浙南乐清湾滨海湿地重金属分布对土壤碳组分的影响

吴雪; 赵鑫; 孙鸿程; 辜伟芳; 朱科桦; 葛振鸣

doi:10.3969/j.issn.1001-909X.2025.03.011

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海洋学研究 ›› 2025, Vol. 43 ›› Issue (3) : 110-122. DOI: 10.3969/j.issn.1001-909X.2025.03.011

研究报道

浙南乐清湾滨海湿地重金属分布对土壤碳组分的影响

吴雪 ¹ ,
赵鑫 ¹^,^* ,
孙鸿程 ¹ ,
辜伟芳 ¹ ,
朱科桦 ² ,
葛振鸣 ²

作者信息 +

Influence of soil heavy metal distribution on carbon components in the coastal wetlands of Yueqing Bay in southern Zhejiang Province

WU Xue ¹ ,
ZHAO Xin ¹^,^* ,
SUN Hongcheng ¹ ,
GU Weifang ¹ ,
ZHU Kehua ² ,
GE Zhenming ²

Author information +

文章历史 +

摘要

滨海湿地生态系统具有重要的碳汇功能。人类生活和工农业生产会向湿地输入重金属,但其对湿地土壤不同碳组分的影响尚不清楚。本研究通过对比浙南乐清湾不同类型滨海湿地的土壤碳组分含量以及方差分析发现:成林红树林、幼林红树林、互花米草盐沼和光滩的土壤有机碳(soil organic carbon, SOC)、易氧化有机碳(easily oxidized organic carbon, EOC)和可溶性有机碳(dissolved organic carbon, DOC)含量呈显著的区域和生境间差异;土壤总碳(soil total carbon, STC)和微生物生物量碳(microbial biomass carbon, MBC)含量在不同区域间具有显著差异。通过湿地土壤重金属的空间分布可知,临近企业和居民区(高干扰区)的湿地土壤Cd、Pb和Hg含量显著高于低干扰区域,高干扰区的湿地STC、SOC和EOC含量低于低干扰区。通过冗余分析发现:互花米草盐沼STC、SOC和EOC含量与Hg、Cd含量呈显著负相关,成林红树林SOC和EOC含量与Pb、Zn含量呈显著负相关,幼林红树林STC、SOC和EOC含量与Pb、Cr含量呈显著负相关,光滩STC、SOC和EOC含量与Cd、Cr含量呈显著负相关,这反映了重金属含量升高会对土壤碳库产生负面影响;土壤MBC含量与部分重金属含量呈显著正相关关系,这表明滨海湿地土壤微生物群落对于部分低含量重金属有一定的适应性。本研究结果可为浙江省滨海湿地环境质量评估与自然碳汇管理提供科学依据。

Abstract

Coastal wetland ecosystems have important carbon sink function. Human life, industrial and agricultural production will input heavy metals into wetlands, however, the impacts of heavy metals on various soil carbon components are still unclear. Based on the comparison of the soil carbon component content in the different types of coastal wetlands in Yueqing Bay of southern Zhejiang Province, it was found that the contents of soil organic carbon (SOC), easily oxidizing organic carbon (EOC) and dissolved organic carbon (DOC) in the adult mangroves, young mangroves, Spartina alterniflora salt marshes and mudflats presented the significant regional and inter-habitat differences. Soil total carbon (STC) and microbial biomass carbon (MBC) presented the significant regional differences. By monitoring the spatial distribution of heavy metals, the results showed that the contents of Cd, Pb and Hg in the coastal wetlands adjacent to industrial/agricultural lands and residential area were higher than those in the non-disturbed areas. Correspondingly, the contents of STC, SOC and EOC of the high-disturbed wetlands were lower than those of the non-disturbed wetlands. Furthermore, the results of redundancy analyses (RDA) showed that the STC, SOC and EOC contents were significantly negatively correlated with the Hg and Cd content in the S. alterniflora salt marshes; the SOC and EOC contents were significantly negatively correlated with the Pb and Zn contents in the adult mangroves; the STC, SOC and EOC contents were significantly negatively correlated with the Pb and Cr contents in the young mangroves; and the STC, SOC and EOC contents were significantly negatively correlated with the Cd and Cr contents in the mudflats. This reflects that the increased heavy metals might cause a negative impact on the soil carbon pool. However, the RDA analysis indicated that the MBC content was positively correlated with some heavy metals, probably reflecting the adaptability of the microbial community in the coastal wetland to the low content of heavy metals. The results of this study can provide scientific basis and data support for the environmental quality assessment and natural carbon sink management of coastal wetlands in Zhejiang Province.

导出引用

吴雪, 赵鑫, 孙鸿程, 等. 浙南乐清湾滨海湿地重金属分布对土壤碳组分的影响[J]. 海洋学研究. 2025, 43(3): 110-122 https://doi.org/10.3969/j.issn.1001-909X.2025.03.011

WU Xue, ZHAO Xin, SUN Hongcheng, et al. Influence of soil heavy metal distribution on carbon components in the coastal wetlands of Yueqing Bay in southern Zhejiang Province[J]. Journal of Marine Sciences. 2025, 43(3): 110-122 https://doi.org/10.3969/j.issn.1001-909X.2025.03.011

中图分类号： S153.6;X53

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