【摘要】 通过比较分析4种有代表性的植物竞争指数的预测效果,选择较合适的指标构建太白红杉(Larixchinen-sis)的单木生长模型。研究结果表明:包含对象木胸径、竞争木胸径及对象木与竞争木距离的APA指数能客观反映太白红杉群落植株间的竞争关系;以近2年内胸径相对生长速率为因变量,自身胸径大小和竞争强度为自变量,通过回归分析建立的太白红杉单木生长模型具有较高的回归优度(r=0.916,P<0.05),表明该模型能很好地预测太白红杉的生长。更多还原

【Abstract】 Larix chinensis, listed in Chinese Plant Red Data Book, is a typical endemic species in Qinling Mountain. It is the only tree species that structures the pure forest locates 2600-(3600 m), which has special functions to conserve water, firm mountain stone and maintain water and soil at the timberline area. We present a model for predicting the diameter at breast height (DBH) growth of L. chinensis. Data for this study were collected in Taibai Mountain Natural (Reserve), Shaanxi Province, China. Four samples of 40 m×40 m were investigated and every plant was stem-mapped. Species, DBH, total height, and crown length were recorded for each tree that had reached a diameter of 5 cm at breast height. Area potentially available index (APA), reflecting objectively the competition and growth pattern of L. chinensis, was selected in this paper. Taking subjective DBH and competition index as independent variables and the two yearly DBH relative growth rate as dependent variable, the growth model was established with good regression result. The r-value was 0.916 and the P value was less than 0.05. The model can simulate and predict the growth for L. chinensis efficiently.更多还原