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生态学杂志 ›› 2020, Vol. 39 ›› Issue (12): 4038-4047.doi: 10.13292/j.1000-4890.202012.025

• 研究报告 • 上一篇    下一篇

南充市“城-郊-乡”梯度绿地土壤碳氮磷生态化学计量特征

傅裕,杨霞,王建*   

  1. (西华师范大学国土资源学院, 四川南充 637009)
  • 出版日期:2020-12-10 发布日期:2021-06-10

Stoichiometric characteristics of soil C, N and P of green space along an urbans uburb rural gradient in Nanchong.

FU Yu, YANG Xia, WANG Jian*   

  1. (Schod of Land and Resources, China West Normal University, Nanchong 637009, Sichuan, China).
  • Online:2020-12-10 Published:2021-06-10

摘要: 城市化进程中强烈的人为干扰活动导致城市绿地土壤碳(C)、氮(N)、磷(P)含量及其生态化学计量平衡特征在空间上发生分异。本研究选取南充市主城区“城-郊-乡”梯度下7个不同距离区域(以五星花园为中心)的绿地土壤为对象,采集0~10 cm和10~20 cm土层的土壤样品,测定其有机碳(SOC)、全氮(TN)、全磷(TP)的含量并分析其生态化学计量特征。结果表明:南充市主城三区绿地土壤SOC、TP含量在沿“城-郊-乡”梯度下总体随距城市中心距离增加呈显著降低趋势,而TN在“城-郊-乡”梯度下变化不明显;随着土层加深,各距离区域绿地土壤SOC、TN和TP含量均减少,其中以SOC和TN降低幅度最大。沿“城-郊-乡”梯度,绿地土壤C∶N和C∶P在南充主城区呈现降低趋势,且均明显低于国内平均水平;而绿地土壤N∶P在“城-郊-乡”梯度下有增加的趋势,但仍低于国内平均水平。与中国非城市土壤的平均水平相比,南充城市土壤C、N、P比例严重失衡。

关键词: “城-郊-乡”梯度, C∶N∶P, 生态化学计量比, 南充市

Abstract: Strong human activities due to urbanization have led to the spatial differentiation of soil carbon (C), nitrogen (N), phosphorus (P) concentrations and their ecological stoichiometry in green space. With soil samples at the depth of 0-10 cm and 10-20 cm being collected fromseven sites (centered on Wuxing Garden) along an urban-suburb-rural gradient in Nanchong, we analyzed the concentrations and ecological stoichiometry of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP). The results showed that the concentrations of SOC and TP in the green space soil had a decreasing tendency with the increase of distance from the downtown, while TN concentration showed no significant variation. The concentrations of SOC, TN and TP decreased with increasing soil depth in the green space of each site, with stronger trend for SOC and TN. Soil C∶N and C∶P of green space, obviously lower than average value at national level, tended to decrease along the urban-suburb-rural gradient. Soil N∶P of green space, which was lower than the average value at national level, had an increasing tendencyalong the urban-suburb-rural gradient. Compared to the average value of non-urban soil at national level, the stoichiometry of C, N and P were seriously imbalanced in the urban soils of Nanchong.

Key words: urban-suburb-rural gradient, C∶N∶P, ecological stoichiometry, Nanchong.