摘要
以藏东南(西藏朗县阶地)巨柏(Cupressus gigantean)为试验材料,采用树干解析法研究其生长特性及最优生长模型。结果表明:(1)68 a巨柏样株的胸径、树高及材积的总生长量随年龄的增长而增长,总生长量分别为:29.8000 cm、12.0000 m、0.2515 m^3,平均生长量分别为0.4400 cm、0.1800 m、0.0037 m3。(2)巨柏样株胸径在65 a之前处于高速生长阶段;41~56 a、65~68 a时间段为树高快速生长时期。(3)材积连年生长量和平均生长量曲线没有交点,即此样株在第68 a时还未达到数量成熟,仍处于单株材积快速生长时期。材积生长率随树龄的增加呈下降趋势,波动幅度较大。(4)胸高形数0~50 a呈先下降后趋于平衡的趋势,50 a以后稳定在0.3000。(5)巨柏树高、胸径、材积最优生长模型为逻辑斯蒂(Logistic)模型。
Taking Cupressus gigantean in southeastern Tibet as the experimental material,the growth characteristics and the optimal growth model were studied by the trunk analysis method.The results showed that the total growth of DBH,height and volume in 68 a of Cupressus gigantean increased with age.The total growth was 29.80 cm,12.00 m,0.2515 m^3,and the average growth was 0.44 cm.0.18 m,0.0037 m^3.The DBH of the Cupressus gigantean was in the highspeed growth stage before 65 a;the periods,41~56 a and 65~68 a were the rapid growth periods of tree height.There was no intersection between the annual growth of the volume and the average growth curve,that was,the sample had not reached the quantitative maturity at 68 a and was still in the period of rapid growth of single plant volume.The growth rate of the volume decreased with the increase of the age of the tree,and the fluctuation range was larger.The shape of the chest height decreased first and then remained in equilibrium and stabilized at 0.3 after 50 a.The optimum growth model of height,DBH and volume of Cupressus gigantean was Logistic model.
作者
李瑛萍
杨小林
赵垦田
姚祺
赵玉文
LI Yingping;YANG Xiaolin;ZHAO Kentian;YAO Qi;ZHAO Yuwen(Resources&Environment College,Tibet Agriculture&Animal Husbandry University,Nyingchi Tibet,860000,China)
出处
《高原农业》
2020年第3期269-276,共8页
Journal of Plateau Agriculture
基金
中国电建集团成都勘测设计研究院有限公司、华能雅鲁藏布江下游水电开发筹备工作办公室技术服务项目(JB人工繁育和大树移栽试验)
研究生创新项目“不同立地环境对巨柏生长的影响研究”(YJS2018-10)。
关键词
巨柏
树干解析
生长特性
生长率
生长模型
Cupressus gigantean
stem analysis
growth characteristic
growth rate
growth process model
