摘要
基于巴东县国有林场人工针叶同龄混交林标准地的调查数据,采用三参数威布尔分布函数(Weibull)、正态分布函数、伽玛分布函数及对数正态分布函数拟合林分的直径分布,并结合卡方(λ2)检验,试图建立能够准确描述人工针叶同龄林林分直径分布规律的函数和参数,再通过建立的分布函数预测和分析林分径阶株数分布。结果表明:4种分布函数拟合林分直径分布的拟合效果Weibull分布明显优于其余3种分布函数,用Weibull分布拟合效果最好,精度高,能很好地描述针叶同龄混交林直径分布规律;研究发现Weibull分布函数参数a=5.0、b=12.132 3、c=1.821 3时,可以较准确地预测人工针叶同龄混交林林木株数;经过对林分直径株数分布预测结果分析,证明了函数的准确性和适用性较好。根据Weibull分布函数调整林分株数分布,对于提高林分质量、增强林地生产力具有一定的参考价值。
Based on the standard survey data of even-aged artificial needle mixed forests in Badong County, and by adopting three parameters Weibull distribution function, normal distribution function, gamma distribution function and the logarithmic normal distribution function, the plantation＇s diameter distribution were fitted. By combining with 2 testing method, the function that can accurately describe the artificial coniferous plantation diameter distribution law and its parameters were set up, and then through the established distribution function, the stand＇s diameter class and plant number distribution can be predicted and analyzed. The results show that of the four distribution fimctions fitting stand diameter distribution, Weibull distribution is obviously significantly better than the remaining 3 kinds of distribution functions, the Weibull distribution had best fitting effect and high precision, and can describe the even-aged needle mixed diameter distribution very good. Given Weibull distribution function parameters a = 5.0, b = 12.132 3, c = 1.821 3, the tree number of the plantation can accurately predicted, and the prediction results showed that the function＇s accuracy and suitability were very good. The adjustments of stand＇s plant number distribution by using the Weibull distribution function have some reference values in improve the quality of forest stands and enhance forest land productivity.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2013年第9期38-41,54,共5页
Journal of Central South University of Forestry & Technology
基金
林业公益性行业科研专项"林业资源多层次信息服务技术研究"(201304215)
关键词
针叶混交林
同龄混交林
分布函数
直径分布
拟合效果
coniferous mixed forest
even-aged mixed conifers plantation
distribution function
diameter distribution
fitting effect
