Large interannual variability in net ecosystem carbon dioxide exchange of a disturbed temperate peatland

被引:30
作者
Aslan-Sungur, Guler [1 ]
Lee, Xuhui [2 ,3 ]
Evrendilek, Fatih [4 ]
Karakaya, Nusret [4 ]
机构
[1] Tunceli Univ, Dept Chem Engn, TR-62000 Tunceli, Turkey
[2] Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, Nanjing, Jiangsu, Peoples R China
[3] Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06511 USA
[4] Abant Izzet Baysal Univ, Dept Environm Engn, TR-14280 Bolu, Turkey
关键词
Disturbed temperate peatland; Net ecosystem carbon exchange; Water availability; Eddy covariance; ENERGY-BALANCE CLOSURE; SUB-ALPINE FOREST; EDDY-COVARIANCE; CO2; EXCHANGE; NORTHERN PEATLAND; SEASONAL-VARIATION; WATER; FLUXES; METHANE; SOIL;
D O I
10.1016/j.scitotenv.2016.02.153
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Peatland ecosystems play an important role in the global carbon (C) cycle as significant C sinks. However, human-induced disturbances can turn these sinks into sources of atmospheric CO2. Long-term measurements are needed to understand seasonal and interannual variability of net ecosystem CO2 exchange (NEE) and effects of hydrological conditions and their disturbances on C fluxes. Continuous eddy-covariance measurements of NEE were conducted between August 2010 and April 2014 at Yenicaga temperate peatland (Turkey), which was drained for agricultural usage and for peat mining until 2009. Annual NEE during the three full years of measurement indicated that the peatland acted as a CO2 source with large interannual variability, at rates of 246, 244 and 663 g Cm-2 yr(-1) for 2011, 2012, and 2013 respectively, except for June 2011, and May to July 2012. The emission strengths were comparable to those found for severely disturbed tropical peatlands. The peak CO2 emissions occurred in the dry summer of 2013 when water table level (WTL) was below a threshold value of -60 cm and soil water content (SCW) below a threshold value of 70% by volume. Water availability index was found to have a stronger explanatory power for variations in monthly ecosystem respiration (ER) than the traditional water status indicators (SCW and WTL). Air temperature, evapotranspiration and vapor pressure deficient were the most significant variables strongly correlated with NEE and its component fluxes of gross primary production and ER. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:192 / 202
页数:11
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