森林是重要的可更新资源之一,除了传统的利用木材外,还要根据森林化学的,药用的和食用的潜在功能来评价森林,这个潜力的大小取决于干、鲜重的生物量和森林生物量的生产率。在缅因州已经建立生物量结合材积的调查试验地。从实际抽取包括小树和灌木在内的生物量调查比单独搞蓄积调查费用大约增加5％。 Forests are one of the key renewable resources. In addition to the traditional use of timber, forests are evaluated on the basis of their potential functions as chemical, medicinal and edible forests. The magnitude of this potential depends on dry and fresh biomass and Forest biomass productivity. In Maine we have established a pilot site for biomass-bound products. Biomass surveys, including actual tree and shrub surveys, increased by about 5% from the cost of conducting a stock survey alone.