马尾松人工林林分材种结构预测系统在R软件中的实现

摘要

A program programmed in R language for calculating stand timber assortment construction of Pinus massoniana plantation was introduced in detail through flow charts. The program was composed of three functions, the first one for calculating state of stand%本文结合程序流程图，详细介绍了基于R软件平台的马尾松人工林林分材种结构预测系统。该系统包括3个函数，分别是林分状态及间伐收获预测函数、造材函数和整合函数。程序至少需要给定立地指数、造林密度、采伐年龄和问伐水平共4个参数方可运行，并可进行批处理。系统输出主伐和间伐收获各材种单位面积出材量。实践应用显示，该系统运行效率高，可靠性好，具有很好的应用和后续开发借鉴价值。