Some area has introduced European and American black poplar for papermaking since the 1970 s. These European and American black poplars adapt to the local climate, grow fast and expand their planting area rapidly. However, in recent years, the local eco-environmental problems are becoming more and more serious. 
some people think that the ecological environment of the region can be repaired by cutting off these European and American black poplars.
It is assumed that there are other crops that can replace the economic value of European and American black poplar