武陵山区马尾松林下混交楠木模式初探

Preliminary Study on Mixed Phoebe Mode under Pinus massoniana Forest in Wuling Mountain Area

摘要: 为了评估武陵山区低效马尾松林最佳改造模式，选择楠木作为混交树种，设置3个不同保留密度样地，每个样地设置3个楠木混交模式，按2 m × 3 m、2 m × 4 m、2 m × 5 m的株行距开展楠木混交试验，从平均地径生长情况看，在1200株/hm²下，设置为2 m × 4 m的混交模式下楠木生长最好，其次是1200株/hm²下，设置为2 m × 3 m模式，1500株/hm²下，设置成2 m × 3 m模式楠木生长最差。从平均树高来看，900株/hm²下，设置为2 m × 4 m模式楠木平均树高生长最快。土壤化学性质分析发现，混交模式下氮磷钾含量均有提高，但pH变化不明显。通过武陵山区低效马尾松林混交模式改造，以期为低产低效林提供科学改造方法。

Abstract: In order to evaluate the best transformation mode of low-efficiency Pinus massoniana forest in Wuling mountain area, Phoebe zhennan was selected as a mixed tree species, three different thinning retention densities were set up, and three Phoebe zhennan mixed modes were set up in each plot. According to the plant row spacing of 2 m × 3 m, 2 m × 4 m and 2 m × 5 m, the Phoebe zhennan mixed test was carried out. From the average ground diameter growth, at the 1200 plants per hectare, the Phoebe zhennan growth was the best under the mixed mode of 2 m × 4 m, followed by the 1200 plants per hectare, set to 2 m × 3 m mode, 1500 plants per hectare, set to 2 m × 3 m mode Phoebe zhennan growth is the worst. From the perspective of average tree height, at 900 plants per hectare, the average tree height of Phoebe zhennan in the 2 m × 4 m mode is the fastest growing. The comparison of soil chemical properties showed that the content of nitrogen, phosphorus and potassium increased in the mixed mode, but the change of PH was not obvious. Through the transformation of the mixed mode of low-efficiency Pinus massoniana forest in Wuling mountain area, in order to provide scientific transformation methods for low-yield and low-efficiency forests.