›› 2011, Vol. 23 ›› Issue (6): 0-1209.

• 环境科学 •    

Effects of different management practices on soil respiration of Phragmites communities in Yangtze River reclaimed wetlands

YANG Shuhui;REN Wenling;ZHONG Qicheng;WANG Kaiyun*;ZHANG Chao   

  1. School of Resources and Environmental Science, East China Normal University, Key Laboratory of Urbanization and Ecological Restoration, Shanghai 200062, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-11-25 Published:2011-11-25

Abstract:

Mowing and straw returning of Phragmites are two main management practices in the wetland ecosystem. A field experiment was conducted at Dongtan wetland, Chongming Island near Yangtze River estuary to determine the effects of different management practices on soil respiration of wetland ecosystem. The results indicated that late winter mowing and straw returning significantly increased the strength of soil respiration, whereas early winter mowing and no straw returning significantly reduced the strength of soil respiration. There was an exponential relationship (P<005) between soil respiration and soil temperatures. Correlation coefficients between soil respiration and soil moisture were lower than that between soil respiration and soil temperatures. A combination of soil temperature and moisture could explain 88%-93% of the variability in soil respiration. The results of this study showed that management practices could markedly affect soil carbon emissions in the wetland ecosystem.

Key words: management practices, Yangtze River reclaimed wetlands, Phragmites communities, soil respiration