基于竞争势的林分生长量分配模型研究

以湖南省攸县黄丰桥林场杉木林分2008年至2011年每木检尺调查结果为数据源,开展对开阔比数模型fo,简单竞争因子模型fH和竞争压力指数模型fCSI的研究,提出一个新的林木综合竞争因子即竞争势模型fC=1/(fo+fH+fCSI),计算结果经过残差分析方法剔除异常,以竞争势为依据将林分总体生长量分配到林木个体,构建林分生长量分配模型.为了验证模型的准确性,对比分别以fC、fH、fCSI三个模型为依据的林分生长量分配结果,计算通过模型分配到个体的生长量与个体实际生长量之间的相关指数分别为0.6,0.44,0.29.分析结果表明竞争势模型可以作为林分生长可视化模拟中林分生长量向个体分配的一个依据,为林分生长可视化模拟提供有效支持.

Study on Stand Growth Distribution Model

The mechanism restriction and the interactive impact of the competition play important roles in stand growth. To realize the simulation of stand growth, the competition models to distributing the overall growth increment of stand to each individual tree in the stand were studied. With Chinese fir (Cunninghamia lanceolata) artificial stand in Huangfengqiao Forest Farm, Hu'nan Province, as the researching subject, the Open Comparison model f_O, Simple Competition Index model f_H, and Competition Pressure Index model f_CSI were developed. From the three models, a new model Competition Index Model f_C=1/(f_O+f_H+f_CSI) was propounded. After eliminating the outliers, the f_C was used as a parameter to propound a stand growth distribution model to distribute the overall growth increment of stand to each individual tree in the stand. Then the results of f_H, f_CSI and f_C were compared. Analysis of covariance was used to test the differences in correlation coefficient. It was concluded that the f_C could be an efficiency function to use on the growth stand visualization.