摘要
采用均匀典型整群抽样调查法,调查了白龙江林区人工云杉落叶病发生严重地区的40块样地,每标准样地按不同病级对40株云杉进行了解析,并利用计算机辅助设计推导出了云杉落叶病材积损失率估测模型。研究结果表明,云杉落叶病使云杉树高平均年生长量减少12.4%～78.1%,云杉直径平均年生长量减少10.4%～71.1%,材积平均年生长损失率为13.0%～90.12%。检验结果表明,该材积损失率估测模型预测准确,精度高。
<Abstrcat>Forty spruce afforestation plots with serious spruce-needle-dropping were selected with evenly grouping principle in Bailongjiang forest plantations.Forty trees with different disease seriousness were sectioned and analyzed.Relations between the disease seriousness and the height,breast height diameter,average cubage growth,total cubage loss and the loss proportion of the trees were obtained by CAD.The correlation between the disease index and the total cubage loss,the loss proportion of the trees were also gained.Speculated models with high precision of the cubage loss rate of the pine needle dropping disease were then set up.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2005年第6期64-68,共5页
Journal of Northwest A&F University(Natural Science Edition)
基金
甘肃省自然科学基金项目(2R-93-065)
