关键词: 管理措施, 长江口围垦湿地, 芦苇群落, 土壤呼吸

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