火地塘林区铁杉生长规律研究

Growth law of Tsuga chinensis in Huoditang Forest Region

【目的】探讨火地塘林区铁杉的生长规律,为合理保护和培育铁杉珍稀资源提供参考。【方法】以火地塘林区铁杉解析木资料为基础,运用SPSS软件进行回归分析,分别建立了铁杉胸径、树高、材积与树龄的数学模型,用标准地调查的实测值验证模型的精确性。用根据解析木得到的生长量实测值与模型预测的理论值分别绘制胸径、树高、材积平均生长量和连年生长量曲线,并对其生长规律进行分析。【结果】建立的生长模型拟合效果较好。铁杉胸径连年生长量的最大值出现在35-45年,105-115年仍保持较高的生长水平;平均生长量在45年以前逐年提高,45年后稳定在一个较高的水平。树高生长在10年以内生长缓慢,连年生长量最大值出现在35-45年和105-125年,平均生长量在树龄大于10年后一直维持在一个稳定的水平。材积连年生长量和平均生长量的最大值出现在105年以后。【结论】建立的生长模型准确性高,可用于铁杉生长规律的预测。铁杉是寿命较长、生长缓慢、但持续生长时间较长的树种,在其生命周期内有2个速生期,分别是在树龄35-45年和105-125年。

【Objective】 The study is to find the growth law of Tsuga chinensis in Huoditang region in order to provide the reference of reasonable protecting and nurturing rare resources of Tsuga chinensis.【Method】 Based on the data of the analytical trees in Huoditang region,this paper used SPSS software to build the optimal growth models of diameter,tree height and volume.The data collected from the investigation plots were used to check the accuracy of the models.According to the data of the analytical trees and the predictable data,we drew the average growth curve,year after year growth curve compactly and studied the growth law deeply.【Result】 The result showed that the residuals were very little which indicated the growth models had better performance.During the age of 35-45 years,the year after year growth of DBH reached the maximum.This growth still kept higher lever during the age of 105-115 years.Average growth increased year by year before the age of 45 years.After that,this growth still kept a higher velocity steadily.Before the age of 10 years,the height grew slowly.After that,average growth maintained a steadily lever.The peak growth of the tree height appeared during the age of 35-45,105-125 years.The year after year growth of volume reached the maximum after the age of 105 years.But the mean growth of volume didn＇t meet the top value at the age of 150 years,which indicated Tsuga chinensis had not arrived the amateur age at the age of 150 years.【Conclusion】 The models we built had good performance and could be used to predict the growth law of Tsuga chinensis.Tsuga chinensis has a longer life expectancy,slow growth,but the continuous growth of the trees longer has two life cycles respectively at the age of 35-45,105-125 years.