Sediment properties along gradients of siltation in south-east Asia
Sediment properties along gradients of siltation in south-east Asia
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东南亚沿淤积梯度的沉积物特性
DOI：
10.1006/ecss.2001.0822
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发表时间：
2002
影响因子：
2.8
通讯作者：
O. Geertz‐Hansen
中科院分区：
文献类型：
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作者：
L. Kamp;J. Vermaat;I. Wesseling;J. Borum;O. Geertz‐Hansen
沿沿着东南亚淤积梯度和不同生境类型对海洋沉积物特性进行了量化，以评估陆地沉积物影响的程度，并得出陆地沉积物输入的指标。研究了安达曼海的三个地点（拉农、普吉岛和董里;泰国）、泰国湾的一个地点（帕帕南;泰国）和中国南海的三个地点（吕宋岛的Bolinao、民都洛岛的加莱拉港和巴拉望岛的埃尔尼多，均在菲律宾）。涵盖了以下主要生境类型：红树林、海草床、珊瑚礁、泥滩、河口和深水道。特别是在Bolinao和埃尔尼多，在距离源头约7公里处发现了明显的淤积前缘。泥浆（250米）、总碳和无机碳以及钙。填隙氨和磷酸盐随细砂含量沿着第二轴变化。双因素方差分析表明，水深、距沙源距离、立地和生境类型对变异均有贡献，但立地的解释作用最大。线性回归分析表明，粉粒与土壤含水量、有机质、全氮、全磷、铁呈显著正相关，与钙呈显著负相关，表明铁和钙分别是陆源和陆源的标志物。沉积物颗粒物组成将生境类型分为两类：（1）河口、浅泥底、深水道和红树林等粉砂质生境，有机质和营养盐含量较高;（2）海草床和珊瑚礁等非粉砂质生境，营养盐和有机质含量较低。泥沙负荷的中值沉降速度从0·6米D-1到27米D-1不等。实验确定的再悬浮敏感性确定了50%的临界含水量。2002 Elsevier Science Ltd.
Marine sediment properties were quantified along SE Asian siltation gradients and across different habitat types to assess the extent of terrestrial sediment influence and derive indicators of of terrestrial sediment input. Three sites in the Andaman Sea (Ranong, Phuket and Trang; Thailand), one site in the Gulf of Thailand (Pak Phanang; Thailand) and three sites in the South China Sea (Bolinao at the Luzon Island, Puerto Galera at the Mindoro Island and El Nido at the Palawan Island, all in the Philippines) were studied. The following main habitat types were covered: mangroves, seagrass beds, coral reefs, mud flats, river mouths and deep channels. Particularly in Bolinao and El Nido, distinct fronts in siltation were identified at about 7 km from the source. Mud ( 250 m), total and inorganic carbon as well as calcium. Interstitial ammonia and phosphate varied with the fine sand fraction along the second axis. Two-way analysis of variance showed that water depth, distance from silt source, site and habitat type all contributed to the variance, but site explained most. Linear regressions showed positive correlations between silt and water content, organic matter, total nitrogen, total phosphorus and iron, but negative correlations with calcium suggesting iron and calcium as markers for terrigeneous and marine origin, respectively. The composition of the sediment particulate matter groups the habitat types in two clusters: (1) silty types as river mouths, shallow mud bottoms, deep channels and mangrove stands with high contents of organic matter and nutrients versus (2) non-silty types as seagrass beds and coral reefs with low contents of nutrients and organic matter. Median settling velocities of the silt loads varied from 0·6 m d 1 to 27 m d 1 . Experimentally determined susceptibility to resuspension identified a critical water content of 50%. 2002 Elsevier Science Ltd.