滇西地区湿地松人工林生长过程分析

Growth Process Analysis of Pinus elliottii in Western Yunnan

为评价湿地松在滇西地区的生长适应性,选择30余年生湿地松与乡土树种云南松人工林,基于样地调查,采用平均木法进行树干解析,分析比较其生长过程。结果表明,在林分水平上,湿地松的胸径、树高、枝下高、冠幅明显大于云南松;湿地松和云南松的胸径、树高、材积生长过程基本一致,其中胸径连年生长量随树龄增大呈逐渐降低趋势,树高连年和平均生长量随林龄增加呈先增加后降低趋势,材积连年和平均生长量则呈递增趋势,仅造林26年后材积连年生长量稍有降低。相对于云南松而言,湿地松的胸径、树高、材积连年和平均生长量更大,速生期开始时间早,持续时间更长;但30余年生时两个树种均未达数量成熟龄。由此可知,湿地松非常适宜在滇西地区推广种植。本研究为湿地松在滇西及相关地区的大面积推广应用提供了理论支撑。

In order to evaluating the growth adaptation of Pinus elliottii in Western Yunnan,about 30 years old P.elliottii and P.yunnanensis plantations were chosen and mean trees were sampled for stem analysis based on plot investigation.Diameter at breast height,tree height,height to crown base and crown diameter of P.elliottii were significantly larger than those of P.yunnanensis.The growth process of diameter at breast height,tree height and individual volume of P.elliottii showed no significant difference compared with P.yunnanensis.The current annual increments of diameter at breast height decreased with tree age,the mean and current annual increments of tree height increased with tree age initially and then decreased,the mean and current annual increments of individual volume increased with tree age and there was only a decrease after planted 26 years.Compared to P.yunnanensis,the mean and current annual increments of diameter at breast height,tree height and individual volume were much higher,the fast growth period began much earlier and lasted much longer.At the present tree age(35 years old for P.elliottii and 38 years old for P.yunnanensis),both P.elliottii and P.yunnanensis did not reach the quantitative maturity.Consequently,P.elliottii is very suitable for planting and expanding in Western Yunnan and the present study provides scientific evidences for introducing and expanding of P.elliottii in Western Yunnan and related prefectures.