徐州市城区绿地土壤碳储量格局及养分特征

土壤碳储量及其分布格局,对于探讨城区绿地植被与土壤的关系,促进生态化城市建设和保证城市可持续发展意义重大。将城市宏观大尺度和土壤样地小尺度数据加以整合,对徐州市城区绿地土壤碳储量和格局及土壤养分特征进行了分析。结果表明:(1)城区绿地土壤pH值普遍呈碱性或弱碱性(pH值7.8～8.3),土壤有机质含量平均水平较低;(2)在相同土壤深度下,年代越久的城区绿地土壤碱性越弱,其与土壤有机碳含量之间存在明显负相关;(3)土壤碳密度和碳储量在0—60cm土层等间隔的含量随着土壤深度的增加呈现出梯度递减的趋势变化;(4)土壤有机碳的含量随着土壤深度的增加也呈现出逐渐递减的趋势变化。

The Pattern of Carbon Storage and Nutrient Characteristics of the Soil in the Greenbelt in Xuzhou City

Soil carbon storage and its distribution pattern are of great significance to understand relationship between the vegetation in greenbelt of city and soil and to promote ecological city construction and guarantee sustainable development of urban.Soil carbon storage pattern and soil nutrient characteristics of greenbelt of urban in Xuzhou City were analyzed by integrating the data for both the large city scale and soil sample scale.The results show that:(1) soil pH value in greenbelt of urban is generally alkaline or weak alkali(pH 7.8～8.3),average level of soil organic matter content is low;(2) in the same soil depth,there is weak alkaline in soil of greenbelt with the longer duration,which is obviously negatively relevant to soil organic carbon content;(3) soil carbon density and carbon storage in 0—60 cm soil depth decrease with increase of the soil depth;(4) soil organic carbon content is also showing gradually decreasing trend with the increase of the depth of soil.