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当前位置: 首页 > 文章 > 刺槐无性系人工林干形与削度研究 山东农业大学学报(自然科学版) 1993 (S1) 19-25
Position: Home > Articles > STUDIES ON THE STEM FORM AND TAPER OF BLACK LOCUST CLONAL PLANTATIONS Journal of Shandong Agricultural University(Natural Science Edition) 1993 (S1) 19-25

刺槐无性系人工林干形与削度研究

作  者：
邢黎峰;粱玉堂;龙庄如
关键词：
刺槐;无性系;变形削度函数;复共线性;岭回归
摘  要：
本文选择 Kozak 变形削度函数,研究了石林、箭杆两个刺槐无性系的林木削度,以条件数 K 为指标对 Kozak 方程的复共线进行了诊断,采用岭回归与剔除自变量两种方法打破了方程的复共线性,利用岭迹法剔除自变量获得的方程与 Perez 方程一致。以均方误差MSE、平均偏差 Bias、平均绝对偏差|Bias|为指标评价了不同拐点位置的 Kozak、Perez 方程的拟合精度与预测精度,确定拐点为20%的 Kozak 岭回归方程与 Perez 线性回归方程为两无性系的削度方程。
译  名：
STUDIES ON THE STEM FORM AND TAPER OF BLACK LOCUST CLONAL PLANTATIONS
作  者：
Xing Lifeng;Liang Yutang;Long Zhuangru Department of Forestry, Shandong Agric. Univ. Tainn, China 271018
关键词：
black locust;;clone;;variable-form taper funtion;;multicollinearity;;ridge regression
摘  要：
Kozak's variable-form taper function was adopted to approach the stem form of “Shilin”and“Jiangan”the clone of black locust.The multicollinearity of Kozak taper e- quation was judged by the condition number(K).The multicollinearity was broken with the ridge regression and the method of eliminating independent variables by ridge trace. The equation with less parameters derived from Kozak's uniformed with Perez's.The ac- curacy and precision of fitting and prediction of the sequence of Kozak's and Perez's taper models with different locations of the inflection point were evaluated by use of the follow- ing indicators:[1]Mean square error(MSE);[2]Mean bias(BIAS);[3]Average abso- lute bias(|BIAS|).The results of selecting the‘best’reduced and predictive model showed the Kozak's ridge estimate model and Perez's least square estimate(LSE)model with 20% location of the inflection point were better than others.

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