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城市化梯度带绿地土壤碳氮的空间分布特征

安吉1,李婷1*,傅翔1,张世熔2,李智平1,魏巍1   

  1. (1四川农业大学资源学院, 成都 611130;2四川农业大学环境学院, 成都 611130)
  • 出版日期:2019-09-10 发布日期:2019-09-10

Spatial distribution of soil carbon and nitrogen in green lands along an urbanization gradient.

AN Ji1, LI Ting1*, FU Xiang1, ZHANG Shi-rong2, LI Zhi-ping1, WEI Wei1   

  1. (1College of Resources, Sichuan Agricultural University, Chengdu 611130, China; 2College of Environment, Sichuan Agricultural University, Chengdu 611130, China).
  • Online:2019-09-10 Published:2019-09-10

摘要: 城市化导致自然用地和农业用地向城市用地转变,频繁而持续的人为干扰导致城市绿地土壤有机碳和全氮含量分布发生空间分异。本文以成都温江这一典型的“中心城-郊区-卫星城”梯度带为研究区,采用滑动窗口分析法,根据建筑密度、道路密度和距城市中心距离等指标,探究城市发展对绿地土壤有机碳、全氮空间分布的影响。结果表明:土壤有机碳、全氮平均含量以及碳氮比均值分别为15.80 g·kg-1、1.24 g·kg-1和13.04;土壤有机碳、全氮含量在“中心城-郊区-卫星城”样带呈先降低后增加趋势;不同绿地类型土壤有机碳、全氮含量无显著性差异(P>0.05),但公园绿地土壤的碳氮比显著高于交通绿地(P<0.05);土壤有机碳、全氮含量随距城市中心距离增加呈显著指数降低趋势(P<0.05);样带内土壤有机碳含量随建筑密度和道路密度增加呈显著线性增加趋势(P<0.05);全氮含量与建筑密度无显著相关关系,但随道路密度增加呈显著线性增加趋势(P<0.05);碳氮比与距城市中心距离、建筑密度和道路密度均无显著相关性。该研究结果揭示了城市发展有利于土壤有机碳和全氮的累积,距城市中心距离、建筑密度和道路密度不同程度上影响土壤有机碳和全氮的空间分布。

关键词: 土壤, 球囊霉素, 丛枝菌根真菌, 环境功能

Abstract: Urbanization leads to the transformation of natural lands and agricultural lands to urban lands. The concentrations of soil organic carbon (SOC) and total nitrogen (TN) in urban green lands vary spatially due to frequent human disturbance. This study, conducted in a typical “central city suburban satellite city” gradient in ChengduWenjiang, aimed to evaluate the impacts of urban development on the spatial distribution of SOC and TN by using the indices of building density, road density, and distance from urban center. The results showed that mean values of SOC and TN concentrations and carbon-nitrogen ratio (C/N) were 15.80 g·kg-1, 1.24 g·kg-1 and 13.04, respectively. The concentrations of SOC and TN decreased from central city to suburb, and then increased from suburb to satellite city. Green land types showed no variation in the concentrations of SOC and TN (P>0.05), but the C/N in park green land soil was significantly higher than that in traffic green land (P<0.05). The concentrations of SOC and TN significantly exponentially decreased with the distance from the central city (P<0.05). Concentrations of SOC significantly linearly increased with the increases of building density and road density (P<0.05). Concentrations of TN showed no significant correlation with building density, but significantly linearly increased with the increases of road density (P<0.05). There was no significant correlation between C/N and distance from urban center, building density, and road density. Our findings reveal that urban development may result in accumulation of SOC and TN. The distance from urban center, building density and road density differentially impact the spatial distribution of SOC and TN.

Key words: soil, glomalin, arbuscular mycorrhizal fungi, environmental function