长白落叶松(Larix olgensis)工业人工林的模拟间伐

Simulating thinning of Larix olgensis industrial plantation

应用马尔柯夫过程理论，在获得林分直径转移概率的基础上，采用间伐最小径阶林木，最大径阶林木，中间径阶林木三种间伐方式，在保留不同密度情况下对长白落叶松工业人工林进行模拟间伐，提出了适宜的保留密度和相应的抚育间伐对象。结果表明：马尔柯夫过程确能反映长白落叶松工业人工林的直径转移过程，利用马尔可夫过程理论对长白落叶松工业人工林进行模拟间伐实现了依据培育时间来确定间伐方法和措施，提高了长白落叶松工业人工林经营管理的精准性；长白落叶松工业人工林成林后的间伐无论从培育森林方面，还是从取得木材、加大林分收益方面考虑，都应该以间伐小径阶的林木为主，注重培育Ⅰ、Ⅱ级木，间伐Ⅲ，Ⅳ级木；20～25a长白落叶松工业人工林间伐后的保留经营密度以0．7为宜。

Based on getting the trees diameter transfer probability, the thinning of the Larix olgensis plantation was simulated by Markov process theory according to three methods such as thinning the smallest diameter trees, thinning the largest diameter trees and thinning intermediate trees. The suitable reserved density and thinning trees were confirmed after simulated thinning of Larix olgensis plantation. It is shown that Markov process theory can indeed reflect the diameter transfer process of Larix olgensis industrial plantation. By simulated thinning Larix olgensis industrial plantation with Markov process theory, the thinning method and measure according to cultivation time was achieved, the precision for managing Larix olgensis industrial plantation was raised. The small diameter trees should be thinned as the dominant not only considering from the point of cultivating forest but also from obtaining wood and increasing forest benefit. Class Ⅰ trees and class Ⅱ trees should be reserved, class Ⅲ trees and class Ⅳ trees should be thinned. The suitable management density for 20 - 25 years old Larix olgensis industrial plantation is 0.7.