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Tianjin Qilihai wetland is an important wetland nature reserve in north China, which has important ecological value. Over the last few decades, the Qilihai wetland has been developed by human on a large scale, and the natural ecosystem has been seriously disturbed by human activities. In this study, principal component analysis was conducted on 7 indicators that may have potential impacts on the Qilihai wetland from 2013 to 2017 to assess the threat of human activities to the wetland area. The results show that from 2013 to 2017, the impact of human activities on the Qilihai wetland is increasing year by year, among which the industrial development, transportation and the increase of human activities around the wetland may be the main threat for the wetland.

Threat assessment of Tianjin Qilihai wetland from human activities based on principal component analysis