Characteristics of net ecosystem carbon dioxide exchange (NEE) from August to October of Alpine meadow on the Tibetan Plateau, China |
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Authors: | Xu Lingling Zhang Xianzhou Shi Peili Yu Guirui and Sun Xiaomin |
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Institution: | (1) Institute of Geographical Sciences and Natural Resources Research, Beijing, 100101, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | The Alpine meadow is one of the vegetation types widely distributed on the Tibetan Plateau in China with an area of about
1.2 million square kilometers. The Damxung rangeland station, located in the hinterland of the Tibetan Plateau, is covered
with an typical vegetation. The continuous carbon flux data (from August to middle October, 2003) measured with the open-path
eddy covariance system was used to analyze the diurnal variation pattern of net ecosystem carbon dioxide exchange (NEE) and
its relationship with the environmental factors, such as photosynthetically active radiation (PAR), precipitation, and temperature.
Results showed that NEE presented obvious diurnal variation pattern with single-peak of diurnal maximum carbon assimilation
at 11: 00–12: 00 (local time) with an average of −0.268 mg CO2·m−2·s−1, i.e., −6.08 μmol CO2·m−2·s−1. During the daytime, NEE fitted fairly well with PAR in a rectangular hyperbola function with the apparent quantum yield
(0.020 3 μmol CO2 μmol−1 PAR) and maximum ecosystem assimilation (9.741 1 μmol CO2·m−2·s−1). During the night-time, NEE showed a good exponential relation with the soil temperature at 5 cm depth.
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Translated from Acta Ecologica Sinica 2005, 25(8): 1948–1952 译自: 生态学报, 2005, 25(8): 1948–1952] |
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Keywords: | Tibetan Plateau in China Alpine meadow eddy covariance carbon flux environmental factors |
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