长江流域资源与环境 >> 2024, Vol. 33 >> Issue (5): 1018-1028.doi: 10.11870/cjlyzyyhj202405010

• 自然资源 • 上一篇    下一篇

南充市城市表层土壤可溶性有机碳、氮分布特征

王建,刘金胜,傅裕*,杜子银,代清林   

  1. (西华师范大学地理科学学院,四川 南充 637009)
  • 出版日期:2024-05-20 发布日期:2024-05-29

Distribution Characteristics of Soluble Organic Carbon and Nitrogen in Urban Topsoil of Nanchong City

WANG Jian, LIU Jin-sheng, FU Yu, DU Zi-yin, DAI Qing-lin   

  1. (School of Geography, China West Normal University, Nanchong 637009,China)
  • Online:2024-05-20 Published:2024-05-29

摘要: 土壤可溶性碳、氮在城市生态系统碳、氮循环中扮演着重要角色。为了解城市土壤可溶性有机碳、氮的分布特征,以南充市城市土壤为研究对象,多视角分析了城市土壤可溶性有机碳、氮的分布特征。结果表明:南充市表层城市土壤可溶性有机碳含量在99.84~188.13 mg·kg-1之间,土壤可溶性有机氮含量在7.57~75.09 mg·kg-1之间,二者均随土壤深度的增加而降低;土壤可溶性有机碳、氮在不同植被类型下差异均显著,前者表现为:常绿林 > 草本 > 落叶林 > 灌木,后者从大到小依次为常绿林、落叶林、灌木、草本;防护绿地、附属绿地、道路绿地、街头绿地、公园绿地五种绿地类型城市土壤可溶性有机碳差异显著,其均值依次增大,而土壤可溶性有机氮在不同绿地类型间差异不显著;不同城市功能区绿地土壤可溶性有机碳、氮差异均达到极显著水平,前者从大到小依次为文教区、商业区、工业区、居住区,后者表现为:文教区 > 商业区 > 居住区 > 工业区;城市土壤利用年限越久,土壤可溶性有机碳、氮含量越高,但这种差异在不同利用年限间均不显著。城市土壤可溶性有机碳、氮在不同植被类型、绿地类型、功能区和利用年限下的差异是自然与人为因素交互作用的结果。

Abstract: Soil soluble carbon and nitrogen play an important role in carbon and nitrogen cycle of urban ecosystem.In order to understand the distribution characteristics of soluble organic carbon and nitrogen in urban soil, this study took urban soil in Nanchong as the research object, and conducted relevant studies from multiple perspectives.The results showed that the contents of soil soluble organic carbon in surface urban soil was between 99.84 and 188.13 mg·kg-1, and the contents of soil soluble organic nitrogen was between 7.57 and 75.09 mg·kg-1, both of which decreased with soil depth.There existed significant differences in soil soluble organic carbon and nitrogen under different vegetation types, eg.the former followed an order of evergreen forest > herbaceous > deciduous forest > shrub, and the latter decreased significantly in the order of evergreen forest, deciduous forest, shrub, and herbaceous.There was a significant difference in soluble organic carbon in urban soil among the five types of green space with a decreasing order of protective green space, affiliated green space, road green space, street green space, and park green space.However, there was no significant difference in soil soluble organic nitrogen among the different types of green space.The differences in soluble organic carbon and nitrogen in the soils of green space in different urban functional areas were at extremely significant levels.The former decreased in the order of cultural and educational area, commercial area, industrial area, and residential area, while the latter followed an order of cultural and educational area > commercial area > residential area > industrial area.The longer the urban soil was used, the higher the contents of soluble organic carbon and nitrogen in the soil, however, these differences were not significant through the years.The differences in soluble organic carbon and nitrogen in urban soil under different vegetation types, green space types, functional zones, and utilization years were the consequence of the interaction between the natural and human factors.

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