[Effects of gap size on seedling natural regeneration in artificial Pinus tabulaeformis plantation].
[Effects of gap size on seedling natural regeneration in artificial Pinus tabulaeformis plantation].
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发表时间：
2012-11
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通讯作者：
Wenjuan Han;Xiao Yuan;Wenhu Zhang
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作者：
Wenjuan Han;Xiao Yuan;Wenhu Zhang
为明确间伐林隙大小对油松人工林幼苗自然更新的影响，通过样地调查研究了不同生境下1 ~ 10年生油松人工林幼苗的生态因子和年龄结构、针叶高度、针叶直径、针叶长度、根、茎、针叶干生物量，并对影响油松人工林幼苗更新的环境因子进行了通径分析。不同林隙大小和坡向的生态因子存在明显差异。林下3年以上苗木缺乏，小林隙7年以上苗木缺乏，大林隙5、6年以上苗木较少。1-10年树龄的幼苗可分为3个发育阶段，即1-3年树龄、4-7年树龄和8-10年树龄，其中1-3年树龄的幼苗对种群的建立和生长至关重要。不同生境下幼苗生长情况依次为：阴坡大间隙>阳坡大间隙>阳坡小间隙>阴坡小间隙>阳坡林下灌木>阴坡林下灌木。通径分析表明，光照强度对不同生育期的幼苗数量有决定性的正向影响，灌木盖度对4-7年和8-10年的幼苗数量有决定性的负向影响，腐殖质干质量对4-7年的幼苗数量有负向影响，而对8-10年的幼苗数量有正向影响。建议在油松人工林的管理中，应采取相对高强度的间伐与灌木清除相结合的方式，为油松种群的可持续发展提供有利条件。
To clarify the effects of gap size created by thinning on the seedling natural regeneration in artificial Pinus tabulaeformis plantation, a plot investigation was conducted to study the ecological factors and the age structure, height, diameter, length of needles, and dry biomass of roots, stems, and needles of 1-10 year-old seedlings in different habitats, and a path analysis was made on the environmental factors affecting the seedling regeneration. Obvious differences were observed in the ecological factors in different size gaps and slope aspects. There lacked of above 3 year-old seedlings in understory and of above 7 year-old seedlings in small gap, and the seedlings of 5 and 6 year-old were lesser in big gap. The 1-10 year-old seedlings could be divided into 3 development phases, i. e. , 1-3 year-old, 4-7 year-old, and 8-10 year-old seedlings, among which, 1-3 year-old seedlings were critical for the establishment and growth of the population. The growth situation of the seedlings in different habitats was in order of big gap in shady slope > big gap in sunny slope > small gap in sunny slope > small gap in shady slope > understory in sunny slope > understory in shady slope. Path analysis showed light intensity had decisive positive effects on the seedling number of different development phases, shrub coverage had decisive negative effects on the seedling number of 4-7 year-old and 8-10 year-old phases, whereas humus dry mass had negative effects on the seedling number of 4-7 year-old but positive effects on the seedling number of 8-10 year-old. It was suggested that in the management of artificial P. tabulaeformis plantation, relatively high intensity thinning combined with shrub clearing should be adopted to provide favorable conditions for the sustainable development of P. tabulaeformis population.