期刊
PLANT AND SOIL
卷 409, 期 1-2, 页码 143-157出版社
SPRINGER
DOI: 10.1007/s11104-016-2956-4
关键词
Ectomycorrhizal fungi; Organic nitrogen; Glutamine uptake; Drought; N concentration; Beech; Fagus sylvatica; Calcareous soil; Acid soil
资金
- Deutsche Forschungsgemeinschaft [Po362/19-1]
- DFG Priority Program Infrastructure-Biodiversity-Exploratories [1374, Po362/18-3]
- Chinese Science Council (CSC)
The role of different soil types for beech productivity and drought sensitivity is unknown. The aim of this experimental study was to compare mycorrhizal diversity between acid sandy and calcareous soils and to investigate how this diversity affects tree performance, nitrogen uptake and use efficiency (NUE). Beech trees were germinated and grown in five different soil types (pH 3.8 to 6.7). One-and-a-half-year-old plants were exposed for 6 weeks to sufficient or low soil humidity. Tree biomass, root tip mycorrhizal colonization and community structure, root tip mortality, leaf area, photosynthesis, nitrogen concentrations, NUE and short-term N-15 uptake from glutamine were determined. Soil type did not affect photosynthesis or biomass formation, with one exception in calcareous soil, where root mortality was higher than in the other soil types. Beech in acid soils showed lower mycorrhizal colonization, higher nitrogen tissue concentrations, and lower NUE than those in calcareous soils. Drought had no effect on nitrogen concentrations or NUE but caused reductions in mycorrhizal colonization. Mycorrhizal species richness correlated with nitrogen uptake and NUE. Nitrogen uptake was more sensitive to drought in calcareous soils than in acid soils. Beech may be more drought-susceptible on calcareous sites because of stronger decrease of organic nitrogen uptake than on acid soils.
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