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2008年1月、5月、8月和11月,对广西壮族自治区合浦县海湾3个红树林区进行调查,并采集水样,研究各区海水中不同形态氮的含量分布、形态特征、相互关系和氮磷比及其对生态环境的影响效应。结果表明,广西壮族自治区合浦县海湾红树林区海水中各形态氮主要以陆源的补充为主,以凋落物的释放补充为辅;其中,总氮、颗粒态氮、溶解态氮和溶解无机氮含量都具有春季、夏季偏高和秋季、冬季偏低的特征,只有溶解有机氮含量具有夏季最高、秋季和冬季次之、春季明显偏低的特征;研究区海水中氮的存在形态主要以溶解态氮为主,其占总氮的81.74%,但在溶解态氮中,溶解有机氮仅以55.06%略占优势;研究区海水中各形态氮含量之间多有显著正相关关系,但四季都能保持高度一致迁移、转化规律的只有总氮与溶解态氮、溶解无机氮和溶解态氮与溶解无机氮,溶解态氮和溶解无机氮无疑成为总氮的主导控制因子。研究区海水中各形态氮含量明显受到环境因子的影响,其中受悬浮物和总有机碳含量的影响较大,受透明度、总碱度、水温和叶绿素a含量的影响次之,受盐度和p H的影响相对较小;研究区海水中各形态氮含量对基础生物量(初级生产力、浮游植物总细胞数和浮游动物总个体数)和浮游生物结构(总种数、丰度、均匀度、多样性指数和多样性阀值)的影响明显,前者以正面影响为主,后者以负面影响为主,春季的影响程度尤为突出;除颗粒态氮与颗粒态磷含量的比值以12.23的明显低值显示氮的相对缺乏外,海湾红树林区海水中的其余4种形态氮含量的比值都在33.07~91.75之间,呈富足状态,尤以溶解无机氮最为显著,这与氮的来源途径较多、转化速率较高有关。
In January, May, August and November 2008, three mangrove areas in the cove of Hepu County, Guangxi Zhuang Autonomous Region were surveyed, and water samples were collected to study the content distribution, morphological characteristics and correlations of different forms of nitrogen in the seawater in different districts And nitrogen and phosphorus ratio and its impact on the ecological environment. The results showed that all forms of nitrogen in seawater of Mangrove Bay in Hepu County, Guangxi Zhuang Autonomous Region were mainly supplemented by terrestrial sources supplemented by the release of litter, of which total nitrogen, particulate nitrogen, dissolved nitrogen and dissolved inorganic nitrogen The content of dissolved organic nitrogen in the study area is characterized by the highest in summer, the second in autumn and winter, and the lowest in spring. The existing forms of nitrogen in the study area are mainly dissolved While nitrogen accounted for 81.74% of the total nitrogen. However, in the dissolved nitrogen, dissolved organic nitrogen was only slightly dominated by 55.06%. There was a significant positive correlation between the contents of various forms of nitrogen in the study area, but the four seasons Can maintain a high degree of consistent migration. Only the total nitrogen and dissolved nitrogen, the dissolved inorganic nitrogen, the dissolved nitrogen and the dissolved inorganic nitrogen, the dissolved nitrogen and the dissolved inorganic nitrogen are undoubtedly the dominant control factors of the total nitrogen. The contents of nitrogen in seawater were significantly affected by environmental factors, which were influenced by suspended matter and total organic carbon content, followed by transparency, total alkalinity, water temperature and chlorophyll a content, p H was relatively small. The effects of different forms of nitrogen in the study area on the basic biomass (primary productivity, total phytoplankton and total number of zooplankton) and plankton structure (total number, abundance, evenness , Diversity index and diversity threshold). The former is dominated by the positive effects, while the latter is dominated by the negative ones. The influence of the spring season is particularly prominent. Except for the ratios of particulate nitrogen to particulate phosphorus, 12.23 Significantly low values show the relative lack of nitrogen, Bay Mangrove waters of the remaining four kinds of forms of nitrogen content ratio between 33.07 ~ 91.75, was rich, especially dissolved inorganic nitrogen most significant, and nitrogen sources More ways, higher conversion rates.