海南岛和厦门红树林湿地CH_4排放的时空变化

Seasonal and Spatial Changes of Methane Emissions from Mangrove Wetlands in Hainan Island and Xiamen

研究了海南岛和厦门的河口海岸红树林湿地、海岸光滩及红树林伐迹地CH4排放的时空变化。海南岛长宁站位海莲林连续两年的CH4排放率均表现为外滩 >中滩 >内滩的空间变化模式 ,与土壤含水量的空间变化一致 ,而与土壤盐度的空间变化相反 ;但 1997年在其余五个红树林湿地的CH4排放率表现出不同的空间变化规律 ,且大多与土壤理化因子不呈对应关系。各红树林湿地的最低CH4排放率均出现在冬季。红树林湿地年CH4排放率高于海岸光滩而低于红树林伐迹地。

Seasonal and spatial changes of methane emissions from mangrove wetlands along estuary and marine coasts were studied in Hainan Island and Xiamen The same spatial pattern of methane emission rates, out-flat>mid-flat>inner-flat, was observed in the Bruguiera sexangula mangrove wetland at Site Changning during 1996 and 1997, similar to that of soil moistures and opposite to that of soil salinity However, in 1997, spatial patterns of methane emission rates were different among the other five mangrove wetlands The minimum methane emission rates occurred in winter in all mangrove wetlands Methane emission rates from mangrove wetlands were higher than that from coastal barren flat and lower than that from mangrove clearing plot