[1]ZHU Jingbin,HE Huidan,ZHANG Fawei,et al.Effect of Temperature Difference Between Day and Night on NEE and Its Variation Characteristics in Alpine Shrubland in Qinghai-Tibetan Plateau[J].Research of Soil and Water Conservation,2020,27(04):232-238.
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Effect of Temperature Difference Between Day and Night on NEE and Its Variation Characteristics in Alpine Shrubland in Qinghai-Tibetan Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 04
Page number:
232-238
Column:
目次
Public date:
2020-06-20
- Title:
- Effect of Temperature Difference Between Day and Night on NEE and Its Variation Characteristics in Alpine Shrubland in Qinghai-Tibetan Plateau
- Keywords:
- temperature difference between day and night; alpine shrubland; NEE; the Qinghai-Tibetan Plateau
- CLC:
- S812
- DOI:
- -
- Abstract:
- In order to explore the effect of the decrease of the temperature difference between day and night on the carbon balance of alpine ecosystem under the background of climate change, based on CO2 flux measured with the eddy covariance technique, we analyzed the relationship between NEE and temperature difference between day and night over an alpine shrubland on the Qinghai-Tibetan Plateau from 2009 to 2011. The results show that the daily change trend of NEE was similar, and the maximum carbon absorption all occurred in July, which were -263.49,-318.73,-278.47 g/(m2·month), respectively; the annual NEE of alpine shrubland ecosystem was -466.19,-483.65,-204.83 g/(m2·a)in 2009, 2010 and 2011, respectively, suggesting that the alpine shrubland ecosystem was a carbon sink; the daily maximum temperature and daily minimum temperature both presented the trend of increasing at first and then decreasing in the whole year, while the temperature difference between day and night presented the opposite trend; furthermore, the minimum monthly average temperature difference between day and night all appeared in September from 2009 to 2011, which were 11.28, 12.29 and 10.87℃, however, the minimum monthly NEE all occurred in July; the temperature difference between day and night showed significant negative correlation with NEE in each month from May to September in 2009, 2010 and 2011, indicating that the increase of temperature difference between day and night in growing season of alpine shrubland was beneficial to the accumulation of carbon in the ecosystem, and suggesting that alpine shrubland might promote the carbon loss of the terrestrial ecosystem under the temperature difference between day and night decrease in the future.
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Last Update:
2020-07-09