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生态学杂志 ›› 2020, Vol. 39 ›› Issue (9): 3011-3020.doi: 10.13292/j.1000-4890.202009.007

• 研究报告 • 上一篇    下一篇

辽河口不同类型湿地土壤碳氮磷生态化学计量学特征

刘玥,杨继松*,于洋,李晓,赵心怡,于君宝,吕振波     

  1. (鲁东大学资源与环境工程学院滨海生态高等研究院, 山东烟台 264025)
  • 出版日期:2020-09-10 发布日期:2021-03-10

Stoichiometric characteristics of carbon, nitrogen and phosphorus of soil in the Liaohe estuary wetlands.


LIU Yue, YANG Ji-song*, YU Yang, LI Xiao, ZHAO Xin-yi, YU Jun-bao, LU Zhen-bo

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#br#  Zhenbo #br#   

  1. (Institute for Advanced Study of Coastal Ecology, School of Resources and Environmental Engineering, Ludong University, Yantai 264025, Shandong, China).
  • Online:2020-09-10 Published:2021-03-10

摘要: 为阐明不同类型湿地土壤碳氮磷生态化学计量特征,以辽河口湿地为研究对象,对自然芦苇湿地、油田区芦苇湿地、退化芦苇湿地、碱蓬湿地、滩涂和稻田等六类湿地的土壤有机碳(TOC)、全氮(TN)、全磷(TP)含量及其生态化学计量学特征进行测定和分析。结果表明,辽河口湿地土壤TOC、TN、TP含量分别为1.612~167.832、0.159~4.452和0.021~0.093 g·kg-1,其含量因湿地类型和土壤深度而异。自然芦苇湿地和油田区芦苇湿地土壤TOC含量较高,自然芦苇湿地和稻田土壤TN含量较高,而碱蓬湿地、滩涂TOC和TN含量较低;不同类型湿地表层土壤(0~10 cm)TOC和TN含量显著高于下层土壤(10~40 cm)。TP含量在不同类型湿地和不同深度土壤间均无明显差异(P>0.05)。C/N、C/P、N/P值分别为28、364和13,在不同类型湿地中差异显著(P<0.05)。相关分析表明,TOC、TN与C/P、N/P呈正相关,电导率(EC)与土壤TOC、TN、TP、C/N、C/P和N/P呈弱的负相关。研究表明,盐度增加可能会削弱土壤中氮磷等营养元素对碳累积过程的控制,引起湿地土壤的碳损失。

关键词: 碳, 氮, 磷, 化学计量特征, 辽河口湿地

Abstract: The stoichiometric characteristics of carbon (C), nitrogen (N), phosphorus (P) and their ratios (C/N, C/P and N/P) are important for understanding organic matter dynamics in wetland ecosystems and ecosystem response to environmental changes. The aim of the study was to reveal the differences of TOC, TN, TP and their ratios among different wetlands in the Liaohe estuary, and to find the factors affecting the stoichiometric characteristics of C, N and P. We selected six types of wetland in Liaohe estuary, including natural Phragmites australis wetland, P. australis wetland of oilfield, degraded P. australis wetland, Suaeda salsa wetland, mudflat, and rice paddy. The results showed that the contents of TOC, TN and TP in soil ranged from 1.612 to 167.832, 0.159 to 4.452 and 0.021 to 0.093 g·kg-1 at different depths across the six wetland types, respectively. Those values were different among soil depths and wetland types (P<0.05). Higher contents of TOC were found in the natural P. australis wetland and P.australis wetland of oilfield, while higher TN contents were observed in the natural P.australis wetland and rice paddy. Lower TOC and TN were found in the Suaeda salsa wetland and mudflat. The TOC and TN contents in the top soil (0-10 cm) of different wetland types were significantly higher than those in the subsoil (10-40 cm). There were no significant differences in TP contents among different wetland types and among different soil depths (P>0.05). The mean values of C/N, C/P and N/P ratios were 28, 364 and 13 across different wetland types, respectively, which were significantly different among wetlands (P<0.05). Correlation analysis results showed that TOC and TN contents were positively correlated with C/P and N/P, and EC values were weakly negatively correlated with soil TOC, TN, TP, C/N, C/P and N/P. Our results suggest that increasing salinity might weaken the control of N and P on the C accumulation in soil, resulting in carbon loss.

Key words: carbon, nitrogen, phosphorus, stoichiometric characteristics, Liaohe estuarine wetland.