Table 1 Total nutrient removal by seaweed aquaculture in China and the nutrient removal capacity of Chinese seaweed farms km−2.

From: Nutrient removal from Chinese coastal waters by large-scale seaweed aquaculture

Total for China (2014)

Seaweed Production16

2.00

million t DW

Seaweed Area16

1,250

km2

N concentration*

3.76 ± 0.92

% DW

P concentration*

0.47 ± 0.19

% DW

N removal

75,371 ± 18,423

t N year−1

P removal

9,496 ± 3,875

t P year−1

Per km2of Seaweed Farm and Year

Seaweed Production

1,604

t DW

N concentration*

3.76 ± 0.92

% DW

P concentration*

0.47 ± 0.19

% DW

N removal

60.31

t N km−2 year−1

P removal

7.60

t P km−2 year−1

N input**

3.38

t N km−2 year−1

P input**

0.06

t P km−2 year−1

Seaweed Farm N Footprint area

17.8

km2 of coastal ocean removed of N inputs km−2 of seaweed farm

Seaweed Farm P Footprint area

126.7

km2 of coastal ocean removed of P inputs km−2 of seaweed farm

  1. The seaweed farm N and P footprint area refers to the km2 of Chinese coastal waters receiving nutrient inputs equivalent to those removed by one km2 of seaweed farms. *The average tissue nutrient concentrations of Chinese seaweed, as weighted per species (Tables S2–3); **Nutrient input from the inventory integrating the riverine and atmosphere resources, weighted by area of East China Sea and Yellow Sea10,31.
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