[1] Nnoby, R. (1997) Carbon cycle: Inside the Black Box. Nature, 388, 522-523. http://dx.doi.org/10.1038/41441
[2] Sahagian, D. and Melack, J. (1998) Global Wetland Distribution and Functional Characterization: Trace Gases and the hydrologic Cycle. IGBP Report 46.
[3] Han, G., Xing, Q., Yu, J., et al. (2014) Agricultural Reclamation Effects on Ecosystem CO2 Exchange of a Coastal Wetland in the Yellow River Delta. Agri-culture, Ecosystems & Environment, 196, 187-198. http://dx.doi.org/10.1016/j.agee.2013.09.012
[4] IPCC (International Panel on Climate Change) (1996) Climate Change 1996—Impacts, Adaptations and Mitigation of Climate Change: Scientific Technical Analysis. Contribution of Working Group II to the Second Assessment Report of the IPCC. Cambridge University Press, Cambridge.
[5] Bassi, N., Kumar, M.D., Sharma, A., et al. (2014) Status of Wetlands in India: A Review of Extent, Ecosystem Benefits, Threats and Management Strategies. Journal of Hydrology: Regional Studies, 2, 1-19. http://dx.doi.org/10.1016/j.ejrh.2014.07.001
[6] Qi, S. and Fang, L. (2007) Environmental Degradation in the Yellow River Delta, Shandong Province, China. AMBIO: A Journal of the Human Environment, 36, 610-611. http://dx.doi.org/10.1579/0044-7447(2007)36[610:EDITYR]2.0.CO;2
[7] Xu, X., Lin, H. and Fu, Z. (2004) Probe into the Method of Regional Ecological Risk Assessment—A Case Study of Wetland in the Yellow River Delta in China. Journal of Environmental Management, 70, 253-262. http://dx.doi.org/10.1016/j.jenvman.2003.12.001
[8] Liu, X.Z. and Qi, S.Z. (2011) Wetlands Environmental Degra-dation in the Yellow River Delta, Shandong Province of China. Procedia Environmental Sciences, 11, 701-705. http://dx.doi.org/10.1016/j.proenv.2011.12.109
[9] Qin, Y., Yang, Z. and Yang, W. (2010) A Novel Index System for Assessing Ecological Risk under Water Stress in the Yellow River Delta Wetland. Procedia Environmental Sciences, 2, 535-541. http://dx.doi.org/10.1016/j.proenv.2010.10.058
[10] Chen, Q.F., Ma, J.J., Liu, J.H., et al. (2013) Characteristics of Greenhouse Gas Emission in the Yellow River Delta Wetland. International Biodeterioration & Biodegradation, 85, 646-651. http://dx.doi.org/10.1016/j.ibiod.2013.04.009
[11] Funk, D.W., Noel, L.E. and Freedman, A.H. (2004) En-vironmental Gradients, Plant Distribution, and Species Richness in Arctic Salt Marsh near Prudhoe Bay, Alaska. Wet-lands Ecology and Management, 12, 215-233. http://dx.doi.org/10.1023/B:WETL.0000034074.81373.65
[12] He, Q., Cui, B.S., Zhao, X.S., Fu, H.L. and Liao, X.L. (2009) Relationships between Salt Marsh Vegetation Distribution/Diversity and Soil Chemical Factors in the Yellow River Estuary. Acta Ecologica Sinica, 29, 676-686.
[13] Tessier, A., Campbell, P.G.C. and Bisson, M. (1979) Sequen-tial Extraction Procedure for the Speciation of Particulate Trace Metals. Analytical Chemistry, 51, 844-851. http://dx.doi.org/10.1021/ac50043a017
[14] APHA (2005) Standard Methods for the Examination of Water and Wastewater. 21st Edition, American Public Health Association, Washington DC.
[15] Li, M. and Li, W. (2009) Review on Carbon Cycle of Wetland Ecosystem. Huazhong Agri. Univ., 28, 116-123.