Foliage C:N ratio, stage of organic matter decomposition and interaction with soil affect microbial respiration and its response to C and N addition more than C:N changes during decomposition

0531840 - BC 2021 RIV NL eng J - Článek v odborném periodiku
Jílková, Veronika - Straková, P. - Frouz, Jan
Foliage C:N ratio, stage of organic matter decomposition and interaction with soil affect microbial respiration and its response to C and N addition more than C:N changes during decomposition.
Applied Soil Ecology. Roč. 152, August (2020), č. článku 103568. ISSN 0929-1393. E-ISSN 1873-0272
Grant CEP: GA ČR(CZ) GA18-24138S; GA MŠMT(CZ) LM2015075; GA MŠMT(CZ) EF16_013/0001782
Grant ostatní: AV ČR(CZ) L200961602
Institucionální podpora: RVO:60077344
Klíčová slova: carbon dioxide * heavy fraction * light fraction * litter * nutrients * spoil heaps
Obor OECD: Ecology
Impakt faktor: 4.046, rok: 2020
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/abs/pii/S0929139319313459?via%3Dihub

How litter at various stages of decomposition reacts to C and N additions is unclear. Here we used five substrates (litter, fermentation [Oe] layer, bulk soil, and the light fraction [LF] and heavy fraction [HF] of SOM) obtained from sites supporting five plant monocultures (Alnus glutinosa, Quercus robur, Salix caprea, Calamagrostis epigejos, or Picea omorica) with foliage C:N ratios ranging from 17 to 48. These plant-specific communities were experimentally planted on a post-mining heap and had affected the substrates used in this study for 40 years. Soils and other environmental factors were similar among the sites. Substrates were incubated for 3 weeks without nutrient addition or with C (glucose) or N (ammonium nitrate) addition, and microbial respiration was determined weekly. Substrate C:N ratios were determined at the start of the incubation and were highest for litter followed by Oe layer > LF > bulk soil and HF. Foliage C:N ratio was a better indicator of microbial respiration than the substrate C:N ratio, suggesting that the foliage C:N ratio reflected unmeasured leaf properties that determined microbial respiration. Respiration was highest in the litter followed by Oe layer > bulk soil > LF > HF. C addition increased respiration of the bulk soil (+39%), LF (+48%), and HF (+72%). Priming of SOM respiration was therefore higher in substrates with less available C. N significantly increased respiration of litter (+19%) but decreased respiration of bulk soil (−18%). The difference in respiration of HF vs. bulk soil following N addition suggested that, in addition to the stage of decomposition, environmental properties present in bulk soil but absent in HF may cause the reduction in respiration after N addition to bulk soil. Overall, the results indicate that differences in the contents of SOM fractions among soils will affect the responses of those soils to C and N additions.
Trvalý link: http://hdl.handle.net/11104/0310490