论文部分内容阅读
近十几年,森林生物量的生产和利用已引起许多国家的重视,也提出了一些区别于传统粗放经营和单一木材利用的新概念和新体制。有些新体制已通过试验阶段逐步在生产中实施。例如,全树收获、短轮伐期集约栽培、超短轮伐期、能源林、农业林及杨树的农业栽培等。这些新体制的共同特点是集约程度高,投入多,产出多,生产周期短和对生物量进行多种利用。欧美各国的研究表明,杨树叶的营养成分与苜蓿相似,可以直接作饲料;或以杨树叶和其它多汁液的组织为原料生产杨叶粉,浓缩蛋白质,甚至其它化学药品。
In recent ten years, the production and utilization of forest biomass has drawn the attention of many countries and also proposed some new concepts and systems that are different from the traditional extensive management and single-use of timber. Some new systems have been gradually implemented in production through the pilot phase. For example, full tree harvesting, short rotation intensive cultivation, ultra-short rotation, energy forest, agriculture and poplar cultivation. Common features of these new systems are high levels of concentration, more inputs, more output, shorter production cycles and multiple uses of biomass. Studies in Europe and the United States have shown that poplar leaves have similar nutrients to alfalfa and can be used as feed; or poplar leaves, protein concentrates or even other chemicals can be produced from poplar leaves and other juicy liquid tissue.