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土壤水溶性有机碳(WSOC)是土壤碳循环最活跃的组成部分之一。土地利用方式的改变可能显著影响土壤有机碳的组成和结构,进而影响到大气与土壤间的碳交换。本研究以苏北沿海地区农田、杨农复合经营、杨树纯林以及草地等4种不同土地利用方式土壤为研究对象,采用TOC-VCPN总有机碳仪测定了4种不同土地方式下土壤WSOC含量的变化。分析了土壤WSOC与土壤总有机碳(TOC)、易氧化碳(ROC)及理化性质的相关关系。结果表明:WSOC和TOC、土壤全氮(TN)、ROC呈显著正相关,与碳氮比、pH、土壤容重呈显著负相关;WSOC的含量随土层的加深而减少,与总有机碳的变化特征一致,在各个土层,不同土地利用方式WSOC含量差异不显著;农田和草地的WSOC含量在0～10cm土层与10～25cm土层之间差异显著(P<0.05),杨农复合经营的WSOC含量在10～25cm土层与25～40cm土层之间差异显著(P<0.05),其他3种类型差异不显著。
Soil water-soluble organic carbon (WSOC) is one of the most active components of the soil carbon cycle. Changes in land use patterns may significantly affect the composition and structure of soil organic carbon, which in turn affects the carbon exchange between the atmosphere and the soil. In this study, four different land-use types of soils, such as farmland, mixed farming of poplar, poplar pure forest and grassland, were studied in the coastal areas of northern Jiangsu Province. TOC-VCPN total organic carbon was used to determine soil WSOC content in four different land types Variety. The relationship between soil WSOC and soil total organic carbon (TOC), carbon dioxide (ROC) and physical and chemical properties was analyzed. The results showed that there was a significant positive correlation between WSOC and TOC, soil total nitrogen (TN) and soil organic carbon (ROC), and negatively correlated with carbon and nitrogen ratio, pH and soil bulk density. WSOC content decreased with soil depth and decreased with total organic carbon There was no significant difference in WSOC content between different land use types in different soil layers. The content of WSOC in farmland and grassland was significantly different between 0 ~ 10cm soil layer and 10 ~ 25cm soil layer (P <0.05) The content of WSOC in operation was significantly different between soil layer of 10 ~ 25cm and soil layer of 25 ~ 40cm (P <0.05), while the other three types showed no significant difference.