福建林学院学报2011，Vol.31Issue(3)：257-261,5.
不同林分密度指标的比较研究
Comparison of different stand density measures
摘要
Abstract
The three stand density measures, including stand density index, relative spacing and ratio of dominant height to nutrient area, were analyzed and compared by using the data obtained year by year during 28-year-old Cunninghamia lanceolata from the different planting density experiment stands. The results show that: (1) The relative spacing of various planting density stands were almost equal after stands reached a certain age, which could not reflect the difference between the different planting densities. So the relative spacing was not an ideal density measure. (2)The models between the age and the stand density measures, including stand density index and ratio of dominant height to nutrient area, were respectively established based on Richards equation by using the Newton iterative method of statistica software, and its characteristic parameters were calculated. The results indicated that these two stand density measures could be properly estimated by these models. And the limit .parameters of Richards equation increased with the increase of planting density, which reflected the difference between the different planting densities. ( 3 ) Compared with the stand density index, the ratio of dominant height to nutrient area was more ideal because it had the characteristics of without parameter, the larger applicable age range and the stable rate parameter etc.关键词
杉木/林分密度指数/相对植距/优势高—营养面积比Key words
Cunninghamia lanceolata/ stand density index/ relative spacing/ ratio of dominant height to nutrient area分类
农业科技引用本文复制引用
张连金,惠刚盈,孙长忠..不同林分密度指标的比较研究[J].福建林学院学报,2011,31(3):257-261,5.基金项目
国家自然科学基金资助项目(30872021). （30872021）
