合肥市不同绿地类型土壤溶解性有机碳变化规律

为探讨绿地类型及植被配置模式对城市土壤碳动态的影响,以合肥市绿地土壤为研究对象,分析了不同绿地类型(公园绿地、居住区绿地、道路绿地、工厂绿地、校园绿地)不同植被配置模式下土壤溶解性有机碳质量分数变化规律.结果表明:研究区内土壤溶解性有机碳平均质量分数随土层深度的增加而降低,0～ 10 cm、10～20 cm、20 ～ ...

Changing Regularity of Dissolved Organic Carbon in Soil Under Different Types of Urban Green Space in Hefei

Soil samples were collected from six different types of green space in Hefei,East China,including suburban forest park,green land of residential area,roadside green space,campus green space,park green space,and factory green space.The change in content of Dissolved Organic Carbon(DOC) in soil under different types of urban green space was analyzed in order to increase the understanding of the impact of land use types and planting modes on carbon dynamics in urban soil,and to determine the relationships between DOC and other soil nutrients.Results suggested that the content of DOC decreased with soil depth,with average contents of 33.12 mg·kg-1 in 0-10 cm,28.89 mg·kg-1 in 10-20 cm and 25.57 mg·kg-1 in 20-30 cm.The content of DOC in Shushan forest park(44.28 mg·kg-1) was the highest,followed by campus green space(29.84),park green space(28.39),green land of residential area(26.82),roadside green space(26.72),and factory green space(22.88).Planting modes also significantly impacted the content of DOC(P<0.05).The highest content of DOC was observed in the soil under arbor-herb mode,with an average of 44.96 mg·kg-1 in 0-30 cm.Land use change resulted in an obvious variation in content of DOC in soil(0-30 cm) across the environmental gradient.The correlation analysis indicated that soil DOC content was positively correlated with soil moisture and NH+4-N content,and significantly negatively correlated with pH(H2O),pH(KCl),bulk density,electrical conductivity,and total phosphorus content.