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采用VarioELIII型元素分析仪,2007年7月分析了福州城市沿江3种土地覆被类型(芦苇湿地以及草坪和片林)土壤有机碳(SOC)与轻组有机碳(LFOC)的垂直分布特征.结果表明:3种土地覆被类型SOC和LFOC含量均表现为在土壤表层富集并向下层递减的趋势,且人工绿地在土壤剖面(0～60cm)不同层次的SOC和LFOC含量均显著高于沿江芦苇湿地,其中,草坪0～20cm土层的SOC含量显著高于片林;沿江芦苇湿地转为草坪和片林后,其SOC储量分别增加了94.8%和72.0%,LFOC储量分别增加了225%和93%;城市沿江湿地转变为城市人工绿地后,因植物物种、密度以及周期性人工管理等变化,使土壤质量得以改善、SOC和LFOC储量增加,其中LFOC对土地覆被变化的响应较SOC敏感,以表层(0～20cm)土壤LFOC受到土地利用/覆地变化的影响最大.
The VarioELIII elemental analyzer was used to analyze the vertical distribution of soil organic carbon (SOC) and light organic carbon (LFOC) in the three land cover types (reed wetland, lawn and patch forest) along the Fuzhou coast in July 2007. The results showed that SOC and LFOC contents of three land cover types all showed the tendency of enrichment in the soil surface and decreasing in the lower layer, and the contents of SOC and LFOC in different layers of the soil profile (0 ~ 60cm) In the reed wetland along the river, the SOC content of 0-20 cm soil layer in the lawn was significantly higher than that in the patch forest. After the reed wetland was reformed to turfgrass and patch forest, the SOC reserves increased by 94.8% and 72.0%, respectively, and the reserves of LFOC increased by 225% % And 93%, respectively. When the wetlands in the cities are transformed into urban artificial green land, the soil quality can be improved and SOC and LFOC reserves increase due to changes in plant species, density and periodical man-made management. Among them, the response of LFOC to land cover change SOC. The LFOC of topsoil (0 ~ 20cm) was the most affected by land use / cover change.