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Carbon dioxide exchange of a Russian boreal forest after disturbance by wind throw (2002)

Knohl, Alexander ; Kolle, Olaf ; Minayeva, Tatiana Y. ; [et al.]

Oxford, UK : Blackwell Science Ltd

Global change biology 8 (2002), S. 0

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ISSN: 1365-2486

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography

Notes: The exchange of carbon dioxide (CO2) between the atmosphere and a forest after disturbance by wind throw in the western Russian taiga was investigated between July and October 1998 using the eddy covariance technique. The research area was a regenerating forest (400 m × 1000 m), in which all trees of the preceding generation were uplifted during a storm in 1996. All deadwood had remained on site after the storm and had not been extracted for commercial purposes. Because of the heterogeneity of the terrain, several micrometeorological quality tests were applied. In addition to the eddy covariance measurements, carbon pools of decaying wood in a chronosequence of three different wind throw areas were analysed and the decay rate of coarse woody debris was derived.During daytime, the average CO2 uptake flux was −3 µmol m−2s−1, whereas during night-time characterised by a well-mixed atmosphere the rates of release were typically about 6 µmol m−2s−1. Suppression of turbulent fluxes was only observed under conditions with very low friction velocity (u* ≤ 0.08 ms−1). On average, 164 mmol CO2 m−2d−1 was released from the wind throw to the atmosphere, giving a total of 14.9 mol CO2 m−2 (180 g CO2 m−2) released during the 3-month study period.The chronosequence of dead woody debris on three different wind throw areas suggested exponential decay with a decay coefficient of −0.04 yr−1. From the magnitude of the carbon pools and the decay rate, it is estimated that the decomposition of coarse woody debris accounted for about a third of the total ecosystem respiration at the measurement site. Hence, coarse woody debris had a long-term influence on the net ecosystem exchange of this wind throw area.From the analysis performed in this work, a conclusion is drawn that it is necessary to include into flux networks the ecosystems that are subject to natural disturbances and that have been widely omitted into considerations of the global carbon budget. The half-life time of about 17 years for deadwood in the wind throw suggests a fairly long storage of carbon in the ecosystem, and indicates a very different long-term carbon budget for naturally disturbed vs. commercially managed forests.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-2486.2002.00475.x

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Experimental investigation of turbulent processes in a complex terrain (1988)

Foken, Thomas ; Pretel, Jan ; Bednář, J. ; [et al.]

Springer

Studia geophysica et geodaetica 32 (1988), S. 318-328

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ISSN: 1573-1626

Source: Springer Online Journal Archives 1860-2000

Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics

Description / Table of Contents: Summary In the present paper the first results of the international “KOPEX-86“ experiment are presented. The experiment took place at the Kopisty Atmospheric Observatory of the Institute of Physics of the Atmosphere in Prague as part of a special project of the Commission of the Academy of Sciences in Planetary Geophysics (KAPG) in June and July 1986. Using 4 ultrasonic anemometers at 4 levels up to 80 m, Doppler-SODAR and wind-, temperature- and radiation balance gradients from 2 to 80 m, a complex investigation of the atmospheric boundary layer in an industrial area was made. The authors present the first results of the anthropogenic influence on the energy exchange in the atmospheric boundary layer. the influence of a complex terrain on the turbulent characteristics and their vertical distribution.

Notes: Резюме Сообщaюmся nервые резульmamы меж¶rt;унaро¶rt;ного эксnерuменma „КОПЭКС-86“. Эксnерuменm nрово¶rt;uлся в mеченuе uюня u uюля 1986г. нa коnuсmскоŭ меmеорологuческоŭ обсервamорuu Инсmumуma фuзuкu amмосферы АН ЧССР в рaмкaх nроекma КАПГ. Прu nомощu 4 aкусmuческuх aнемомеmров нa 4 высоmaх ¶rt;о 80 м, ¶rt;оnnлеровского со¶rt;aрa u uзмеренuŭгрa¶rt;uенmов скоросmu веmрa, mемnерamуры u рa¶rt;uaцuu в слое с 2 ¶rt;о 80 м nрово¶rt;uлuсь комnлексные uссле¶rt;овaнuя nогрaнuяного слоя amмосферы. Абmоры nре¶rt;лaгaюm nервые резульmamы, кaсaющuеся uссле¶rt;овaнuŭ aнmроnогенных воз¶rt;еŭсmвuŭ нa знергеmuческuŭ обмен в nогрaннчном слое amмосферы, влuянuŭ nересеченноŭ месmрносmu нa хaрaкmерuсmuкu mурбуленmрносmu u нa uх верmuкaльное рaсnре¶rt;еленuе.