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(一)云南松是我省当前主要用材和荒山造林的乡土树种。据考查,它的原始种出现在3000万年以前,50万年前就发展到我省南部,逐步成为我省的主要森林植被。据省资源调查管理处最近的森林资源清查材料载:全省128个县(市)中有107个县(市)有云南松分布,大多集中连片。总面积占全省有林地面积的64%,占总蓄积量的44.1%。我省的森工企业和木材收购部门,大都以经营云南松为主,每年向国家提供大量的建设用材和人民生活用材。而且云南松对气候土壤条件要求不严,具有耐旱、耐瘠薄和较速生的特点,其种子飞散力强,繁殖容易。
(A) Yunnan pine is the main timber and afforested native tree species in the province. According to the test, its original species appeared in 30 million years ago, 500,000 years ago developed into the southern province, and gradually become the main forest vegetation in our province. According to the recent inventory of forest resources of the Provincial Resources Survey Management Office, 107 counties (cities) in 128 counties (cities) in the province have Yunnan pine distribution, most of which are concentrated in contiguous. The total area accounts for 64% of the province’s forest area, accounting for 44.1% of the total volume. The forest industry enterprises and timber purchasing departments in our province mostly operate mainly Yunnan pine and provide a large amount of timber for construction and people’s daily use to the country. And Yunnan pine on the requirements of climate and soil conditions lax, with drought-resistant, barren and relatively fast-growing characteristics of its strong seed flying, easy reproduction.