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• W3048948032 abstract "Abstract Coniferous and deciduous trees growing in pure and mixed forests likely shape microbial communities via the difference in the supply of litter- and root-derived resources. However, effects of forest types including non-native tree species on microbial communities and their variation with site conditions remain poorly understood. We combined physiological and community approaches, and investigated microbial basal respiration, microbial biomass and phospholipid-derived fatty acids (PLFAs) in the litter and soil at four nutrient-rich and four nutrient-poor sites in Lower Saxony, Germany. At each of the eight sites, five types of forest were studied, including pure stands of European beech (Fagus sylvatica), Norway spruce (Picea abies) and Douglas-fir (Pseudotsuga menziesii), as well as mixed species stands of beech and spruce, and beech and Douglas-fir, i.e., 40 forest plots. Forest type only affected soil microorganisms at nutrient-poor sites, but not at nutrient-rich sites. At nutrient-poor sites, conifer pure- and mixed-forests had lower microbial basal respiration and biomass, and were more stressed compared to beech forests. The detrimental effects of Douglas-fir on microorganisms were particularly strong compared to beech in litter and in soil at nutrient-poor sites. By contrast, beech forests at nutrient-poor sites were less limited of labile carbon compounds than conifer pure- and mixed-forests, likely due to its high root-derived resources. These results indicate that long-term effects of planting exotic tree species such as Douglas-fir on ecosystem functioning need further attention in particular at nutrient-poor sites. Whereas planting Douglas-fir in pure or mixed stands at large spatial scale should be cautious, planting Douglas-fir at nutrient-rich sites appear of little concern from the perspective of microbial communities. Overall, the results highlight the potential importance of root-derived resources in determining microbial community structure and functioning, and document the sensitivity of soil microorganisms to planting non-native tree species differing in the provisioning of these resources from native species. Highlights *Forest type effects on microorganisms only occurred at nutrient-poor sites. *Native European beech can stabilize microbial community structure irrespective of site conditions. *Root-derived resources likely drive the functioning of microbial communities. *Introduced Douglas-fir may have particularly low root-derived resources at nutrient-poor sites. *Soil pH well explained the effects of forest type and site conditions in soil." @default.
• W3048948032 created "2020-08-18" @default.
• W3048948032 creator A5030386075 @default.
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• W3048948032 date "2020-08-04" @default.
• W3048948032 modified "2023-09-23" @default.
• W3048948032 title "Mixing coniferous and deciduous trees (Fagus sylvatica): Site-specific response of microorganisms in litter and soil" @default.
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