基于不同分类方法的城市土壤碳氮定量关系模型的建立

以深圳城市中心城区绿地土壤为研究对象,对表层0～20cm 土壤理化性状进行了系统调查分析.在此基础上.按调查总体、土壤酸碱度类别、土壤质地类别和土地利用类别等不同角度,建立了土壤有机碳(SOC)、全氮(TN)、有效态氮(AN)相互之间的定量相关关系模型,并通过数据验证,对不同模型进行了筛选.结果表明,SOC、TN及AN含量之间均有密切的关系,尽管传统的总体线性关系模型可以表达SOC、TN、AN之间的关系,但通过土壤类别分类建立的模型更为准确.

Modeling of Quantitative Carbon-Nitrogen Relationship in Urban Soils Based on Different Classification Methods

The relationship of soil organic matter (SOC), with soil total nitrogen (TN) and soil available nitrogen (AN) in content was modeled based on the data acquired from an investigation of physical and chemical properties of urban soil in a green space in the centre of Shenzhen City, China. Models were established from the angle of the overall survey, soil pH levels, soil texture types and land-use patterns and screened through data validation. Results showed that SOC was closely related to TN and AN. Though the traditional model of a general linear relationship was adequate to demonstrate the relationship of SOC with TN and AN, models established based on classification of soil types and landuse types were more accurate.