马尾松间伐强度对林下套种格木和木荷存活的影响

Thinning Effects on the Survival of Interplanting Trees Under Pinus massoniana Plantation

以马尾松纯林为对象,在浙江省慈溪市林场设置4种不同间伐强度(T0:0%,T1:25%,T2:45%,T3:65%)的实验样地,间伐后套种木荷和格木2种阔叶树,对其存活率进行为期11年的长期监测。结果表明:木荷存活率在中度间伐下最高,格木存活率在生长前期以轻度间伐下最高,成林之后以中度间伐下最高,总体上2个套种树种均以中度间伐下的存活率最高。格木比木荷更适合在不间伐和轻度间伐下生存,木荷比格木更适应重度间伐下的环境,中度间伐更能创造适宜木荷和格木共同生长的条件。2个套种阔叶树种的存活率在不同间伐强度下存在显著差异(P<0.05)最早出现在种植后第2年,不同阔叶树种的生存会因环境条件的变化和自身树种特性存在差异。在纯林混交化改造中,中度间伐(约45%)可以提高林下套种林木的存活率。

Two kinds of artificial replanting broadleaved tree specieswere used as the research objects to study the survival of replanting tree species under Pinus massoniana plantation after four thinning intensities(T0:0%,T1:25%,T2:45%,T3:65%),which had been monitored for 11 years. The results showed that the survival rate of Schima superba was the highest under moderate thinning, and the survival rate of Erythrophleumfordii was the highest under light thinning in the early growth stage, and then the survival rate would be the highest under moderate thinning after forest formation. In general, the survival rates of the two interplanting tree species were the highest under moderate thinning. Erythrophleumfordii was more suitable for survival under non-thinning and light thinning than Schima superba. Schima superba was more adaptable to the environment under heavy thinning than Erythrophleumfordii,and moderate thinning can create conditions suitable for the co-growth of Schima superba and Erythrophleumfordii. The survival rates of the two interplanting broadleaved tree species were significantly different under different thinning intensities(P<0.05),which started to appear in the second year after planting. The survival of different broadleaved trees will vary due to changes in environmental conditions and the characteristics of their own tree species. Therefore, in pure forest mixed transformation, moderate thinning(45%) can improve the survival rate of interplanting trees.