Location
Chongming Dongtan station is located in the Shanghai Chongming Dongtan National Nature Reserve (31°25′~31°38′ N, 121°50′~122°05′ E，altitude of 0-5 meters). This station represent the salt marsh ecological type. There are three flux towers established along the elevation gradient, which located in 31°31′0"N，121°57′38.58"E (CMW-1), 31°35′4.74"N, 121°54′12.42"E (CMW-2), and 31°31′0.84"N, 121°58′18"E (CMW-3), respectively.
Climatic
Chongming Dongtan station locates in the north border of mid-subtropics in China, which is affected by subtropical monsoon climate. The climatic features include the comfortable temperatures, humid air and four distinct seasons. Spring lasts form April 5 to June 16; Summer begins in June 17 and ends in September 19, summer is slightly longer than the spring; The shortest season is autumn, only about two month, from September 20 to November 21; The longest season is winter, it begins in November 22 and ends in April 4 of the following year. The annual mean temperature is 15.3℃, and the extreme maximum temperature was 37.3℃, and the extreme minimum temperature was -10.5℃.
The annual sum precipitation is 1022 mm, and more than 71% of the annual precipitation falls during the April to September. The annual total sunshine time adds up to 2137.9 hours, and the yearly frost-free time add up to 229 days.
Vegetation and soil
Subtropical saltmarsh vegetation is the main type of vegetation in this research area. The vegetation was dominated by Spartina alterniflora, Phragmites australis and Scirpus mariqueter. In addition, there are Carex scabrifolia and Scirpus triqueter that’s normally present in the research area.The soil type of Chongming Dongtan is coastal alluvial soil, and the salinity between 2% and 6%, and pH value is about 8.0. This soil texture was strongly influenced by tidal action as the soil formation is the result of sedimentation.The closer to land, soil particle-size is lower. In the high tidal flat，the main sediments are made up of silt and the average particle size is 20.8 μm；In the middle tidal flat，the main sediments are made up of clay and the average particle size is 30.1μm; But in the low tidal flat, the greater part of the sediments are sand and the average particle size is 40μm. Soil bulk density is between 0.87 and 1.29 g cm-3. The content of soil organic carbon in topsoil (0-20 cm) is from 1.15 to 8.39 mg/g soil, while the content of soil total nitrogen is from 0.23 to 1.10 mg/g soil.
Observation system
Three-axis sonic anemometer (CSAT-3, Campbell, USA), CO2 analyzer (Li-7500, Li-Cor, USA), methane analyzer (Li-7700, Li-Cor, USA), net radiation sensor (CNR1, Kipp and Zonen, Holland), PAR (Li-190SB, Li-Cor, USA), temperature and relative humidity sensor (HMP45C, Vaisala, Finland), rain gauge (TR515MM, Texas Electronics, USA), and detailed information is attached.The three-axis sonic anemometer, CO2 analyzer and CH4 analyzer measured at high-frequency (10 Hz), and other meteorological parameters of the probes run at different measuring frequency, but are outputted as 30 min average or sum.
Principal Investigator
Bin Zhao
E-mail: zhaobin@fudan.edu.cn
1) Ge Z-M*, Guo H-Q, Zhao B, Zhang L-Q. 2015. Plant invasion impacts on the gross and net primary production of the salt marsh on eastern coast of China: insights from leaf to ecosystem. Journal of Geophysical research-Biogeosciences, 120, 169–186
2) Xie X, Zhang M-Q., Zhao B, Guo H-Q*. 2014. Dependence of coastal wetland ecosystem respiration on temperature and tides: a temporal perspective: a temporal perspective. Biogeosciences, 11, 539-545.
3) Ma Z-J*, Hua N, Zhang X, Guo H-Q, Zhao B, Ma Q, Xue W-J, Tang C-D. 2011. Wind conditions affect stopover decision and fuel stores of migratory shorebirds in the South Yellow Sea along the East Asian-Australasian Flyway. The International Journal of Avian Science (IBIS) 153, 755–767.
4) Guo H-Q, Zhao B*, Chen J-Q, Yan Y-E, Li B, Chen J-K. 2010. Seasonal change of energy fluxes in an estuarine wetland of Shanghai, China. Chinese Geographical Science, 20(1): 23-29.
5) Yan Y-E, Guo H-Q, Gao Y, Zhao B*, Chen J-Q, Li B, Chen J-K. 2010. Variations of net ecosystem CO2 exchange in a tidal inundated wetland: coupling MODIS and tower-based fluxes. Journal of Geophysical Research - Atmospheres. 115: D15102.
6) Guo H-Q, Noormets A, Zhao B*, Chen J-Q, Sun G, Gu Y-J, Li B, Chen J-K. 2009. Tidal effects on net ecosystem exchange of carbon in an estuarine wetland. Agricultural and Forest Meteorology, 149: 1820-1828.
7) Yan Y-E, Zhao B*, Chen J-Q, Guo H-Q, Gu Y-J, Wu Q-H, Li B. 2008. Closing the carbon budget of estuarine wetlands with tower-based measurements and MODIS time series. Global Change Biology, 14: 1690-1702.
8) 谢潇，朱文渤，郭海强，赵斌*。2013。潮汐与降雨对滨海湿地地下水位的影响。复旦学报。
9) 顾永剑，高宇，郭海强，赵斌*，2008。崇明东滩湿地生态系统碳通量贡献区分析。复旦学报。47(3): 374-379, 386。
10) 严燕儿，赵斌*，郭海强，吴千红，2008。生态系统碳通量估算中耦合涡度协方差技术与遥感技术的研究进展。地球科学进展。23(8): 884-894。
11) 郭海强、顾永剑、李博、陈家宽、陈吉泉、赵斌*，2007。全球碳通量东滩野外观测站的建立。湿地科学与管理，(1): 30-33。