吕梁山林区日本落叶松与华北落叶松生长比较

Comparison of the Growth of Larix kaempferi and Larix principis-rupprechtii in Lvliang Mountain Forest Area

为了探讨吕梁山林区引种日本落叶松林分的生长规律,更好地为合理经营该地区的日本落叶松人工林提供依据,对吕梁山林区引种30年的日本落叶松进行了样地调查及树干解析,并以华北落叶松为对照,建立起胸径、树高和材积生长过程模型,分析其生长规律。结果表明:(1)同林龄下日本落叶松的胸径、树高、材积均比华北落叶松大。(2)日本落叶松、华北落叶松在吕梁山区的初始间伐期应在第10年左右。(3)日本落叶松的胸径连年生长量与平均生长量在13~14年相交,而华北落叶松则相交于17年。(4)日本落叶松的树高连年生长量与平均生长量约在7年相交,而华北落叶松则相交于19年。(5)日本落叶松、华北落叶松还处于材积生长期,没有到达数量成熟期。

In order to explore the growth law of Larix kaempferi stand introduced in Lvliang Mountain forest area and provide scientific guidance for the rational management of Larix kaempferi plantation in the area,the sample plot survey and trunk analysis of Larix kaempferi introduced in Lvliang Mountain forest area for thirty years were carried out,and taking Larix principis-rupprechtii as a control,the growth process of diameter at breast height,tree height and volumew as established and its growth regularity was analyzed.The results showed as the following five aspects.(1)The DBH,height and volume of Larix kaempferi were better than those of Larix principis-rupprechtii at the same age.(2)The initial thinning period of Larix kaempferi and Larix principis-rupprechtii in Lvliang Mountain area should be around the 10th year.(3)The annual DBH growth and average growth of Larix kaempferi intersected in 13-14 years,while that of Larix principis-rupprechtii intersected in 17 years.(4)The annual growth and average growth of tree height of Larix kaempferi intersected in 7 years,while that of Larix principis-rupprechtii intersected in 19 years.(5)Larix kaempferi and Larix principis-rupprechtii were still in the volume growth stage and had not reached the quantitative maturity stage.