Construction of nutrient profiles along the mainstream of Changjiang for nutrients, which covers 70% of water course from Qinghai-Tibetan Plateau to the river mouth. (IMAGE)

Science China Press

Construction of nutrient profiles along the mainstream of Changjiang for nutrients, which covers 70% of water course from Qinghai-Tibetan Plateau to the river mouth.

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Low concentrations were found in the Qinghai-Tibetan Plateau, and then nutrients increase in the river at 3500 km-3000 km upstream the river mouth and further downwards to the river mouth. Vertical arrows show the confluence of major tributaries, and horizontal arrow indicates the location of the Three Gorges Reservoir.

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