湿地松人工林生长规律

The Growth Rules of Slash Pine Plantation

采用连续测定资料,分析了广西华山林场11年生湿地松（Pinus ellottii）松脂原料林的生长过程及林分结构。结果表明：湿地松胸径生长高峰出现在第3年,6年生前为速生期,随后胸径生长量快速下降;胸径分布随年龄的增加由左偏逐步转为右偏,在6年生时趋于正态分布;林分树高连年生长量波动大,无明显变化规律,连年生长量均值为0.62 m,8年生前为速生期,树高分布为右偏,优势木相对较少,林相较为整齐;自然整枝在8年生时最强烈,枝下高年上升1.20 m,适宜在7年生时进行适当修枝间伐抚育;单株材积生长率在11年前均大于10%,处于速生期。湿地松在该试验区适应性良好,若以8.0、10.0、12.0 cm作为最小起始采脂胸径,则在湿地松林分5-6年生、7-8年生或11年生以后采脂即可获得较高的利用率。

The growth process and the stand structure of the raw material forest of 11 - year - old Pinus elliottii was analyzed at Huashan forest farm in Guangxi with the help of continuous measurement. The results showed that the growth peak of DBH appeared in the third year, the first six years was the fast growing period and DBH increment fell down fast. The DBH distribution was from left to right with the in- erease of age gradually and it showed normal distribution in 6 years old. The current annual increment of stand height was of big fluctuation and had no obvious change, and the mean current annual increment was 0. 62 m. The fast growing period was before 8 years old, the height distribution was right deviation with less dominant trees and more regular forest form. There hada strongest natural training in eight years with an annual increase of 1.2 m, was suitable in 7 years when proper pruning thinning tending. The first 11 years was the fast growing period when stand individual volume growth rate was greater than 10%. Comprehensive analysis showed that Pinus eUiottii in the test area had a good adaptability. In terms of 8.0 cm, 10 cm or 12 cm as minimum initial tapping DBH, resin tapping would obtain a high utilization rate in the age of 5 - 6 years old, 7 - 8 years old or afterll years old.