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本文根据在内蒙古采伐的25年生二青杨解析木生长量资料,与该地区同时期的气候资料进行关联分析,求得影响二青杨生长的主要气候因素是干燥度;然后用干燥度分别与高、径、材积生长量资料建立了GM(0,2)静态模型;最后应用Verhulst动态模型进行了材积预测分析。结果表明,二青杨在11,22树龄期间,年材积生长量最快,可达到0.015-0.0017立方米,然后生长速度趋于下降,到30树龄时,仅为0.001立方米,就应该采伐更新。
Based on the analysis of wood growth data of 25-year-old Populus euphratica cut in Inner Mongolia and the correlation analysis with the same period climatic data in this area, the main climatic factor influencing the growth of Populus euphratica is dryness. Then, The GM (0,2) static model was established by using the data of height, diameter and volume growth. Finally, the volume prediction was carried out by Verhulst dynamic model. The results showed that Populus euphratica had the fastest annual volume growth during 11 and 22 years of age, reaching 0.015-0.0017 cubic meters, and then the growth rate tended to decline. At the age of 30, only 0.001 cubic meters, it should be logged .