营林: 六十年代世界造林面积逐年扩大,人工速生丰产林比重不断增加。为促进林木生长,一些国家建立了种子园,培育良种壮苗,同时采用改良土壤、林地施肥和間伐作业等措施。每公頃林木年平均生长量有的国家高达四立方米。目前,許多国家对提高林木生长量都比較重視。 Forest Management: The world’s afforestation area in the 1960s has been expanding year by year, and the proportion of artificial fast-growing and high-yield forests has been steadily increasing. In order to promote the growth of trees, some countries have established seed orchards to cultivate seedlings of improved seed quality while adopting such measures as improving soil, woodland fertilization and thinning operations. The average annual growth of trees per hectare in some countries up to four cubic meters. At present, many countries attach more importance to improving their tree growth.