Thereinto, many human activities result in wetland decrease directly or indirectly, such as developing land unreasonably, water pollution, air pollution, reclamation of land from the lake and sea.

• 其中，人类不合理使用土地，水污染、空气污染，围湖、围海造田等经济活动都直接或间接地导致了湿地面积的逐年减少。