Soil respiration in typical plant communities in the wetland surrounding the high-salinity Ebinur Lake
Soil respiration in wetlands surrounding lakes is a vital component of the soil carbon cycle in arid regions. However, information remains limited on the soil respiration around highly saline lakes during the plant growing season. Here, we aimed to evaluate diurnal and seasonal variation in soil respiration to elucidate the controlling factors in the wetland of Ebinur Lake, Xinjiang Uygur Autonomous Region, western China. We used a soil carbon flux automatic analyzer (LI-840A) to measure soil respiration rates during the growing season (April to November) in two fields covered by reeds and tamarisk and one field with no vegetation (bare soil) from 2015 to 2016. The results showed a single peak in the diurnal pattern of soil respiration from 11:00 to 17:00 for plots covered in reeds, tamarisk, and bare soil, with minimum values being detected from 03:00 to 07:00. During the growing season, the soil respiration of reeds and tamarisk peaked during the thriving period (4.16 and 3.75 mmol•m–2•s–1, respectively), while that of bare soil peaked during the intermediate growth period (0.74 mmol•m–2•s–1). The soil respiration in all three plots was lowest during the wintering period (0.08, 0.09, and–0.87 mmol•m–2•s–1, respectively). Air temperature and relative humidity significantly influenced soil respiration. A significant linear relationship was detected between soil respiration and soil temperature for reeds, tamarisk, and bare soil. The average Q10 of reeds and tamarisk were larger than that of bare soil. However, soil moisture content was not the main factor controlling soil respiration. Soil respiration was negatively correlated with soil pH and soil salinity in all three plot types. In contrast, soil respiration was positively correlated with organic carbon. Overall, CO2 emissions and greenhouse gases had a relatively weak effect on the wetlands surrounding the highly saline Ebinur Lake.
KeywordsEbinur Lake soil respiration high salinity soil temperature soil moisture
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The research was supported by the Key Laboratory Open Project Fund of Xinjiang Uygur Autonomous Region (No. 2015KL015).
- Bao S D (2005. Soil Agricultural Chemistry Analysis. Beijing: China Agriculture Press (in Chinese)Google Scholar
- Chen H X, Liu J J, Zhang A F, Chen J, Cheng G, Sun B H, Pi X M, Dyck M, Si B C, Zhao Y, Feng H (2017. Effects of straw and plastic film mulching on greenhouse gas emissions in Loess Plateau, China: a field study of 2 consecutive wheat-maize rotation cycles. Sci Total Environ, 579: 814–824CrossRefGoogle Scholar
- Chen J, Cao J J, Wei Y L, Liu J H, Ma F L, Chen D C, Feng J Y, Xia Y, Cen Y (2014. Effect of grazing exclusion on soil respiration during the dormant season in alpine meadow grassland ecosystems on the northern shore of Qinghai Lake, China. Acta Prataculturae Sinica, 23(6): 78–86 (in Chinses)Google Scholar
- Franzen L G (1992). Can the earth afford to lose the wetlands in the battle against the increasing greenhouse effect? International Peat Society Proceedings of International Peat Congress. Uppsala, 1–18Google Scholar
- Li Z G, Lv S H, Ao Y H, Wang S Y (2012. Analysis of micrometeorology and CO2 flux characteristics over Lake Ngoring lakeside region in summer. Progress in Geography, 31(5): 602–608 (in Chinese)Google Scholar
- Mu Z J, Huang A Y, Ni J P, Li J Q, Liu Y Y, Shi S, Xie D T, Hatano R (2013. Soil greenhouse gas fluxes and net global warming potential from intensively cultivated vegetable fields in southwestern China. J Soil Sci Plant Nutr, 13(3): 566–578Google Scholar
- Murcia-Rodríguez M A, Ochoa-Reyes M P, Poveda-Gómez F E (2012. Soil respiration related to litterfall in the high-Andean forest bush (Pamplonita river basin, Colombia). Caldasia, 34(1): 165–185Google Scholar
- Reynolds J F, Smith D M S, Lambin E F, Turner B L I I, Mortimore M, Batterbury S P J, Downing T E, Dowlatabadi H, Fernandez R J, Herrick J E, Huber-Sannwald E, Jiang H, Leemans R, Lynam T, Maestre F T, Ayarza M, Walker B (2007. Global desertification: building a science for dryland development. Science, 316(5826): 847–851CrossRefGoogle Scholar
- Wang W, Chen X, Pu Z, Yuan X, Ma J (2015. Negative soil respiration fluxes in unneglectable arid regions. Pol J Environ Stud, 24(2): 905–908Google Scholar
- Wei D, Xu R, Wang Y H, Yao T D (2011. CH4, N2O and CO2 fluxes and correlation with environmental factors of alpine steppe grassland in Nam Co Region of Tibetan Plateau. Acta Agrestia Sinica, 19(3): 412–419 (in Chinese)Google Scholar
- Xie J X, Zhai C X, Li Y (2008. Comparative study of salt desert and oasis soil CO2 Flux. Prog Nat Sci, 18(3): 262–268Google Scholar
- Zhan M, Cao C G, Wang J P, Cai M L, Yuan W L (2008. Greenhouse gases exchange of integrated paddy field andtheir comprehensive global warming potentials. Acta Ecol Sin, 28(11): 5461–5468 (in Chinese)Google Scholar