Monoterpenes(MTs)play crucial roles not only in atmospheric chemistry and global climate change but also in soil processes and soil ecology.Elevated nitrogen(N)deposition can influence soil microbial community and lit...Monoterpenes(MTs)play crucial roles not only in atmospheric chemistry and global climate change but also in soil processes and soil ecology.Elevated nitrogen(N)deposition can influence soil microbial community and litter decomposition,and consequently alters MT fluxes from forest floors and litter.Yet,the responses of soil and litter MT to increased N deposition remain poorly understood and the influences of N addition are sometimes contradictory.In the present study,static chambers were placed in masson pine forest(PF)and in monsoon evergreen broad-leaf forest(BF)at Dinghushan,subtropical China.The preconcentrator-GC–MS was used to analyze the effect of N addition on MT fluxes from the forest floors and litter.The results showed that under control treatment(without N addition),the total MT emission rates were 279.90±137.17 and 102.70±45.36 pmol m^(–2)s^(–1) in the PF and BF floors,respectively,withα-pinene being the largest MT species in the PF and limonene in the BF.α-pinene andβ-pinene emission rates decreased significantly in both forest floors after N addition,whereas a diverse trend was found for limonene and camphene in the PF floor.Furthermore,some MT fluxes showed significant negative correlations with soil respiration and soil temperature.Litter was important in MT fluxes from forest floors and its emission rates were enhanced by N addition.Moreover,different MT response to elevated N was found between the forest floor and litter.This study indicated that the elevated N deposition in the future would inhibit the MT emissions from the subtropical forest floor.展开更多
基金the National Natural Science Foundation of China(Grant Nos.41877326 and 41473083)。
文摘Monoterpenes(MTs)play crucial roles not only in atmospheric chemistry and global climate change but also in soil processes and soil ecology.Elevated nitrogen(N)deposition can influence soil microbial community and litter decomposition,and consequently alters MT fluxes from forest floors and litter.Yet,the responses of soil and litter MT to increased N deposition remain poorly understood and the influences of N addition are sometimes contradictory.In the present study,static chambers were placed in masson pine forest(PF)and in monsoon evergreen broad-leaf forest(BF)at Dinghushan,subtropical China.The preconcentrator-GC–MS was used to analyze the effect of N addition on MT fluxes from the forest floors and litter.The results showed that under control treatment(without N addition),the total MT emission rates were 279.90±137.17 and 102.70±45.36 pmol m^(–2)s^(–1) in the PF and BF floors,respectively,withα-pinene being the largest MT species in the PF and limonene in the BF.α-pinene andβ-pinene emission rates decreased significantly in both forest floors after N addition,whereas a diverse trend was found for limonene and camphene in the PF floor.Furthermore,some MT fluxes showed significant negative correlations with soil respiration and soil temperature.Litter was important in MT fluxes from forest floors and its emission rates were enhanced by N addition.Moreover,different MT response to elevated N was found between the forest floor and litter.This study indicated that the elevated N deposition in the future would inhibit the MT emissions from the subtropical forest floor.
