????:1?????????:?????????

2???????

3???????

4?????????

5???????????

???????????????10?????8???????????? ?????????8?????????????,?,?58%,??,??????????

????????????????,???«Wetlands»????????????????,???1????????????3?????????????:1920?????1950?????????????????,?????????;?????????????????????1950???????????????,??????????????????;???2010???????????,?????????????58%??

?,??,????????,????????????????????;?????????????,?????,??????,?????????????

????????????????,???????,?,??????????,??????

?????,????????????????,?????????????1984??2016??????????16%?20?????????????????????,??????????,???????????????,??????

??????????,??,????????(??????????????????) ???????????????????????????:?????