本文關鍵詞： 有機碳組分 有機碳礦化 圍墾養(yǎng)殖 閩江口　出處：《環(huán)境科學學報》2017年11期 　論文類型：期刊論文

【摘要】：研究濱海濕地圍墾養(yǎng)殖后沉積物有機碳庫的動態(tài)變化,對科學評估沿海灘涂濕地開發(fā)利用對碳庫的影響具有重要意義.以閩江口鱔魚灘濕地為研究區(qū),采集不同圍墾年限(3 a和15 a)養(yǎng)殖塘和短葉茳芏(Cyperus malaccensis)(養(yǎng)殖塘圍墾前主要土著植被)濕地沉積物,測定其總有機碳(TOC)、有機碳組分(微生物生物量碳(MBC)、易氧化有機碳(EOC)、水溶性有機碳(WSOC))及有機碳礦化特征,并基于時空互代法,分析了圍墾養(yǎng)殖對沉積物TOC、有機碳組分及礦化的影響.結果表明:圍墾養(yǎng)殖3 a,沉積物TOC和WSOC含量總體上沒有顯著變化,但圍墾15a,表層(0~10 cm)沉積物TOC和WSOC含量顯著增加,其增加比例分別約為68.36%和68.01%;圍墾養(yǎng)殖后,沉積物MBC沒有顯著變化,EOC含量則有所降低,圍墾15 a后表層沉積物EOC含量約降低37.35%.圍墾養(yǎng)殖后表層沉積物有機碳礦化速率和累積礦化量均高于短葉茳芏濕地,而亞表層(10~20 cm)沉積物礦化速率差異不顯著,且表層累積礦化量高于亞表層.養(yǎng)殖塘沉積物TOC及有機碳組分受長期水淹和餌料添加等管理方式的影響,同時受黏粒、TN和TP等理化性質的間接影響,進一步影響沉積物礦化速率、累積礦化量和潛在礦化量(C0).上述結果預示著濱海濕地圍墾養(yǎng)殖在一定程度上增加了沉積物有機碳的蓄積,同時也促進了有機碳礦化.
[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.
【作者單位】： 福建師范大學地理科學學院;福建師范大學亞熱帶濕地研究中心;濕潤亞熱帶生態(tài)-地理過程教育部重點實驗室;
【基金】：國家基礎科學人才培養(yǎng)基金(No.J1210067) 福建師范大學地理科學學院研究生科研創(chuàng)新基金~~
【分類號】：X171

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