Dhame Shreya, Kumar Alok, Ramanathan A L, Chaudhari Punarbasu
School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India; Department of Environmental Science, Central University of Rajasthan, Kishangarh, Ajmer, 305817, Rajasthan, India.
Mar Pollut Bull. 2016 Oct 15;111(1-2):68-85. doi: 10.1016/j.marpolbul.2016.07.027.
Spatial distribution and interrelationship among organic nutrients - silica and carbon - and various lithogenic elements were investigated in the surficial sediments of Matla estuary and Core Zone of Indian Sundarbans Reserve Forest using spatial analysis and multivariate statistics. Biogenic silica (BSi), an important parameter for coastal biogeochemisry, was measured using Si-time alkaline leaching method. BSi concentration ranged from 0.01% to 0.85% with higher concentrations in upstream region of Matla estuary and attenuated values towards the bay, seemingly due to changes in hydrodynamics and land use conditions. Spatial distribution of BSi did not exhibit significant correlation with sediment parameters of organic carbon (OC), elemental composition and clay content. However, it showed significant contrasting trends with total phosphorus (TP) and total silica of human influenced Matla estuary sediments as well as the dissolved silica (DSi) of its surface waters. Anthropogenic influence on sediment geochemistry is discernable with the presence of higher concentrations of organic and inorganic elements in Matla estuary than in Core Zone sediments. Spatial variation trends are often challenging to interpret due to multiple sources of input, varying energy and salinity conditions and constant physical, chemical and biological alterations occurring in the environment. Nonetheless, it is certain that anthropogenic activities have a substantial influence on biogeochemical processes of Sundarbans mangrove-estuarine complex and potentially the coastal ocean.
利用空间分析和多元统计方法，对印度孙德尔本斯保护区森林马特拉河口和核心区域表层沉积物中的有机养分（二氧化硅和碳）以及各种成岩元素的空间分布和相互关系进行了研究。生物源二氧化硅（BSi）是海岸生物地球化学的一个重要参数，采用硅计时碱性浸提法进行测定。BSi浓度范围为0.01%至0.85%，在马特拉河口上游区域浓度较高，向海湾方向逐渐降低，这似乎是由于水动力和土地利用条件的变化所致。BSi的空间分布与有机碳（OC）、元素组成和粘土含量等沉积物参数没有显著相关性。然而，它与受人类影响的马特拉河口沉积物中的总磷（TP）和总二氧化硅以及其地表水的溶解二氧化硅（DSi）呈现出明显的对比趋势。马特拉河口沉积物中有机和无机元素的浓度高于核心区域沉积物，这表明人为因素对沉积物地球化学有明显影响。由于输入源多样、能量和盐度条件变化以及环境中持续发生物理、化学和生物变化，空间变化趋势往往难以解释。尽管如此，可以确定的是，人为活动对孙德尔本斯红树林 - 河口复合体以及潜在的沿海海洋的生物地球化学过程有重大影响。
