Source(源)FIow(流)> -_Source Sink(汇) Input flow 10 t/yr Output flow 10 t/yr Pool(库) stock,storage. compartment (库存)200t 1 1 Recycling flow(循环)20tyr Turnover rate=Input Flow/Stock Amount=10/200 周转率 =Output flow Stock Amount=10/200=1/20=5%/yr 1 turn over time=1/20(yr) Cycling rate recycling flow Stock amount =20/200=10% 流通率7 Pool (库）, stock, storage, compartment （库存）200 t Source（源） Flow（流） Sink（汇） Recycling flow（循环） 20 t/yr Input flow 10 t/yr Output flow 10 t/yr Turnover rate=Input Flow / Stock Amount=10/200 =Output flow / Stock Amount=10/200=1/20= 5% /yr = 1 / turn over time=1/ 20 (yr) Cycling rate = recycling flow / Stock amount =20/200= 10% 周转率 流通率