论文部分内容阅读
为了解城市化过程中人为活动对城市林业土壤性质及土壤碳库的影响,以南京市土壤为对象,测定了7类功能区城市林业土壤0~30 cm土层的总有机碳(SOC)、溶解有机碳(DOC)、微生物量碳(MBC)、易氧化态碳(ROC)和轻组有机碳(LFOC)的含量,分析了城市林业土壤有机碳的分布规律及其相互关系。结果表明:城市林业土壤表层(0~10 cm)活性有机碳富集特征明显,土壤活性有机碳含量随着土层加深而减小,人为干扰对土壤有机碳含量影响较大;城郊天然林土壤积累了较高含量的ROC和MBC,道路绿化带土壤由于交通源有机物质的输入,SOC、DOC、LFOC含量较高。人类活动频繁的居民区、公园和校园的土壤活性有机碳各组分含量多处于较低水平。研究表明,土壤总有机碳与各活性有机碳之间有显著相关关系。
In order to understand the effect of anthropogenic activities on urban forestry soil properties and soil carbon pool in urbanization process, the total organic carbon (SOC) of 0 ~ 30 cm soil layer of urban forestry in seven functional areas in Nanjing City were measured. The contents of dissolved organic carbon (DOC), microbial biomass carbon (MBC), readily oxidizable carbon (ROC) and light organic carbon (LFOC) were analyzed to analyze the distribution and correlation of soil organic carbon in urban forestry. The results showed that the active organic carbon in the surface layer of urban forestry (0 ~ 10 cm) was obviously enriched, the content of soil active organic carbon decreased with the deepening of the soil layer, and anthropogenic disturbance had a great influence on the soil organic carbon content. Accumulation of higher contents of ROC and MBC resulted in higher SOC, DOC, and LFOC contents in road greenbelts due to the input of organic matter in traffic sources. The content of soil active organic carbon in residential areas, parks and campuses with frequent human activities is at a low level. The results show that there is a significant correlation between soil total organic carbon and each active organic carbon.