【摘要】 <正> 作者于1971—1984年间对我校帽儿山实验林场老山人工林实验站于1958年春栽植的落叶松人工林,进行了间伐抚育试验,共间伐两次,收到了良好的效果,现仅就间伐木的选择及林木自然稀疏规律进行分析。 一、林木的自然稀疏过程与以间伐Ⅱ级木为主的闻伐方式 组成森林的林木,在整个生命过程中,随着林木林龄增加,直径、树高等均在不断更多还原

【Abstract】 A new concept on thinning was proposed in 1971 that trees in class Ⅰ be developed, in class Ⅱ thinned, in class Ⅲ and Ⅳ released and in class Ⅴ removed. Since then, observations at the same trees on the same sites have been made three times on the experimental stands where cuttings with different intensities were done. Based on the data obtained from the observations, the definitions of mierosites, the ambiguous concentration of tree distribution and its subordinate functions are presented according to the ambiguously mathematical theories. The trees are classified in accordance with optimum subodinate principle. The probability matrix for trees shifting from one class to another is formed, on the assumption that it is a Markovian process. The transitional trend is analyzed, which provides evidences for the earlier proposed thinning concept.更多还原