The Beipanjiang First Bridge is situated above a river and gorge of depth 575m in Beipanjiang in the border of Yunnan an......

调查了思南县乌江河谷地带的生态现状，探索和研究了生态恶化的原因及其规律，总结出了合理有效的生态恢复模式：主要通过植树造林、封山......