Differences in the distribution of constant element content in surface sediments inside and outside Rongcheng Swan Lake and their influencing factors
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摘要:
于2020年9月和2023年9月利用蚌式取样器在天鹅湖和荣成湾44个站位进行表层沉积物采样，通过对样品的粒度和常量元素进行测试，分析了潟湖内外粒度和常量元素的平面分布特征及其差异，结合相关性分析、水动力数值模拟、聚类分析、主成分分析等方法，探讨研究区表层沉积物常量元素分布的主要控制因素。结果表明，天鹅湖表层沉积物组分以砂为主，荣成湾表层沉积物组分以粉砂为主，天鹅湖表层沉积物粒度明显粗于荣成湾；天鹅湖表层沉积物的SiO2和P2O5含量（75.74%和0.055%）高于荣成湾（61.73%和0.053%），Al2O3、TFe2O3、MgO等常量元素含量均低于荣成湾。整体上SiO2的分布与平均粒径的分布趋势相反，其他大部分常量元素分布与平均粒径的分布相似，大部分常量元素含量在荣成湾由岸边向外海逐渐增加，在天鹅湖其含量由湖岸向湖内逐渐增加。粒度是影响荣成湾和天鹅湖大部分常量元素（SiO2、Al2O3、TFe2O3、MgO等）分布的主要因素，且对荣成湾的影响明显高于天鹅湖；天鹅湖表层沉积物的K2O分布受成山头海岸侵蚀物质和粒度的共同影响，荣成湾的K2O分布主要受侵蚀物质的影响；天鹅湖表层沉积物的P2O5分布主要受人类活动和海草床的共同影响，而荣成湾的P2O5分布主要受粒度影响。
Abstract:In September 2020 and September 2023, surface sediment samples fromsediments were sampled at 44 stations inside and outside the using a clam sampler in Swan Lake inand Rongcheng Bay, Shandong Peninsula, East China, and the sample particle size and major elements were tested. Based on the test results, the plane distribution characteristics and differences of grain size and major elements inside and outside the lagoon were analyzed. Combined with correlation analysis, hydrodynamic numerical simulation, cluster analysis, principal component analysis and other methods, the main control factors of the distribution of major elements were explored. Results show that the sediment components of Swan Lake are mainly sand, and the sediment components of Rongcheng Bay are mainly silt. The grain size of Swan Lake sediment is obviously coarser than that of Rongcheng Bay. The average contents of SiO2 and P2O5 in the sediments of Swan Lake (75.74% and 0.055%) were higher than those in Rongcheng Bay (61.73% and 0.053%), and the contents of major elements such as Al2O3, TFe2O3 and MgO were lower than those in Rongcheng Bay.Overall, the distribution of SiO2 is opposite to the distribution trend of average particle size, and the distribution of most other major elements was similar to the distribution of average particle size. The contents of most major elements in Rongcheng Bay increased gradually from the shore to the open sea, and those in Swan Lake increased gradually from the shore to the lake. Particle size was the main factor affecting the distribution of most major elements (SiO2, Al2O3, TFe2O3, MgO, and so on) in the two lakes, and its impact on Rongcheng Bay was significantly higher than that on Swan Lake. The distribution of K2O in the sediments of Swan Lake was affected by the erosion materials and their grain size from Chengshantou coast, and that in Rongcheng Bay was mainly affected by erosion materials. The distribution of P2O5 in the sediments of Swan Lake was mainly affected by human activities and seagrass beds, while that in Rongcheng Bay was mainly affected by grain size.
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Key words:
- Rongcheng Bay /
- Swan Lake /
- surface sediments /
- geochemical characteristics /
- influencing factors
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表 1 潮流潮位验证点概况
Table 1. Overview of tide level verification points
潮流验
证点纬度(N) 经度(E) 潮位验
证点纬度(N) 经度(E) 1# 36°38.220′ 122°25.136′ 鸡鸣岛 37°25′ 122°28′ 2# 36°52.621′ 122°44.149′ 海驴岛 37°27′ 122°40′ 3# 36°49.661′ 122°57.818′ 成山头 37°23′ 122°42′ 4# 37°14.057′ 122°57.600′ 马他角 37°12′ 122°37′ 靖海角 36°54′ 122°26′ 2# 36°52.621′ 122°44.149′ 
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表 2 研究区表层沉积物常量元素含量
Table 2. The content of major elements in surface sediments of the study area
% 元素 荣成湾 天鹅湖 范围 平均值 范围 平均值 SiO2 47.48～75.02 61.73 61.47～91.36 75.74 Al2O3 7.00～16.43 12.44 4.58～14.13 9.01 TFe2O3 1.40～7.77 4.62 0.36～5.33 2.20 MgO 0.36～3.41 2.10 0.02～2.44 0.79 MnO 0.022～0.091 0.061 0.005～0.070 0.023 TiO2 0.114～0.395 0.281 0.032～0.661 0.238 CaO 1.39～4.86 3.61 0.33～5.29 1.30 Na2O 1.84～4.65 2.66 0.48～2.93 1.83 K2O 2.24～3.17 2.88 1.72～3.26 2.57 P2O5 0.024～0.066 0.053 0.008～0.237 0.055
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表 3 常量元素主成分分析结果
Table 3. Results of principal component analysis of constant elements
元素 荣成湾 元素 天鹅湖 F1 F2 F1 F2 F3 P2O5 0.97 0.12 TFe2O3 0.94 0.06 0.08 MgO 0.95 0.28 MgO 0.94 0.12 0.05 CaO 0.94 0.05 Al2O3 0.93 0.12 0.22 Al2O3 0.93 0.37 MnO 0.86 0.13 0.15 MnO 0.92 0.34 SiO2 −0.84 0.29 0.30 TFe2O3 0.91 0.39 Na2O 0.80 −0.32 −0.13 SiO2 −0.89 −0.41 TiO2 0.78 0.36 0.42 TiO2 0.88 −0.11 CaO 0.60 −0.56 −0.22 Na2O 0.66 0.22 K2O 0.54 0.71 −0.09 K2O 0.13 0.96 P2O5 0.45 0.02 0.83 方差贡献率/% 72.95 16.52 方差贡献率/% 35.81 27.02 22.03 累积贡献率/% 72.95 89.47 累积贡献率/% 35.81 62.83 84.86
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