Long-term and longitudinal nutrient stoichiometry changes in oligotrophic cascade reservoirs with trout cage aquaculture
Long-term and longitudinal nutrient stoichiometry changes in oligotrophic cascade reservoirs with trout cage aquaculture
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鳟鱼网箱养殖贫营养级联水库的长期和纵向营养化学计量变化
DOI：
10.1038/s41598-020-68866-7
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发表时间：
2020-08
影响因子：
4.6
通讯作者：
Wang Zhenji
中科院分区：
文献类型：
--
作者：
Miao Shiyu;Jian Shenglong;Liu Yang;Li Changzhong;Guan Hongtao;Li Kemao;Wang Guojie;Wang Zhenji
在贫营养沃茨，鳟鱼网箱养殖引起的潜在营养盐化学计量变化备受关注。2013 - 2017年，研究了黄河上游贫营养区6座虹鳟鱼网箱养殖梯级水库水体中总氮、总磷及氮磷比的长期变化。5年的监测结果表明，在高海拔贫营养沃茨水域，N、P及N：P比值水平均未出现明显的长期变化。从龙羊峡水库上游到积石峡水库下游的6座梯级水库中，N、P和N/P比值水平在纵向上没有明显变化。网箱养殖增加的N和P分别仅占自然N和P水平的1.74%和5.2%，鱼产量为10，000吨。黄河上游仍然是贫营养和磷限制。本研究的结果证明，即使在贫营养的沃茨中，鳟鱼网箱养殖也不一定会引起氮、磷和N：P比值的变化。在高N：P比值的沃茨中确定优先氮磷源及相应的控制措施时，应首先考虑磷。
The potential nutrient stoichiometry changes caused by trout cage aquaculture is concerned especially in oligotrophic waters. Long-term total nitrogen (N), total phosphorus (P) and N:P ratio changes in 6 cascade reservoirs with rainbow trout cage aquaculture in the oligotrophic upstream Yellow River (UYR) were studied from 2013 to 2017 in this paper. The 5-year monitoring results showed that N, P and N:P ratio levels showed no obvious long-term changes in high-altitude oligotrophic waters with rainbow trout cage aquaculture. No obvious longitudinal N, P and N:P ratio level changes were observed in the 6 cascade reservoirs from upstream Longyangxia Reservoir (LYR) to downstream Jishixia Reservoir (JSR). The increased N and P resulting from the cage aquaculture accounted only for 1.74% and 5.2% of the natural N and P levels, respectively, with a fish production of 10,000 tonnes. The upstream Yellow River remained oligotrophic and phosphorus-limited. Results in this study proved that trout cage aquaculture do not necessarily cause nitrogen, phosphorus and N:P ratio changes even in oligotrophic waters. Phosphorus should be considered first when identifying priority nitrogen and phosphorus sources and the corresponding control measures in waters with high N:P ratio.
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