Abstract
Limited nutrient acquisition from soil is a key process limiting productivity in boreal forest. We investigated short-root morphological adaptations and rhizosphere effect in relation to site conditions in interaction with tree mineral nutrition. We studied seven young (8- to 14-year-old) silver birch (Betula pendula Roth.) stands on abandoned agricultural land in Estonia. Soil pH varied from 3.8 to 7.0, and soil N % from 0.07 to 0.26%. Tree nutrient (NPK) status was expressed by leaf nutrient concentrations. Leaf N correlated negatively with short-root specific length and area. Summed activity (SA) and metabolic diversity of bacteria (by BIOLOG Ecoplate™), bacterial community diversity (by DGGE) and pHKCl were determined for rhizosphere (R) and bulk soil (S) to reveal the extent of the rhizosphere effect. Bacterial activity in rhizosphere was 1.4–4.7 times higher than in bulk soil. Ratio SAR/SAS indicating root support to the rhizosphere bacterial communities decreased with increasing bulk soil pH; however, when bulk soil pH was ≥5, the decrease in SAR/SAS was insignificant, i.e. the rhizosphere effect stayed at a stable level. Diversity of bacterial community was 6% higher in bulk soil than in rhizosphere. Rhizosphere acidification occurred in studied stands when bulk soil pHKCl ≥ 5. Short-root N % correlated positively with SAR/SAS. We concluded that tree N-nutritional status was related to short-root morphological parameters but not to studied microbiological characteristics in the soil of young silver birch stands.
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Abbreviations
- BAS:
-
Microbial basal respiration
- CLPP:
-
Community-level physiological profiles
- DGGE:
-
Denaturing gradient gel electrophoresis
- MD:
-
Metabolic diversity (Shannon index) by Biolog EcoPlates
- R:
-
Rhizosphere
- PCA:
-
Principal component analysis
- S:
-
Bulk soil
- SA:
-
Summed activity of cultivable bacteria, obtained with Biolog EcoPlates
- SIR:
-
Substrate-induced respiration
- SRA:
-
Specific root area
- SRL:
-
Specific root length
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Acknowledgments
This study was supported by Grants No. 7792 and 7452 of the Estonian Science Foundation, by Target Projects No. SF0180127s08 and SF0182732s06 of the Ministry of Education and Research of the Republic of Estonia and by the EU through the European Regional Development Fund (Center of Excellence FIBIR). We thank Dr. Jaak Jaagus for meteorological information for the stands, Dr. Arno Kanal for his kind help in soil taxonomy, and Mr. Ilmar Part for linguistic revision of the manuscript.
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Rosenvald, K., Ostonen, I., Truu, M. et al. Fine-root rhizosphere and morphological adaptations to site conditions in interaction with tree mineral nutrition in young silver birch (Betula pendula Roth.) stands. Eur J Forest Res 130, 1055–1066 (2011). https://doi.org/10.1007/s10342-011-0492-6
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DOI: https://doi.org/10.1007/s10342-011-0492-6