Variability of Soil Microbial Respiration Under Different Vegetation Succession Stages in Jiuduansha Wetland

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Variability of Soil Microbial Respiration Under Different Vegetation Succession Stages in Jiuduansha Wetland

Desalination and Water Treatment 32 (2011) 277–283 www.deswater.com August 1944-3994 / 1944-3986 © 2011 Desalination Publications. All rights reserved. doi: 10.5004/dwt.2011.2711 Variability of soil microbial respiration under different vegetation succession stages in Jiuduansha wetland Yushu Tang, Lei Wang*, Jianwei Jia, Yanli Li, Wenquan Zhang, Hongli Wang, Xiaohua Fu, Yiquan Le State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China Tel. +86 (21) 65989079; Fax +86 (21) 65989079; email: [email protected], [email protected] Received 27 July 2010; Accepted in revised form 20 January 2011 abstract The soil microbial respiration (SMR) and physicochemical characteristics of Jiuduansha wetland at the Yangtze Estuary were analyzed in order to clarify the variability of SMR under different vegetation succession stages and its influencing factors. The results indicated that SMR of different vegetation succession stages are significantly various (P < 0.05). The SMR of the Spartina alterniflora –1 –1 (S. alterniflora) zone (0.43 mgCO2.g .24 h ) was the highest. These findings implied thatS. alterniflora could enhance the SMR. Based on both the SMR and input of organic matter from plant decay, the Phragmites australis (P. australis) community likely possesses a higher organic carbon accumulation capability. Considering both SMR and input of organic matter from decayed plant biomass of wetland with different vegetation type, theP. australis community, in theory, has higher organic carbon accumulation capability. Path analysis shows that the main bio-factors influencing on SMR include bacterial diversity and soil microbial biomass (SMB). Soil moisture, inorganic N (IN), salinity and available P (AP) in soil also have significant effects on the mentioned biological factors. Keywords: Path analysis; Carbon sink; Vegetation type; Salt marsh wetland * Corresponding author..

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