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于1970年至1984年对我校帽儿山实验林场1958年春栽植的落叶松(Larix gmelini)人工林进行了系统的试验研究。 首先对落叶松人工林进行了以小群体为单元的林木分级,共分五级,即A、B、C、D、E级。每个小群体是以每株林木为中心位置与其相邻的林木所组成的,共七株林木,中心林木一株,周围六株,组成六边形的空间状态。 本试验共分五个组合,第一区抚育强度基本控制在10％、第二区为20％、第三区为30％、第四区为40％、第五区为对照区。 间伐对象:原则是培育A级木、间伐B级木、解放C级木,清除D、E级木,在实施过程中还要因立地条件和林木位置做某些调正。 经过14年的试验结果表明,以对照区第一次间伐后林分蓄积量为100％,第一区为114.9％,第二区为128.4％,第三区为133.1％,第四区为118.5％,属第三区生长量最大。此外,林木径级生长量、生物量、总的重量均有显著增加,由此看出,根据林木竞争状态转移的规律和森林生态经济的理论,而提出的间伐方法是科学的有效的。
A systematic experimental study was conducted on Larix gmelini plantations planted in the Spring of 1958 in Maoershan Experimental Forest Farm of our school from 1970 to 1984. First of all, Larix gmelini plantations were divided into small groups as a unit of forest grading, divided into five levels, namely A, B, C, D, E level. Each small group is composed of trees adjacent to each tree, with a total of seven trees, one tree in the center and six surrounding plants, forming a hexagonal space state. The experiment was divided into five groups. The tending strength in the first area was basically controlled at 10%, the second area at 20%, the third area at 30%, the fourth area at 40% and the fifth area as the control area. Thinning objects: The principle is to cultivate Class A wood, thinning class B wood, liberate Class C wood, remove Class D and Class E wood, but also due to the site conditions and site location during the implementation of certain adjustments. After 14 years of trial, the results showed that after the first thinning in the control plot, the volume of stand was 100%, the first area was 114.9%, the second area was 128.4%, the third area was 133.1% and the fourth area was 118.5 %, Is the largest growth in the third district. In addition, the growth rate, biomass and total weight of tree-diameter growth significantly increased. Therefore, it is scientifically valid to propose the thinning method based on the law of forest-state competition and the theory of forest eco-economy.