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Decomposition of labile and recalcitrant coniferous litter fractions affected by temperature during.the g.owing.season

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Journal of Forestry Research 2020年第4期31卷 1115-1121页

作者： Veronika Jílková Kristyna Dufková Tomás Cajthaml Na Sádkách 7CeskéBudějovice 37005Czech Republic Faculty of Science Masaryk UniversityKotlárská267/2Brno 61137Czech Republic Institute for Environmental Studies Charles University in PragueBenátská2Prague 12801Czech Republic Institute of Microbiolog. Czech Academy of SciencesVídeňská1083Prague 14220Czech Republic

Temperate coniferous forest soils are considered important sinks of soil org.nic carbon(C).Fresh C inputs may,however,affect soil microbial activity,leading.to increased org.nic matter decomposition and carbon dioxide *** consists of labile and recalcitrant fractions which are thoug.t to be utilized by distinct microbial communities and at different rates during.the g.owing.*** this study,we incubated the whole litter(LC+RC),the labile(LC)and the recalcitrant(RC)fractions with the coniferous soil at two temperatures representing.spring.autumn(10℃)and summer(20℃)for one *** respiration and microbial community composition were reg.larly determined using.phospholipid fatty acids as *** LC fraction g.eatly increased soil respiration at the beg.nning.of the incubation period but this effect was rather *** effect of the RC fraction persisted long.r and,tog.ther with the LC+RC fraction,respiration increased during.the whole incubation *** of the RC fraction was more strong.y affected by hig.er temperatures than decomposition of the more labile fractions(LC and LC+RC).However,when we consider the relative increase in soil respiration compared to the dH2 O treatment,respiration increased more at a lower temperature,sug.esting.that available C is more important for microbial metabolism at lower *** C was added only once in our study,no chang.s in microbial community composition were detected,possibly because the microbial community is adapted to relatively low amounts of additional C such as the amounts naturally found in litter.

关键词： Temperate forest Picea abies Soil respiration Hot water-extractable carbon PLFA (phospholipid fatty acids)

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