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1983年9月,联邦德国聪德尔教授应北京林学院之邀来华讲学并进行实地考察。教授说:现今联邦德国森林永续利用的原则包含着森林生产的永续性和木材利用(采伐)
In September 1983, Professor German Zelder of the Federal Republic of Germany invited Beijing Forestry College to come to China to give lectures and conduct site visits. Professor said: Today the principle of sustainable use of forests in the Federal Republic of Germany contains the sustainability of forest production and timber utilization (harvesting)