互花米草入侵对我国红树林湿地土壤碳组分的影响

发布时间：2018-03-27 07:50

本文选题：互花米草入侵　切入点：红树林　出处：《水土保持学报》2017年06期

【摘要】：以福建漳江口、九龙江口、闽江口和浙江乐清湾为研究区,采集红树林和入侵种互花米草(入侵前为红树林)湿地土壤样品,分析互花米草入侵后土壤有机碳(SOC)、有机碳储量(SOCS)、活性有机碳组分(微生物生物量碳MBC、易氧化有机碳EOC、水溶性有机碳WSOC)以及有机碳键合组分(钙键结合有机碳(Ca—SOC)和铁铝键结合有机碳(Fe(Al)—SOC))的变化,探讨互花米草入侵对土壤有机碳组分以及稳定性的影响。结果表明:互花米草入侵红树林后,土壤SOC、SOCS、MBC和EOC总体上有所降低,尤其是SOC和SOCS,其降低的比例分别约为9.86%~27.13%和13.95%~26.29%;土壤WSOC含量则增加,增加比例约为5.75%~53.52%;互花米草入侵对土壤有机碳键合组分也具一定的影响,其中Ca—SOC/SOC比值增加,而[Fe(Al)—SOC+残渣态SOC]/SOC比值降低。这些结果预示着互花米草入侵改变了土壤有机碳库,同时也一定程度削弱了土壤有机碳稳定性。土壤有机碳的化学键合可能是红树林湿地土壤有机碳稳定的主要保护机制,对红树林碳汇功能具有重要意义。
[Abstract]:Taking Zhangjiang Estuary, Jiulong River Estuary, Minjiang River Estuary and Yueqing Bay of Zhejiang Province as study areas, the soil samples of mangrove and invasive species Spartina alterniflora (mangrove before invasion) were collected. Soil organic carbon (SOC), organic carbon storage (SOCSC), microbial biomass carbon (MBC), easily oxidized organic carbon (EOC), water-soluble organic carbon (WSOC), organic carbon bond (Ca-SOC) and organic carbon (Ca-SOC) were analyzed after Spartina alterniflora invasion. The change of Fe-Al bond binding to organic carbon (FE-Al-SOC _ (C)), The effects of Spartina alterniflora invasion on soil organic carbon composition and soil stability were studied. The results showed that soil SOC C C C and EOC decreased after Spartina alterniflora invaded mangrove forest. Especially for SOC and SOC, the decrease rates were about 9.86% and 13.95%, respectively, and the content of WSOC in soil increased by 5.75% and 53.52%, respectively. The invasion of Spartina alterniflora also had some effect on the organic carbon bond composition of soil, in which the ratio of Ca-SOC/SOC increased. The ratio of [Fe(Al)-SOC residue SOC] / SOC decreased. These results indicate that Spartina alterniflora invasion changed the soil organic carbon pool. The chemical bond of soil organic carbon may be the main protection mechanism of soil organic carbon stability in mangrove wetland, which is of great significance to the carbon sink function of mangrove forest.
【作者单位】：福建师范大学地理科学学院;福建师范大学亚热带湿地研究中心;湿润亚热带生态—地理过程教育部重点实验室;
【基金】：中国沼泽湿地资源及其主要生态环境效益综合调查项目(2013FY111800) 国家基础科学人才培养基金项目(J1210067) 福建师范大学地理科学学院研究生科研创新基金项目
【分类号】：S714

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