2021年12月8日 星期三
经营措施对青檀人工林生物量及檀皮产量的影响
The effects of management practice on above-ground biomass production and phloem production of Pteroceltis tatarinowii Maxim.plantations
2001年 第10卷 第1期 页码[21-24]    下载全文[0.7MB]  
摘要

调查了青檀( Pteroceltis tatarinowii Maxim .) 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 1.58 倍和 4.12 ;( 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 ;( 4)四种造林密度类型( 2 500 3 3334 200 5 350 hm2) , 檀皮产量大小顺序为 4 200>3 333 >5 350>2 5004 200hm2 ( 株行距 1.4m ×1.7m) 的林分檀皮产量是 2 500 hm2 ( 株行距 2m ×2m) 林分檀皮产量的 1.68 ;( 5) 在密墩龄相同条件下, 每墩留萌数为 10 , 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 3 3334 200 hm2之间, 轮伐期为 3 ;在条墩年龄为 9 年以上的人工林中, 留萌数以 10 条为好
 

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 /hm2 ) 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 /hm2 ) 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/ hm2) , the highest production of phloem took place in the stand with 4200 stumps hm2, reaching 3 765 kg/ hm2, which is 1. 68 times of the stand with 2 500 stumps hm2 . The ranking of phloem production was in the order 4200>3 333>5 350>2 500 stumps hm2 . ( 5) In the stands with 3 333 stumps hm2 and 9year-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~ 4200 stumps hm2 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.

关键词青檀; 人工林; 生物生产力; 檀皮产量; 经营措施
Key wordsPteroceltis tatarinowii Maxim.; plantation; biomass productivity; phloem production; management practice
作者方升佐1, 李光友1, 李同顺2, 惠 超2
所在单位1.南京林业大学, 江苏 南京 210037;2.安徽省青阳县林业局, 安徽 青阳 242800
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基金项目国家自然科学基金资助项目( 39970608) 的部分研究内容