辽东山区长白落叶松人工林生长规律的研究

Growth Regularity of Larix olgensis Plantation in Mountainous Regions of Eastern Liaoning Province,China

以辽东山区长白落叶松为研究对象，通过解析44株不同林龄的长白落叶松，建立起胸径、树高和材积生长模型，并对其生长过程进行分析研究。结果表明：采用Korf方程拟合辽东山区长白落叶松胸径、树高和材积生长模型效果最好，群值分别为0．956、0．956和0．937，3个方程都能很好地反映其生长规律，能够用于辽东山区长白落叶松人工林生长过程的预测。长白落叶松胸径连年生长量的最大值出现在第7年，平均生长量的最大值出现在第16年，连年生长量与平均生长量相交时间出现在17-20a；树高连年生长量最大值出现在第6年，平均生长量最大值出现在第13年，连年生长量与平均生长量相交的时间在12～14a。长白落叶松在生长初期材积增长缓慢，308以后材积生长速度较快，但是直到56a时，也没有达到数量成熟林，说明长白落叶松材积生长较慢。此外，根据长白落叶松的生长过程提出了其不同生长时期应该采取的主要经营管理措施。

In order to find out the growth regularity of Larix olgensis plantations in mountainous regions of eastern Liaoning Province, China, 44 analytic trees with different ages were selected to study the growing process by stem analysis. Models of the growth of diameter at breast height （DBH）, height （H）, and vol- ume （V） were established. The results showed that the Korf model was the optimum one for the descrip- tion of growth process of DBH, H, and V. Moreover, three growth modes displayed good prediction accu- racy, and with the values of prediction accuracy of 0. 956, 0. 956, and 0. 937, respectively. The growth models could fit the growth process precisely. The maximum of current annual increment of DBH was at 6 --10 a, the maximum of average growth at 16--20 a, the two curves intersected at 14--18 a; the peak of current annual increment of H at 6--11 a, the peak of average growth at 10--13 a, the current annual in- crement intersect with the average growth at the age of 10--17. At the early age, L. olgensis starts to grow slowly in volume, after 30 years the volume grows fast, while it doesn＇t achieve the number of mature forest until the age of 56, it means the slow growth of L. olgensis timber volume. In addition, main management measures of L. olgensis were suggested according to its growth process.