Countries recognize that it is necessary to conduct more extensive research on the long-term (over several rotations) sustainability of planted forests not only from an economic point of view but also from social and environmental perspectives.
各国认识到，必须不仅从经济角度、而且也从社会和环境角度来对人造林的长期（经数期轮植之后的）可持续性做更为广泛的研究。