿化尚不清楚.以毛果青冈为研究对象,比较未虫食(NHL)、虫食(HL)、机械打孔(MDL)叶凋落物添加对土壤有机碳矿化及激发效应的影响.结果表明:与未添加凋落物处理(CK)相比,添加叶凋落物处理的土壤总CO2 释放累积量和土壤来源CO2 释放累积量均显著升高(P<0.05),呈正激发效应,激发效应为 133.7%~169.8%.与NHL处理相比,HL处理的土壤总CO2 释放速率和释放累积量、凋落物来源CO2 释放速率和释放累积量均显著提高(P<0.05),但NHL、HL处理的土壤来源CO2 释放及激发效应差异不显著.与MDL处理相比,HL处理的土壤总CO2 释放速率和释放累积量、土壤来源CO2 释放速率和释放累积量、激发效应均显著降低(P<0.05),但二者凋落物来源CO2 释放差异不显著.虫食引起的叶凋落物物理破碎化和化学质量改变共同调控土壤不同来源CO2 释放,提高亚热带森林虫害保护,降低虫害食叶将有助于提高森林碳汇.
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.
娄肖寒;陈子亮;应宇馨;胡亚林
福建农林大学林学院森林生态稳定同位素研究中心,福建 福州 350002
林学
虫食叶凋落物破碎化化学质量激发效应
herbivory leaf litterfragmentationchemical qualitypriming effect
《森林与环境学报》 2024 (005)
492-500 / 9
国家自然科学基金项目"昆虫食叶行为对亚热带典型常绿阔叶林叶凋落物分解及SOC周转的影响"(42077094).
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