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Carbon Dioxide Exchange Between the Atmosphere and an Alpine Shrubland Meadow During the Growing Season on the Qinghai‐Tibetan Plateau
Author(s) -
ZHAO Liang,
LI YingNian,
GU Song,
ZHAO XingQuan,
XU ShiXiao,
YU GuiRui
Publication year - 2005
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/j.1744-7909.2005.00066.x
Subject(s) - shrubland , eddy covariance , ecosystem , growing season , environmental science , plateau (mathematics) , carbon dioxide , carbon sink , sink (geography) , atmospheric sciences , ecosystem respiration , zoology , agronomy , ecology , geography , biology , geology , mathematical analysis , mathematics , cartography
In the present study, we used the eddy covariance method to measure CO 2 exchange between the atmosphere and an alpine shrubland meadow ecosystem (37°36’N, 101°18’E; 3 250 m a.s.l.) on the Qinghai‐Tibetan Plateau, China, during the growing season in 2003, from 20 April to 30 September. This meadow is dominated by formations of Potentilla fruticosa L. The soil is Mol‐Cryic Cambisols. During the study period, the meadow was not grazed. The maximum rates of CO 2 uptake and release derived from the diurnal course of CO 2 flux were ‐9.38 and 5.02 μmol·m ‐2 ·s ‐1 , respectively. The largest daily CO 2 uptake was 1.7 g C·m ‐2 ·d ‐1 on 14 July, which is less than half that of an alpine Kobresia meadow ecosystem at similar latitudes. Daily CO 2 uptake during the measurement period indicated that the alpine shrubland meadow ecosystem may behave as a sink of atmospheric CO 2 during the growing season. The daytime CO 2 uptake was correlated exponentially or linearly with the daily photo synthetic photon flux density each month. The daytime average water use efficiency of the ecosystem was 6.47 mg CO 2 /g H 2 O. The efficiency of the ecosystem increased with a decrease in vapor pressure deficit. (Managing editor: Ya‐Qin HAN)