Ecophysiological mechanisms characterising fen and bog species: focus on variations in nitrogen uptake traits under different soil–water pH
| العنوان: | Ecophysiological mechanisms characterising fen and bog species: focus on variations in nitrogen uptake traits under different soil–water pH |
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| المؤلفون: | Takatoshi Nakamura, Motoka Nakamura |
| المصدر: | Oecologia. 168:913-921 |
| بيانات النشر: | Springer Science and Business Media LLC, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Nitrogen, Fresh Water, Nitrate reductase, Plant Roots, Carex lyngbyei, Soil, Japan, Species Specificity, Mire, Botany, Bog, Ecosystem, Ecology, Evolution, Behavior and Systematics, Analysis of Variance, geography, geography.geographical_feature_category, biology, Ecology, Hydrogen-Ion Concentration, biology.organism_classification, Habitat, Seedlings, Soil water, DNS root zone, Species richness, Carex Plant |
| الوصف: | Although the productivity and nitrogen (N)-use traits of mire plants differ dramatically between fens and bogs, soil N richness does not necessarily differ, whereas the soil-water pH is distinctly lower in bogs than in fens. The ecophysiological mechanisms underlying these relations are unclear. To assess the relative availability of N forms in relation to soil-water pH, we focused on the net N uptake rate per unit root weight (NNUR), glutamine synthetase activity and nitrate reductase activity, and performed reciprocal transplant experiments with the seedlings of fen (Carex lyngbyei) and bog (C. middendorffii) sedge species in intact habitat sites. The soil-water pH was clearly lower at the bog site, but the NH(4) (+), NO(3) (-) or dissolved organic-N concentrations did not differ between the fen and bog sites. The activity of both enzymes for inorganic-N assimilation did not differ among the sites and species. However, the fen species grown at bog sites showed a drastic decrease in the NNUR, suggesting a suppression of organic-N uptake. The bog species showed no NNUR difference between the sites. These results indicate that inorganic-N availability does not differ between the two habitats, but organic-N availability is lowered in a low-pH bog, particularly in the case of fen species. Therefore, the relative availability of N forms shows species-specific variations that depend on the differences in the soil-water pH of root zone, even at similar N richness, which would play a key role in plant distribution strategies in relation to the fen-bog gradient. |
| تدمد: | 1432-1939 0029-8549 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::575d5f5f07908bbf67243d14d89adb58 https://doi.org/10.1007/s00442-011-2161-3 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....575d5f5f07908bbf67243d14d89adb58 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 14321939 00298549 |
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