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  • 1
    In: Tree Physiology, 2014, Vol. 34(2), pp.205-213
    Description: Insights into how the simultaneous presence of organic and inorganic nitrogen (N) forms influences root absorption will help elucidate the relative importance of these N forms for plant nutrition in the field as well as for nursery cultivation of seedlings. Uptake of the individual N forms arginine, ammonium (NH 4 + ) and nitrate (NO 3 − ) was studied in Scots pine ( Pinus sylvestris (L.)) seedlings supplied as single N sources and additionally in mixtures of NO 3 − and NH 4 + or NO 3 − and arginine. Scots pine seedlings displayed a strong preference for NH 4 + -N and arginine-N as compared with NO 3 − -N. Thus, NO 3 − uptake was generally low and decreased in the presence of NH 4 + in the high-concentration range (500 µM N), but not in the presence of arginine. Moreover, uptake of NO 3 − and NH 4 + was lower in seedlings displaying a high internal N status as a result of high N pre-treatment, while arginine uptake was high in seedlings with a high internal N status when previously exposed to organic N. These findings may have practical implications for commercial cultivation of conifers.
    Keywords: Amino Acids ; Conifer ; Fertilizer
    ISSN: 0829-318X
    E-ISSN: 1758-4469
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  • 2
    Language: English
    In: International Journal of Biometeorology, 2010, Vol.54(1), pp.23-36
    Description: We investigated the water balances of two beech stands ( Fagus sylvatica L.) on opposite slopes (NE, SW) of a narrow valley near Tuttlingen in the southern Swabian Jura, a low mountain range in Southwest Germany. Our analysis combines results from continuous measurements of forest meteorological variables significant to the forest water balance, stand transpiration (ST) estimates from sap flow measurements, and model simulations of microclimate and water fluxes. Two different forest hydrological models (DNDC and BROOK90) were tested for their suitability to represent the particular sites. The investigation covers the years 2001–2007. Central aims were (1) to evaluate meteorological simulations of variables below the forest canopy, (2) to evaluate ST, (3) to quantify annual water fluxes for both beech stands using the evaluated hydrological models, and (4) to analyse the model simulations with regard to assumptions inherent in the respective model. Overall, both models were very well able to reproduce the observed dynamics of the soil water content in the uppermost 30 cm. However, the degree of fit depended on the year and season. The comparison of experimentally determined ST within the beech stand on the NE-slope during the growing season of 2007 with simulated transpiration did not yield a reliable statistical relationship. The simulation of water fluxes for the beech stand on the NE- and SW-slopes showed similar results for vegetation-related fluxes with both models, but different with respect to runoff and percolation flows. Overall, the higher evaporation demand on the warmer SW-slope did not lead to a significantly increased drought stress for the vegetation but was reflected mainly in decreased water loss from the system. This finding is discussed with regard to potential climate change and its impact on beech growth.
    Keywords: Water fluxes ; Beech stand ; Swabian Jura/SW Germany ; Forest meteorological measurements ; Sap flow measurements ; DNDC ; BROOK90 ; Modelling
    ISSN: 0020-7128
    E-ISSN: 1432-1254
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  • 3
    Language: English
    In: Plant, Cell and Environment, 2003, Vol.26, pp.1157-1168
    Keywords: Naturvetenskap ; Geovetenskap Och Miljövetenskap ; Naturgeografi ; Natural Sciences ; Earth And Related Environmental Sciences ; Physical Geography
    ISSN: 0140-7791
    Source: SwePub (National Library of Sweden)
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  • 4
    Language: English
    In: New Phytologist, 2003, Vol.159, pp.229-244
    Keywords: Naturvetenskap ; Geovetenskap Och Miljövetenskap ; Naturgeografi ; Natural Sciences ; Earth And Related Environmental Sciences ; Physical Geography
    ISSN: 1469-8137
    Source: SwePub (National Library of Sweden)
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