论文部分内容阅读
加拿大林业资源占用的劳动力占全国劳动力总额的11％左右,林产工业的年产值约60亿元,其中出口额约37亿元,占全国出口总额的19％。全国森林害虫约一百种,害虫和其他有害生物每年毁损1400多万立方米木材,亦即10万余公顷成熟林的蓄积量。近年来东部地区受云杉卷叶蛾为害的森林面积达5260万公顷,对工业生产、劳动就业、森林的美学和游憩价值、野生动物栖所和水源造成相当大的影响,而且增加了森林火灾的危险。在这种情况下不得不大面积喷布化学杀虫剂,同时加强对生物杀虫剂、昆虫生长调节剂、性引诱剂和遗传防
Canada’s forestry resources occupy about 11% of the total labor force in the country. The annual output value of forestry industry is about 6 billion yuan, of which about 3.7 billion yuan is exported, accounting for 19% of the total. About 100 forest pests throughout the country, pests and other pests devastate more than 14 million cubic meters of timber per year, or 100,000 hectares of mature forest. In recent years, 52.6 million hectares of forest in the eastern region have been damaged by spruce-leaf moths and have had a considerable impact on industrial production, employment, forest aesthetics and recreational values, wildlife habitats and water sources and increased the risk of forest fires . In this case, chemical pesticides have to be sprayed over a large area, while strengthening the biological pesticides, insect growth regulators, sex attractants and genetic protection