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我国幅员辽阔,地形地势千差万别,植物群落分布回异。既有位于北回归线以内的热带、亚热带森林,也有位于纬度较高的寒带针叶树林。云、贵、川各省森林多分布在海拔二千米以上的高山地区,且90%林地坡度在25度以上;中南、华东地区的原始森林多处于边远山区,山势陡峭,河谷狭窄,地势十分复杂。形成了我国木材采运工作特有的复杂性。建国初期,我国南方各省在边远林区采用了滑道、木轨道、平车道、手推车道等各种地面集运材方式,虽然代替了人抬肩扛的落后方式,但劳动强度仍然很大,集运材仍然存在着线路长、转运环节多、生产效率低、木材损失与水土流失严重等问题,影响了森林的更新。为了促进采运技术的发展,五十年代末期各省林区相继出现了各种集、运材架空索道。既有把山高坡陡的不利因素变为有利条
Our country has a vast territory with vastly different topographical features and different plant communities. Both tropical and subtropical forests are located within the Tropic of Cancer, and there is also a coniferous forest with high latitudes. The forests in the Yunnan, Guizhou and Sichuan provinces are mostly distributed in the mountainous areas with an altitude of over two thousand meters above sea level, and the gradient of 90% of the forest lands is above 25 degrees. The primeval forests in central and southern China and eastern China are mostly located in remote mountainous areas with steep mountains and narrow valleys, complex. It has formed the unique complexity of timber mining in our country. In the early years after the founding of New China, various provinces in the south of the country adopted various ways of gathering and transporting materials such as chutes, wooden tracks, flat lanes and trolley lanes in the remote forest areas. Although they replaced the backward ways in which people carried their shoulders, the labor intensity was still high. There are still some problems such as long lines, more transport links, low production efficiency, loss of timber and serious soil erosion, which have affected the renewal of forests. In order to promote the development of the mining technology, various types of timber trains and aerial ropeways have emerged in the forest areas of various provinces in the late 1950s. Both the steep mountain slope of the unfavorable factors into a favorable article