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作 者 ：方升佐 徐锡增 单兴寿 曹福亮 唐罗忠

期 刊 ：林业科学 1996年 32卷 4期 页码：334-341

关键词：美洲黑杨；生物量生产；分配模式；养分输出量；材性；

Keywords:Eastern cottonwood, Biomass production, Distribution model, Nutrients exported, Wood quality,

摘 要 ：以美洲黑杨2个无性系为供试材料,研究杨树超短轮伐期经营中地上部分生物量生产、分配模式、N、P、K的输出量及材性。结果表明,在3种密度和3种轮伐期的组合中,2个无性系均以造林密度为10000株·ha^-1、轮伐期为3年的林分生物生产力最高,I-69杨为10.52t·ha^-1·a^-1,NL-80351杨约为12.00t·ha^-1·a^-1;在生物量的分配比率和作为造纸材的经济生物量上也以这种组合模式最为合理,经济生物量最大,I-69杨为7.14t·ha^-1·a^-1,NL-80351杨为8·47t·ha^-1·a^-1。养分输出量的多少与林分的生物量生产和分配比率密切相关。轮伐期为3年,密度为10000株·ha^-1的林分N、P、K的输出量最高,I-69杨为33.97kg·ha^-1·a^-1,NL-80351杨为38.50kg·ha^-1·a^-1,但NL-80351杨每生产1吨经济生物量所输出的N、P、K总量略低于I-69杨。杨树超短轮伐期经营中生产出的木材都可用作中、低档的造纸原料,其中I-69杨的制浆性能优于NL-80351杨。

Abstract:The above-ground biomass production, distribution model, nutrients exported and wood quality characteristics of eastern cottonwood were studied in minirotation management systems among the combinations of 3 densities and 3 rotations, The stand, with planting density of 10000 plant·ha^-1 and 3 years rotation, could obtain the hightest biomass production 10. 52t·ha^-1·a^-1 for clone I-69 and about 12.00t. ha^-1·a^-1 for clone NL-80351. The economic biomass production for pulp-making was also the hightest in the stand of 10000 plant·ha^-1 and 3-year-rotation, respectively 7.14t. ha·^-1·a^-1 for clone I-69 and 8. 47 t ·ha^-1·a^-1 for clone 8. 47t·ha^-1·a^-1. Nutrients exported from the minirotation management systems bear close correlation to the biomass production and distribution model. In the stand of 10000 plant·ha^-1 and 3-year-rotation, the amount of nutrients exported (N,P and K) were 33. 97kg·ha^-1·a^-1 for clone I-69 and 38. 50kg·ha^-1·a^-1 for clone NL-80351. However,the amount of nutrients exported for producing one metric ton of economic biomass was slightly lower for clone NL-80351 than for clone I-69.The timber produced from the minirotation management systems is a good pulp-making material, but the wood quality of clone I-69 is slightly superior to clone NL-80351.

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