Introduction to the Japanese black pine plantation: The Japanese black pine plantation is distributed on the south bank of Daxishan Reservoir, on the hillside under the jurisdiction of Liushugou Village, and on the north bank of Wangjiadian Reservoir, on the hillside under the jurisdiction of Tangligou Village. The dominant species in the understory shrub layer is Piper sibirica, mixed with Lespedeza tenuifolia and Adelphia niger.