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 Production162.00million t DW
Seaweed Area161,250km2
N concentration*3.76 ± 0.92% DW
P concentration*0.47 ± 0.19% DW
N removal75,371 ± 18,423t N year−1
P removal9,496 ± 3,875t P year−1
Per km2 of Seaweed Farm and Year
Seaweed Production1,604t DW
N concentration*3.76 ± 0.92% DW
P concentration*0.47 ± 0.19% DW
N removal60.31t N km−2 year−1
P removal7.60t P km−2 year−1
N input**3.38t N km−2 year−1
P input**0.06t P km−2 year−1
Seaweed Farm N Footprint area17.8km2 of coastal ocean removed of N inputs km−2 of seaweed farm
Seaweed Farm P Footprint area126.7km2 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.