在木材采运工业的全部生产活动中,即由产品的生产地点至产品外运,要有适当长的延续时间,并分布在较大的区域.从伐区伐木到木材装到铁路车辆或船舶上至少亦需要数十天,而有时企业受季节的影响甚至长达几个月之久,从完成木材头道生产工序的伐区到木材装车外运场地的运距有的长达百余公里.在这种条件下木材生产过程的节奏性和连续性还将受到气候和其他如林分组成、设备工作的可靠性等条件的影响.引起木材生产不均衡的原因分类如下图所示. All productive activities in the timber handling industry, from the point of manufacture of the product to the outward transportation of the product, shall be of reasonably long duration and shall be distributed over a larger area, from logging to timbering in the logging area to rail vehicles or ships On the dozens of days, and sometimes the business is affected by the seasons for as long as a few months, from the completion of the timber production processes to the cutting area to the timber loading and unloading venues and some more than a hundred Km. The rhythm and continuity of the timber production process under such conditions will also be influenced by climate and other conditions such as stand composition, equipment reliability, etc. The causes of unbalanced timber production are shown below.