怎样经营林木,才能在有限的土地上生产更多的林产品和副产品呢? 传统的林业经营方式,是营造“同龄纯林”(就是树龄、树种都一样的林木)。是单层次地利用土地和空间,不仅不经济,而且容易感染病虫害。为了充分利用土壤和光能,计林地生产更多的产品,发挥更大的经济效益.目前国内外有些部门正在进行“立体林业”的研究。 How can we manage forest trees to produce more forest products and by-products on limited land? The traditional way of managing forestry is to create a “pure forest of the same age” (that is, trees of the same age and species). It is not only uneconomical but also susceptible to pests and diseases by using land and space at a single level. In order to make full use of soil and light energy, it is more economical to produce more products in forestland, and some departments at home and abroad are carrying out the research of “three-dimensional forestry”.