桑沟湾立体生态方建设对碳通量及来源的影响分析

Influence Analysis of Carbon Flux and Source of Vertical Ecological Construction of Songgou Bay

摘要: 本文对采自桑沟湾内不同养殖区的21个沉积物样品进行研究，测定了它们的总碳(TC)、有机碳(TOC)、总氮(TN)含量，并对碳氮比值(C/N)进行了分析，结果表明在贝藻混养区及藻类养殖区西侧TC的含量较高，超过1.2%；对照区以及藻类养殖区东侧TC含量略低；贝类养殖区TC含量最低(<1%)。TN含量较高的站位出现在贝藻混养区及藻类养殖区西侧(0.03%)，而在贝类养殖区、鱼类养殖区TN含量较低。TOC含量较高的站位同样出现在贝藻混养区及藻类养殖区西侧(0.37%)。在东部对照区C/N值较高(12.45)，其次是贝类养殖区和藻类养殖区，鱼类养殖区C/N值相对最低。立体生态方建设前，桑沟湾养殖区沉积物有机碳形态较为单一，建设后桑沟湾内有机碳为海陆混合来源。湾外以海源碳为主，湾内海源碳含量立体生态方建设后较建设前明显升高。

Abstract: In this paper, we research 21 sediment samples from different culture areas of Songgou Bay, test their total carbon (TC), total organic carbon (TOC), total nitrogen (TN), and analyze car-bon-to-nitrogen ratio, etc. The results show that TC content is higher (more than 1.2%) at west of algae culture area and scallop/algae mix culture area, slightly lower at control area and east of al-gae culture area, and lowest at scallop culture area. Sample stations with higher TN content (0.03%) also locate at west of algae culture area and scallop/algae mix culture area; TN content is lower at scallop and fish culture area. Sample stations with higher TOC content (0.37%) also locate at west of algae culture area and scallop/algae mix culture area. Carbon-to-nitrogen ratio is higher (12.45) at east control area, the next is scallop and algae culture area, and the ratio at fish culture area is relatively lowest. Form of sediment organic carbon was relatively single before vertical ecological construction. Organic carbon of Songgou Bay comes from mixed source of sea and land after construction, organic carbon outside the bay is mainly from marine source, and organic carbon from marine source inside the bay is obviously higher compared with that before construction.