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

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

3??????

4???????

5???98?????

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

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

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

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

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