湿地松人工林间伐强度效应分析

Effects of Different Thinning Intensities on Slash Pine Plantations

对赣东北中等立地上的两片６年和９年生、造林密度分别为２５００株／ｈｍ２和１１１０株／ｈｍ２的湿地松林分进行了间伐强度对比试验。５ａ后的结果表明，前者以１２７５株／ｈｍ２，后者以５２５株／ｈｍ２的保留密度，可以显著提高林分的胸径和蓄积生长量，改善立木的径级结构，并能有效地缩短轮伐期。对湿地松林的初植密度和初次间伐龄进行了讨论，认为造林密度１５００株／ｈｍ２左右，１０～１２ａ时作中强度间伐，对培育大径材较为适宜。

The thinning intensities comparision tests were conducted on two slash pine plantations of 6 a and 9 a,with planting densities of 2 500 and 1 110 trees/hm 2 respectively in NE Jiangxi Province. It was found after 5 years,the reserved tree density of 1 275 trees/hm 2 for the first and 525 trees/hm 2 for the second would significantly hasten the diameter and standing volume growth ,improve the stand structure,and effectively shorten the rotation age. The planting density and first thinning age of slash pine plantations were discussed, it was considered suitable to plant about 1 500 trees/hm 2 and carry out moderate to heavy thinning in about the 10～12th year for the production of large dimension timber of slash pine.