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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal changes in nitrogen and phosphorus transport in the lower Changjiang River before the construction of the Three Gorges Dam
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Seasonal changes in nitrogen and phosphorus transport in the lower Changjiang River before the construction of the Three Gorges Dam

机译：三峡大坝建成前长江下游氮磷运移的季节变化

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Water and sediment samples were collected at Datong from June 1998 to March 1999 to examine seasonal changes in the transports of nitrogen (N) and phosphorus (P) from the Changjiang River (Yangtze River) to the East China Sea (ECS). Dissolved inorganic nitrogen (DIN; dominated by nitrate) concentration exhibited small seasonality, and DIN flux was largely controlled by water discharge. Dissolved inorganic phosphorus (DIP) concentration was inversely correlated with water discharge, and DIP was evenly delivered throughout a year. The transports of DIN and DIP from the Changjiang River were consistent with seasonal changes in nutrient distributions and P limitation in the Changjiang Estuary and the adjacent ECS. Dissolved organic and particulate N (DON and PN) and P (DOP and PP) varied parallel to water discharge, and were dominantly transported during a summer flood. The fluxes of DOP and particulate bioavailable P (PBAP) were 2.5 and 4 times that of DIP during this period, respectively. PBAP accounted for 12-16% of total particulate P (PP), and was positively correlated with the summation of adsorbed P, Al-P and Fe-P. Ca-P, the major fraction of PP, increased with increasing percent of CaCO_3. The remobilization of riverine DOP and PBAP likely accounted for the summer elevated primary production in DIP-depleted waters in the Changjiang Estuary and the adjacent ECS. The Changjiang River delivered approximately 6% of DIN (1459 × 10~6 kg), 1% of DIP (12 × 10~6 kg), and 2% of dissolved organic and particulate N and P to the totals of global rivers. The construction of the Three Gorges Dam might have substantially reduced the particulate nutrient loads, thereby augmenting P limitation in the Changjiang Estuary and ECS.
机译：1998年6月至1999年3月在大同市采集了水和沉积物样本，以调查从长江（长江）到东海（ECS）的氮（N）和磷（P）运输的季节性变化。溶解的无机氮（DIN；以硝酸盐为主）的浓度表现出较小的季节性，并且DIN的通量主要受排水控制。溶解的无机磷（DIP）浓度与排水量成反比，并且DIP全年均匀分布。长江中的DIN和DIP的运移与长江口及邻近ECS的养分分布和P限制的季节变化一致。溶解的有机物和颗粒物氮（DON和PN）和P（DOP和PP）的变化与排水量平行，并且在夏季洪水期间主要运输。在此期间，DOP的通量和颗粒生物利用度P（PBAP）的通量分别是DIP的2.5倍和4倍。 PBAP占总颗粒P（PP）的12-16％，与吸附的P，Al-P和Fe-P的总和呈正相关。 Ca-P是PP的主要成分，随CaCO_3百分比的增加而增加。沿河DOP和PBAP的迁移很可能是造成长江口和邻近ECS的DIP枯竭水域夏季初级生产增加的原因。长江向全球河流输送了大约6％的DIN（1459×10〜6 kg），1％的DIP（12×10〜6 kg）以及2％的溶解有机物和颗粒态氮和磷。三峡大坝的建设可能已大大减少了颗粒物的营养负荷，从而增加了长江口和ECS中的磷含量。

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