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云南松为云南的主要用材树种。森林面积占全省森林总面积的64％,蓄积量占全省森林总蓄积量的44％,其中有2.41亿立方米为用材林,有0.33亿立方米为防护林。因此云南松林在云南森林中占有举足轻重的地位。但是云南松林在森林生态效益方面表现较差。为了充分发挥云南松林的有利特性和提高其生态效益,就必须把云南松纯林改造为针阔叶混交林。本文所提的改造云南松纯林并非是违背客观规律,不是把分布广,适应性强的云南松淘汰和取代,而是因地制宜地改变林分结构和组成,取其之长,避其之
Yunnan pine is the main timber species in Yunnan. The forest area accounts for 64% of the total forest area in the province, accounting for 44% of the total forest volume in the province, of which 241 million cubic meters are timber forests and 33 million cubic meters are shelterbelts. Therefore, Yunnan pine forest in Yunnan forest occupies a pivotal position. However, Yunnan pine forests perform poorly in terms of forest ecological benefits. In order to give full play to the favorable characteristics of Yunnan pine and improve its ecological benefits, it is necessary to transform the pure Pinus yunnanensis into coniferous and broad-leaved mixed forest. The transformation of pure Pinus yunnanensis mentioned in this article is not against the objective law, not to eliminate and replace the widely distributed and adaptable Yunnan pine, but to change the structure and composition of stands according to the local conditions,