RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (01): 91-99.doi: 10.11870/cjlyzyyhj201701011

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STUDY ON CARBON FLUX CHARACTERISTICS OF THE UNDERLYING SURFACE OFURBAN ECOSYSTEM-A CASE STUDY OF SHANGHAI FENGXIAN UNIVERSITY CITY

GONG Yuan1, ZHAO Min1, YAO Xin2, GUO Zhi-juan2, HE Yi1, ZHANG Li-ping1, LIN Wen-peng1   

  1. 1. Urban Research Center of Ecology and Environment, Shanghai Normal University, Shanghai 200234, China;
    2. Life and Environmental Sciences college, Shanghai Normal University Shanghai 200234, China
  • Received:2016-05-18 Revised:2016-08-15 Online:2017-01-20
  • Supported by:
    National Natural Science Foundation of China (31100354, 41571047)

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Abstract: Cities are the largest carbon source and have the major contribution to atmospheric carbon dioxide under the rapid urbanization. Quantifying the urban carbon flux characteristics is very important. In this study, Eddy Covariance(EC) data and GIS tool were used to explore the footprint and carbon flux characteristics based on Eddypro and ART footprint tool in Fengxian University Town, Shanghai.The underlying surface of the study area is complex, which is composed of herbaceous, woody and other permeable layer(named as natural system) and buildings, roads and other impervious layer(named as social system). The results showed that under different wind directions, carbon flux contribution areas were expanding with the increasing atmospheric stability. When the atmosphere was under the static condition, the range of carbon flux contribution areas under non-main wind direction(the maximum range was 1100 m)was larger than that of the carbon flux contribution area under main wind direction(the maximum range was 780 m). When the atmosphere was under the unstable condition, the carbon flux contribution area under main wind direction and non-main wind direction had little difference (maximum ranges were 321 meters and 351 meters,respectively). The source and sink characteristics of different underlying surface were different. Mean annual carbon flux of the natural system with green plants as the principal component was4.1μmol/m2/s, which was a carbon sink; mean annual carbon flux of the social system was 8.6 μmol/m2/s, which was a carbon source. Carbon flux diurnal variations of natural system in different seasons were different.The variation roughly presents a "U" shape; there was no obvious seasonal difference for carbon flux diurnal of the social system.The carbon and the variable characteristics roughly presented an "M" shape. This study may be useful for establishing low-carbon city and managing urban green spaces.

Key words: eddy observation technology, underlying surface, social system, natural system, carbon flux, footprint analysis

CLC Number: 

  • Q14
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