【摘要】 调查了青檀 (PteroceltistatarinowiiMaxim .)人工林不同经营措施对林分地上部分生物生产力及檀皮产量的影响。结果表明 :(1)在密度及墩龄相同条件下 ,单位面积檀皮产量与年龄成正比 ,出皮率与年龄成反比 ;(2 )单位面积檀皮产量年增长以第 3年为最高 ,分别是第 2年和第 4年年增长量的 1 5 8倍和 4 12倍 ;(3)在密度、留萌数及萌发年龄相同条件下 ,单位面积檀皮产量以条墩年龄 12年为最高 ,分别是 6年生和 9年生的 3 32倍和 1 11倍 ;(4)四种造林密度类型 (2 5 0 0、3333、42 0 0和 5 35 0墩 hm2 )中 ,檀皮产量大小顺序为 42 0 0 >3333>5 35 0 >2 5 0 0。 42 0 0墩 hm2 (株行距 1.4m× 1 7m)的林分檀皮产量是 2 5 0 0墩 hm2 (株行距 2m× 2m)林分檀皮产量的 1 6 8倍 ;(5 )在密度、墩龄相同条件下 ,每墩留萌数为 10时 ,单位面积檀皮产量最高。从收获经济生物量 (檀皮 )的角度考虑 ,青檀人工林密度应在 3333～ 42 0 0墩 hm2 之间 ,轮伐期为 3年 ;在条墩年龄为 9年以上的人工林中 ,留萌数以 10条为好。更多还原

【Abstract】 Based on the investigation of 33 plots in Jing County and Qingyang County, the effects of management practice on above\|ground biomass and phloem yields were analysed. The results indicated that: (1) In the \%Pteroceltis tatarinowii \%Maxim. plantations with same density and same stump age, pholem production (kg/hm\+\{2\}) increased, but the rate of phloem to above\|ground biomass (%) decreased with the increasing of sprout age. (2) For the sprouts with different age, the highest annual increment of phloem to above\|ground biomass occurred in the third year, which is 1.58 times of the second year, 4.12 times of the fourth year. (3) In the same density but different stump age, the phloem production (kg/hm\+\{2\}) of \%P. tatarinowii \%plantations increased with the increasing of stump age and the highest productivity of phloem occurred in the stands with 12\|year\|old stump, which is 3.32 times of the stand with the 6\|year\|old stump, and 1.11 times that of the 9\|year\|old stump.\ (4) Within four planting densities (2 500, 3 333, 4 200 and 5 350 stumps/hm\+\{2\}),the highest production of phloem took place in the stand with 4 200 stumps/hm\+\{2\}, reaching 3 765 kg/hm\+\{2\}, which is 1.68 times of the stand with 2 500 stumps/hm\+\{2\}. The ranking of phloem production was in the order 4 200>3 333>5 350>2 500 stumps/hm\+\{2\}. (5) In the stands with 3 333 stumps/hm\+\{2\}and 9\|year\|old stump, the highest production of phloem was achieved in the stand with 10 sprouts on each stumps. On the basis of the results, we suggest that 3 333～4 200 stumps/hm\+\{2\}should be chosen as a planting density, 3 years should be chosen as a harvesting cycle and 10 sprouts on each stump should be an option for the stands with over 9\|year\|old stumps in the practice so that high phloem production can be obtained.更多还原