Aerial photo taken on Jan. 4, 2019 shows the wetland of dawn redwood in Dianwei Village in Panlong District of Kunming, capital of southwest China's Yunnan Province. The wetland is located at Songhuaba water source reserve, also the upper reaches of the Dian Lake. Songhuaba water source reserve is the main drinking water source of Kunming City. Ecological remediation measures have been implemented for ten years in this area to protect the environment. (Xinhua/Qin Qing)