| Autor: |
Maaroufi NI; Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, SE-901 83, Umeå, Sweden. Nadia.Maaroufi@slu.se.; Department of Ecology, Swedish University of Agriculture Sciences, SE-750 07, Uppsala, Sweden. Nadia.Maaroufi@slu.se., Nordin A; Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden., Palmqvist K; Department of Ecology and Environmental Science, Umeå University, SE-901 87, Umeå, Sweden., Gundale MJ; Department of Forest Ecology and Management, Swedish University of Agriculture Sciences, SE-901 83, Umeå, Sweden. |
| Abstrakt: |
In nitrogen (N) limited boreal forests, N enrichment can impact litter decomposition by affecting litter quality and by changing the soil environment where litter decomposes. We investigated the importance of litter quality and soil factors on litter decomposition using a 2-year reciprocal transplant experiment for Picea abies needle litter, derived from plots subjected to 17 years of N addition, including control, low and high N treatments (ambient, 12.5 and 50 kg N ha -1 yr -1 , respectively). Our data show that changes in soil factors were the main pathway through which N impacted litter decomposition, with rates reduced by ~15% when placed in high N relative to control plots, regardless of litter origin. Litter decomposition was correlated to soil microbiota, with Picea abies litter decomposition positively correlated with gram negative and fungal functional groups. Our results suggest that previous findings of increase soil C accumulation in response to N deposition is likely to occur as a result of changes in soil microbiota rather than altered litter quality. |
