... composition of catch 渔获物组成 large timber 大径材 hybrid dynamic system 混合动态系统 ...
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... 张炜银1 关键词 ：杉木；大径材；密度控制；动态规划 [gap=4574]key words :chinese fir; big diameter wood; controlling of stand density; dynamic programming ..
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Stand in wide planting could gain great economic benefit from high stock of big-diameter wood in long cutting period.
疏植的经济效益,在长周期以培育大径材为经营目的时达到最高。
参考来源 - 尾巨桉大径材培育——密度技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
及时合理地调控结构，可显著提高中、大径材比例及出材率，又能维持较高林地生产力。
Rational and timely regulation and control can greatly enhance the proportion of medium and big diameter of wood and the rate of producing wood and maintain a higher productivity of woodland.
而传统使用长材刨片机、消耗大径级原木的技术，则成为历史。
Traditional way of using direct flakers which leads to consume large diameter logs becomes the history.
淮阴是我国引种栽培意大利杨树最早的地区之一，其大径级优质材主要用于胶合板的生产。
In China, Huaiyin is one of the earliest areas in introducing poplars from Italy. The big diameter and high quality trees are mainly used to producing plywood.
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