Spatial distribution patterns of nitrogen and phosphorus in water and bed sediment of the Three Gorges Reservior
Spatial distribution patterns of nitrogen and phosphorus in water and bed sediment of the Three Gorges Reservior
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三峡水库水体和底泥中氮磷空间分布格局
DOI：
10.1016/j.jclepro.2021.129026
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发表时间：
2021
影响因子：
11.1
通讯作者：
Yang Wenjun
中科院分区：
文献类型：
--
作者：
Wang Danyang;Tang Xianqiang;Li Rui;Yang Wenjun
三峡库区的营养盐状况一直备受关注。然而，与支流相比，水库干流受到的关注相对较少。2015-2017年，我们在丰水期和枯水期分别对干流和10条支流的40个断面进行了采样，以揭示水体和沉积物中总氮(TN)和总磷(TP)的横向、垂直和纵向分布规律。水体中总氮和总磷的浓度分别为1.48~2.33 mg/L和0.09~0.16 mg/L。横向上，养分混合均匀，分布均匀。在垂直方向上，表层水的营养盐浓度高于底层水。在纵向上，由于河岸带和支流输入的氮的积累，TN浓度从库尾到库头增加，而TP浓度由于泥沙淤积而从尾部到库头降低。河床沉积物中总氮和总磷含量分别为622-949和916-950 mg/kg。它们都没有显著的纵向趋势，也没有与水体营养盐浓度的相关性。这项工作将有助于了解三峡库区营养盐动态。
Nutrient state in the Three Gorges Reservoir has long been concerned. Mainstream of the reservoir however has received relatively less researchers’ attention compared to tributaries. In 2015–2017, we sampled 40 cross-sections along mainstream and 10 tributaries in flood and dry seasons in order to reveal lateral, vertical, and longitudinal distribution patterns of total nitrogen (TN) and phosphorus (TP) in water and sediment. Concentrations of waterborne TN and TP ranged from 1.48 to 2.33 mg/L and 0.09 to 0.16 mg/L respectively. Laterally, nutrients were well mixed and homogeneously distributed. Vertically, nutrients concentrations in surface water were higher than in bottom water. Longitudinally, TN concentration increased from tail to head of the reservoir due to accumulation of nitrogen imported from riparian zone and tributaries, whereas TP concentration decreased from tail to head because of sediment deposition. TN and TP concentrations in channel bed sediment were 622–949 and 916–950 mg/kg respectively. Neither of them had significant longitudinal trends nor correlations with waterborne nutrient concentrations. This work will help to understand nutrient dynamics in the Three Gorges Reservoir.