Changing urban phosphorus metabolism: Evidence from Longyan City, China

Phosphorus flow of Longyan in 1985(a) and 2010(b) (Unit: t P). Arrows are sized relative to the magnitude of the flow; red arrows are P input flows; blue arrows are P output flows; orange arrows are P flows internal to the system; green arrows are P recycling flows internal to the system. The percentages are used to express the ratio of the input, output or stock categories to the total P input.170