Journal ArticleDOI
The use of stable isotopes in ecosystem research. First results of a field study with 15N
TLDR
In this article, the distribution of labelled nitrogen (as 15N-NH4 + and 15N[sbnd]NO3 −) within a spruce ecosystem (Picea abies (L.) Karst) in competition with understory vegetation of Vaccinium myrtillus, Calluna vulgaris and Deschampsia flexuosa) was investigated.Abstract:
Terrestrial ecosystems, e.g. forest ecosystems, are characterized by a complex and sensitive network of biotic and abiotic factors and their interactions. By using stable isotopes (e.g. labelled nitrogen compounds), very small addition rates of highly enriched compounds can be applied, which do not change or disturb the investigated system, but provide information about single processes, their interactions and especially about their dynamics. First results of a field study in the Fichtelgebirge, Northeast-Bavaria, Germany, are presented. The distribution of labelled nitrogen (as 15N-NH4 + and 15N[sbnd]NO3 −) within a spruce ecosystem (Picea abies (L.) Karst. in competition with understory vegetation of Vaccinium myrtillus, Calluna vulgaris and Deschampsia flexuosa) showed maximum 15N concentrations in tissues of the understory vegetation. During the first six weeks after the 15N application, the nitrogen uptake of all investigated species was higher after the 15N[sbnd]NO3 − treatment than after t...read more
Citations
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Book ChapterDOI
Water and nutrient acquisition by roots and canopies
Ram Oren,David W. Sheriff +1 more
TL;DR: In this article, the effects of mycorrhizae and anthropogenic pollution on water and nutrient acquisition in Pinus species are discussed based on results from observational studies of unmanipulated plants and of stands.
Journal ArticleDOI
Elevated temperature differently affects growth, photosynthetic capacity, nutrient absorption and leaf ultrastructure of Abies faxoniana and Picea purpurea under intra- and interspecific competition.
TL;DR: It is demonstrated that ET significantly affects the asymmetric competition patterns in subalpine conifer species, particularly on high-altitude trees, which are more sensitive to warming.
Journal ArticleDOI
Advances in nitrogen-15 use for environmental studies in the soil-plant system
TL;DR: A review of the latest results in the use of nitrogen-15 in the soil-plant system is presented in this paper, which covers the period from 1991 to early April 1993.
Journal ArticleDOI
Uptake of [15N] Ammonium and [15N]Nitrate in a 140-Year-Old Spruce Stand (Picea abies) in the Fichtelgebirge (NE Bavaria)
TL;DR: An aim of the present study was to perfect a method of preparation of soil extracts for isotope ratio mass spectrometry (IRMS) measurements by steam distillation and subsequent freeze drying.
Journal ArticleDOI
Methodische Untersuchungen zum 15N-ConFlo-IRMS-System
M. Gehre,D. Hofmann,P. Weigel +2 more
TL;DR: In this article, the C-GC-IRMS-System (elemental analyzer EA 1108 CHN + IRMS MAT 252) was used to evaluate the external precision of the δ15N values after changeover from 13C to 15N measurements.
References
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Journal ArticleDOI
Mineral Nutrient Requirements of Pinus silvestris and Picea abies Seedlings
TL;DR: In this article, the mineral requirements of Pinus silvestris L. and Picea abies Karst were studied according to previously published methods applied to a series of various plant species.
Journal ArticleDOI
Carbon and nitrogen isotope ratios in different compartments of a healthy and a declining Picea abies forest in the Fichtelgebirge, NE Bavaria.
TL;DR: The result confirms earlier conclusions from gas exchange measurements that gaseous air pollutants did no long-lasting damage in an area where such damage was expected and the problem of separation of ammonium or nitrate use by roots from different soil horizons is discussed.
Journal ArticleDOI
Simultaneous estimation of several nitrogen cycle rates using 15N: Theory and application
David D. Myrold,James M. Tiedje +1 more
TL;DR: In this article, the authors used the principles of isotope dilution, modeling, and nonlinear parameter estimation to simultaneously determine N cycle rates and found that both zero-and first-order models could describe N cycling, with the firstorder model being more generally appropriate.
Journal ArticleDOI
Performance of two Picea abies (L.) Karst. stands at different stages of decline : VII. Nutrient relations and growth.
TL;DR: A declining, closed-canopy Picea abies (L.) Karst stand produced as much crown biomass as a healthy stand, although some trees were chlorotic due to magnesium deficiency, and nutritional disharmony was identified as the mechanism for reduced tree vigor.
Journal ArticleDOI
Nitrate utilization by species from acidic and calcareous soils
TL;DR: A comparison of closely adjacent acidic and calcareous soils showed that nitrate is an important source of inorganic combined nitrogen in at least some acidic soils.
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