闽江口围垦养殖对沉积物有机碳组分及其矿化的影响

发布时间：2018-02-19 17:55

本文关键词： 有机碳组分有机碳矿化围垦养殖闽江口　出处：《环境科学学报》2017年11期 　论文类型：期刊论文

【摘要】：研究滨海湿地围垦养殖后沉积物有机碳库的动态变化,对科学评估沿海滩涂湿地开发利用对碳库的影响具有重要意义.以闽江口鳝鱼滩湿地为研究区,采集不同围垦年限(3 a和15 a)养殖塘和短叶茳芏(Cyperus malaccensis)(养殖塘围垦前主要土著植被)湿地沉积物,测定其总有机碳(TOC)、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))及有机碳矿化特征,并基于时空互代法,分析了围垦养殖对沉积物TOC、有机碳组分及矿化的影响.结果表明:围垦养殖3 a,沉积物TOC和WSOC含量总体上没有显著变化,但围垦15a,表层(0~10 cm)沉积物TOC和WSOC含量显著增加,其增加比例分别约为68.36%和68.01%;围垦养殖后,沉积物MBC没有显著变化,EOC含量则有所降低,围垦15 a后表层沉积物EOC含量约降低37.35%.围垦养殖后表层沉积物有机碳矿化速率和累积矿化量均高于短叶茳芏湿地,而亚表层(10~20 cm)沉积物矿化速率差异不显著,且表层累积矿化量高于亚表层.养殖塘沉积物TOC及有机碳组分受长期水淹和饵料添加等管理方式的影响,同时受黏粒、TN和TP等理化性质的间接影响,进一步影响沉积物矿化速率、累积矿化量和潜在矿化量(C0).上述结果预示着滨海湿地围垦养殖在一定程度上增加了沉积物有机碳的蓄积,同时也促进了有机碳矿化.
[Abstract]:It is of great significance to study the dynamic changes of sediment organic carbon pool after reclamation and cultivation of coastal wetland, which is of great significance for the scientific evaluation of the impact of exploitation and utilization of coastal tidal flat wetland on carbon pool, taking the eel beach wetland in the mouth of Minjiang River as the research area. The wetland sediments of culture ponds and Cyperus malaccensis (the main indigenous vegetation before the cultivation of ponds) were collected for 3 years and 15 years. The mineralization characteristics of total organic carbon (TOC), organic carbon components (microbial biomass carbon (MBC), easily oxidized organic carbon (EOC), water-soluble organic carbon (WSOC)) and organic carbon were determined, and based on the spatio-temporal intersubstitution method, the mineralization characteristics of total organic carbon (TOC), organic carbon (MBC) and organic carbon (WSOC) were determined. The effects of reclamation and culture on TOC, organic carbon composition and mineralization in sediments were analyzed. The results showed that the contents of TOC and WSOC in sediments did not change significantly in 3 years, but the contents of TOC and WSOC in sediments increased significantly in 15 years of reclamation and 10 cm in surface layer. The increasing ratio of MBC was about 68.36% and 68.01 respectively, and the content of MBC decreased after reclamation and culture. After 15 years of reclamation, the EOC content of surface sediments decreased about 37.35%. The mineralization rate and cumulative mineralization rate of organic carbon in surface sediments after reclamation and culture were higher than those in short leaf wetland, but there was no significant difference in mineralization rate between subsurface layer (1020 cm) and subsurface layer (1020 cm). The accumulation of mineralization in the surface layer was higher than that in the subsurface layer. The TOC and organic carbon components in the sediments of the culture pond were affected by the long-term water flooding and feed addition, and indirectly by the physicochemical properties of clay, TN and TP. The above results indicate that the reclamation and cultivation of coastal wetlands can increase the accumulation of organic carbon in sediments and promote the mineralization of organic carbon to some extent.
【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】：国家基础科学人才培养基金(No.J1210067) 福建师范大学地理科学学院研究生科研创新基金~~
【分类号】：X171

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