冀北山地华北落叶松混交次生林生长过程研究

Study on the Growth Process of Larix principis-rupprechtii Mixed Secondary Forest in Northern Hebei Mountainous Area

华北落叶松是冀北山地最重要的用材和生态树种。本文以河北省木兰围场国有林场龙头山分场华北落叶松混交次生林为研究对象,通过树干解析,分析其生长过程。研究表明:在所测树龄(97 a)范围内,胸径和树高总增长量均是逐年增加,材积还处于快速增长阶段。华北落叶松胸径、树高生长过程符合Richards模型,材积的生长过程符合Gompertz模型。依据所拟合的生长过程曲线可推测出华北落叶松数量成熟龄为120 a左右,是培育大径材的理想树种。

Larix principis-rupprechtii is the most important timber and ecological tree species in Mountain Area of Northern Hebei Province.The research object of this paper is the Larix principis-rupprechtii mixed secondary forest in the Longtoushan Paddock of Hebei Mulan Paddock State Forest.Its growth process through trunk analysis was analyzed.The research showed that the growth of DBH and tree height is increasing year by year within the range of the measured tree age(97 a)and the volume is in the stage of rapid growth at the same time.The growth process of diameter at DBH and height of Larix principis-rupprechtii conforms to the Richards model and the growth process of volume conforms to the Gompertz model.According to the fitted growth process curve,it can be inferred that the number and maturity of Larix principis-rupprechtii is about 120 a,which is an ideal tree species for cultivating large diameter wood.