School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Mar Pollut Bull. 2018 Apr;129(1):329-335. doi: 10.1016/j.marpolbul.2018.02.052. Epub 2018 Mar 23.
Spatiotemporal variations of dissolved nutrients were studied along Gautami-Godavari mangrove ecosystem to delineate their sources and fate. Average values of nitrate (NO), dissolved silica (DSi) and phosphate (PO) is 2.09 mg/l, 12.7 mg/l and 0.16 mg/l in wet season and 0.47 mg/l, 6.96 mg/l and 0.29 mg/l in dry season respectively. In wet season river discharge has significant influence on NO and DSi. In dry season, NO and PO are controlled by groundwater discharge, benthic exchange and various in situ processes owing to sediment redox condition. Mixing model shows net addition of phosphate in Coringa mangroves (95%) and Lower estuary (13%) and net removal of nitrate (24.79%) in Coringa mangrove and in estuary (58.9%). Thus present mangrove acts as net source for phosphate and net sink for nitrate and DSi. Nutrient ratio shows seasonal switching between potential Phosphorus and Nitrogen limitation in wet and dry season respectively.
沿高韦里-戈达瓦里红树林生态系统研究了溶解养分的时空变化，以阐明它们的来源和归宿。在雨季，硝酸盐（NO）、溶解硅（DSi）和磷酸盐（PO）的平均值分别为 2.09mg/L、12.7mg/L 和 0.16mg/L，而在旱季则分别为 0.47mg/L、6.96mg/L 和 0.29mg/L。在雨季，河川流量对 NO 和 DSi 有显著影响。在旱季，由于沉积物的氧化还原条件，地下水排放、底质交换和各种原地过程控制着 NO 和 PO 的含量。混合模型显示，科林加红树林（95%）和下游河口（13%）中磷酸盐的净添加，以及科林加红树林和河口（58.9%）中硝酸盐（24.79%）的净去除。因此，目前的红树林是磷酸盐的净源，也是硝酸盐和 DSi 的汇。养分比显示，在雨季和旱季，潜在的磷和氮限制之间分别发生季节性转换。
