Bioklimatische Unterschiede zwischen einer Stadt- und einer Waldatmosph�re

Mayer, Helmut; Gietl, G.

doi:10.1007/bf01553590

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…Meteorological data (air temperature, relative humidity, photosynthetic active radiation, precipitation) were determined continuously at the measurement tower by the Meteorological Institute of the University of Freiburg, Germany. Air temperature and humidity were measured using a psychrometer according to Frankenberger (Mayer & Gietl, 1976) at 15.5 m height. PAR was determined by Li‐190SZ‐Sensors (Licor Inc., Lincoln, NE, USA) at 29 m, precipitation was measured at 30 m. All meteorological data were calculated as half‐hourly mean values.…”

Section: Methodsmentioning

confidence: 99%

Short‐term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation

Brandes

Kodama

Whittaker

et al. 2006

Global Change Biology

138

214

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We aimed to quantify the separate effects of photosynthetic and postphotosynthetic carbon isotope discrimination on d 13 C of the fast-turn-over carbon pool (water soluble organic carbon and CO 2 emitted from heterotrophic tissues), including their diel variation, along the pathway of carbon transport from the foliage to the base of the stem.For that purpose, we determined d 13 C in total and water-soluble organic matter of the foliage plus d 13 C and d 18 O in phloem organic matter of twigs and at three heights along the stem of Pinus sylvestris over a nine-day period, including four measurements per day. These data were related to meteorological and photosynthesis parameters and to the d 13 C of stem-emitted CO 2 .In the canopy (foliage and twigs), the d 13 C of soluble organic matter varied diurnally with amplitudes of up to 1.9%. The greatest 13 C enrichment was recorded during the night/early morning, indicating a strong influence of starch storage and remobilization on the carbon isotope signatures of sugars exported from the leaves. 13 C enrichment of soluble organic matter from the leaves to the twig phloem and further on to the phloem of the stem was supposed to be a result of carbon isotope fractionation associated with metabolic processes in the source and sink tissues. CO 2 emitted from the stem was enriched by 2.3-5.2% compared with phloem organic matter. When day-to-day variation was addressed, water-soluble leaf d 13 C and twig phloem d 18 O were strongly influenced by c i /c a and stomatal conductance (G s ), respectively.These results show that both photosynthetic and postphotosynthetic carbon isotope fractionation influence d 13 C of organic matter over time, and over the length of the basipetal transport pathway. Clearly, these influences on the d 13 C of respired CO 2 must be considered when using the latter for partitioning of ecosystem CO 2 fluxes or when the assessment of d 13 C in organic matter is applied to estimate environmental effects in c i /c a .

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Section: Methodsmentioning

confidence: 99%

Short‐term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation

Brandes

Kodama

Whittaker

et al. 2006

Global Change Biology

138

214

View full text Add to dashboard Cite

show abstract

“…Meteorological data [air temperature, relative humidity, photosynthetically active radiation, precipitation (PAR) and wind speed] were determined continuously at a measurement tower. Air temperature, humidity and vapour pressure deficit (VPD) were determined using a psychrometer according to Frankenberger (Mayer & Gietl 1976) at 2, 12 and 19 m height. Wind speed was measured with cup anemometers at 2, 6, 12, 15 and 19 m height.…”

Section: Methodsmentioning

confidence: 99%

Evaporative enrichment and time lags between δ¹⁸O of leaf water and organic pools in a pine stand

Barnard

Salmon

Kodama³

et al. 2007

Plant Cell & Environment

117

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“…Vergleicht man die Ergebnisse von Wyk mit den ftir das Zentrum von Mtinchen und for den Ebersberger Forst[ 12] berechneten, so zeigt sich, dat~ die nach dem Teq-und dem EZ-Kriterium ermittelte Anzahl yon Stunden mit Schwt~le an der Kfiste immer am kleinsten ist (Tabelle 3). Die je Monat und Stunde gr6gten Hfiufigkeiten sind aber wesentlich kleiner als beim e-Kriterium; sie betragen im Juli 2,6% (12 bis 15 Uhr) und im August zu allen Terminen jeweils 0,7%.…”

unclassified

“…Die je Monat und Stunde gr6gten Hfiufigkeiten sind aber wesentlich kleiner als beim e-Kriterium; sie betragen im Juli 2,6% (12 bis 15 Uhr) und im August zu allen Terminen jeweils 0,7%. Im Bestandsraum treten zwar hohe Luftfeuchtigkeiten, aber wesentlich niedrigere Lufttemperaturen als in der Stadt auf[ 12]. Da aber Schwtile nut dann empfunden H. Mayer wird, wenn neben einer hohen Luftfeuchtigkeit auch eine hohe Lufttemperatur vorhanden ist, liegt die Vermutung nahe, dafS die nach dem e-Kriterium ermittelte Schwfileh~iufigkeit ~iber der tatsgchlichen liegt.…”

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Schwüleverhältnisse an der deutschen Nordseeküste

Mayer¹

1976

Arch. Met. Geoph. Biokl. B.

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ZusammenfassungAus meteorologischen Daten (1956Daten ( bis 1960 von der Insel F6hr vor der deutschen Nordseektiste werden mittlere Tagesg/inge, Monatsmittelwerte und Pentadenmittelwerte der Lufttemperatur Ta, der relativen Luftfeuchtigkeit RH, des Dampfdmcks e, der ~.quivalenttemperatur Teq und der effektiven Temperatur ET berechnet. Anhand der Schw01egrenzen e = 14,08 Torr, Teq = "56,0~ und ET = 24,0~ werden die Schwtileh/iufigkeiten fiir F6hr ermittelt und mit Ergebnissen aus dem Zentmm einer Grot~stadt (Miinchen) und einem Fichterthochwald (Ebersberger Forst bei Miinchen) verglichen. Dabei zeigt sich, dag die Schwiileh~iufigkeit in der Reihenfolge Kiiste-Wald-Stadt zunimmt. Sumlnag] Sultriness -Conditions at the German Nor~ Sea CoastMean diurnal variations, monthly means and 5 -day means of the air temperature Ta, the relative air humidity RH, the vapour pressure e, the equivalent temperature Teq and the effective temperatureET are computed from meteorological data of the isle of F6hr in front of the German North Sea Coast. With the sultriness boundaries e = 14.08 Torr, Teq = 56-0~ and ET = 24.0~ the frequencies of sultriness are computed and compared with the results of the centre of a city (Munich) and a spruce forest (Ebersberger Forst near Munich). It is shown, that the frequencies of sultriness increase in the sequence of coast-forest-city.

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Bioklimatische Unterschiede zwischen einer Stadt- und einer Waldatmosph�re

Cited by 8 publications

References 4 publications

Short‐term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation

Short‐term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation

Evaporative enrichment and time lags between δ¹⁸O of leaf water and organic pools in a pine stand

Schwüleverhältnisse an der deutschen Nordseeküste

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Bioklimatische Unterschiede zwischen einer Stadt- und einer Waldatmosph�re

Cited by 8 publications

References 4 publications

Short‐term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation

Short‐term variation in the isotopic composition of organic matter allocated from the leaves to the stem of Pinus sylvestris: effects of photosynthetic and postphotosynthetic carbon isotope fractionation

Evaporative enrichment and time lags between δ18O of leaf water and organic pools in a pine stand

Schwüleverhältnisse an der deutschen Nordseeküste

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Evaporative enrichment and time lags between δ¹⁸O of leaf water and organic pools in a pine stand