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。
To investigate the effect of Spartina alterniflorainvasion on soil organic carbon fractions and the stability of soil,the soil samples were collected from wetlands of mangroves and invasive species S.alterniflora（before invasion was mangrove forest）in the Zhangjiangkou Estuary,Jiulong River Estuary and Min River Estuary of Fujian,and Yueqing Bay of Zhejiang.The contents of soil organic carbon（SOC）,soil organic carbon storage（SOCS）,active organic carbon fractions（microbial biomass carbon-MBC,easily oxidized organic carbon-EOC and water soluble organic carbon-WSOC）and chemical bonded organic carbon components（calcium bonded organic carbon（Ca—SOC）and iron-aluminum bonded organic carbon（Fe（Al）—SOC））were measured in laboratory.These results showed that compared with the mangrove,soil SOC,SOCS,MBC and EOC contents decreased after S.alterniflorainvasion,especially SOC and SOCS,their reduction rates were about 9.86%-27.13% and 13.95%-26.29%,respectively.While,soil WSOC content had increased by5.75%-53.52%.Soil chemical bonded organic carbon components were also influenced by S.alterniflora invasion.The ratio of Ca—SOC/SOC increased,while the ratio of[Fe（Al）—SOC＋residual state SOC]/SOC decreased.These results indicated that S.alterniflora invasion not only changed the soil organic carbon pool,but also changed its stability.The chemical bond of soil organic carbon might be the main protective mechanism for the soil organic carbon stability in mangrove wetland,which was important for mangrove carbon sink function.
作者
陈桂香
高灯州
陈刚
曾从盛
王维奇
CHEN Guixiang;GAO Dengzhou;CHEN Gang;ZENG Congsheng;WANG Weiqi(College of Geographical Sciences, Fujian Normal University, Fuzhou 350007;Reserach Centre of Wetlands in Subtropical Region, Fuzhou 350007;Key Laboratory of Humid Sub-tropical Eco-geographical Process, Ministry of Education, Fuzhou 350007)
出处
《水土保持学报》
CSCD
北大核心
2017年第6期249-256,共8页
Journal of Soil and Water Conservation
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
关键词
互花米草入侵
红树林
有机碳
有机碳组分
有机碳稳定性
Spartina alterniflora invasion
mangrove
organic carbon
organic carbon fraction
organic carbon stability
