【摘要】 山东省临沂地区杨树人工林地位指数表是于1986年冬至1987年春,收集了25株69杨、72杨和健杨优势木树干解析和104块临时标地材料编制而成。选用lgH=a+b(1/A)公式为导向曲线数学模型;标准年龄定为8a;指数级距2m;级数8个(12—26m)。采用树高相对值法导出各指数级各年龄树高值,经检验此法精度较高,符合生长快、伐期短的杨树生长规律,可供该地区林业部门试用。更多还原

【Abstract】 Data of 25 stems analysis of dominant trees and 104 sample plots of Pcpulus deltoides cv. "Lux" I-69/55,Populus euramericana "San Martino" I-72/58 and Populus curamericana Robusta were collected in the poplar plantations in Linyi Region, Shangdong Province from the winter of 1986 to thespring of 1987. The formula log H=a+b was chosen as a mathematicalmodel of guiding curve. The standard age was 8-year-old. There were 8 grades with a range of 2 m(12-16 m) in the site-index table and method of height growth correlative value was adopted to establish it. It proved to be of high accuracy after testing and is considered to be useful for the forest institutions in Linyi Region, Shangdong Province.更多还原