防城港湾红树林表层沉积物粒度分形特征及与环境因子的相关性  

Fractal characteristics and correlation with environmental factor on the surface sediments in mangrove areas of Fangchenggang Bay

作　　者：梁文[1,2,3] 李智[1,2,3] 范航清[1,2,3] 谭趣孜[1,2,3] 黎广钊 农华琼[1,2,3] 

机构地区：[1]广西科学院广西红树林研究中心,广西北海536000 [2]广西海洋环境与滨海湿地研究中心,广西北海536000 [3]广西红树林保护与利用重点实验室,广西北海536000

出　　处：《应用海洋学学报》2013年第2期184-192,共9页Journal of Applied Oceanography

基　　金：广西科学基金资助项目(桂科基0575025);广西自然科学基金重大资助项目(2012GXNSFEA053001)

摘　　要：应用分形理论分析了防城港湾红树林表层沉积物粒径分布及其分形特征,并分析了pH值、C有机质、C硫化物、CTN、CTP、CK、水溶性盐分等环境因子.沉积物由海向陆的砂含量减少,细砾、粉砂和粘土含量增多,平均粒径也呈渐次增大.沉积物分选性都是差到很差,偏态都是正偏态到很正偏态,峰态都是中等尖锐到很尖锐.沉积物各粒径含量与pH值、有机质、硫化物含量相关关系不明显,砂、粉砂含量与CTN、CTP、CK呈显著相关关系.沉积物的分形维数为2.322 1～2.649 1,分维值与环境因子相关关系不明显,与粘土含量呈显著正相关(R=0.978,p<0.01).沉积物分形值呈含砾砂(2.322 1)<含砾泥质砂(2.513 0～2.618 1)<含砾泥(2.649 1)的趋势.不同滩位的红树林沉积物分形维数呈现向海侧红树林外光滩(2.322 1～2.560 2)<向海侧红树林林带(2.513 0～2.590 9)<红树林林带中心(2.557 0～2.595 6)<向陆侧红树林带(2.618 1～2.649 1)的规律.沉积物类型、粘土组分、滩位等是影响防城港湾红树林沉积物分形维数的主要环境因子.The particle size distribution, fractal characters of sediments and environmental factor such as pH value, organic matter, sulfide, total nitrogen, total phosphorus, total potassium and soluble salt in mangrove areas of Fangchenggang Bay were investigated with the help of fractal theory. The results shows that from the sea to the land, ,sand content of the sediment decreased while the fine gravel, silt and clay content increased with gradual increment of average particle size. Besides, the sorting of the sediment became worse, skewness became more positive and kurtosis became much sharper. There was a weak correlation between various particle size content of the surface sediments and pH value, organic matter and sulfide content, while there was a strong correlation between the sand and silt content and total nitrogen, total phosphorus, total potassium. The fraetal dimension of the sediment ranged from 2. 322 1 to 2. 649 1, which had little significant correlation with the environmental factors except for clay content（R = 0. 978 ,p 〈 0.01 ）. The fractal dimension of mangrove surface sediments became larger from sand containing gravel to muddy sand containing gravel, to mud containing gravel. It also became larger from the tidal flat （2. 322 1 ~ 2. 560 2 ）to the seaward mangrove forest belt （2.513 0 -2. 590 9 ）to the center of the mangrove forest belt（2. 557 0 -2. 595 6）to the landward mangrove forest beh（2. 618 1 -2. 649 1 ）. Sediment types, clay content and beach location were main factors that influencing the fractal dimension of surface sediments in mangrove areas of Fangchenggang Bay.

关 键 词：海洋地质学 红树林 沉积物 粒径分布 分形维数 

分 类 号：P736[天文地球—海洋地质]