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

2?????????????

3?????200????????

4?????

5??????????

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

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

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

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

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

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