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林业科学 ›› 2013, Vol. 49 ›› Issue (7): 34-39.doi: 10.11707/j.1001-7488.20130705

• 论文与研究报告 • 上一篇    下一篇

栓皮栎伐桩萌苗保留量对其生长和生物量积累的影响

易青春, 张文辉, 唐德瑞   

  1. 西北农林科技大学西部环境与生态教育部重点实验室 杨凌 712100
  • 收稿日期:2012-10-09 修回日期:2012-12-18 出版日期:2013-07-25 发布日期:2013-07-23
  • 通讯作者: 张文辉
  • 基金资助:

    林业公益性行业科研专项(201004011);国家自然科学基金项目(30872018);陕西省重点基础研究项目(2009JZ005)。

Effects of Reserved Sprout Number per Stump on Sprout Development and Biomass Accumulation of Quercus variabilis

Yi Qingchun, Zhang Wenhui, Tang Derui   

  1. Environment and Ecology Key Laboratory of Education Ministry in West China, Northwest A&F University Yangling 712100
  • Received:2012-10-09 Revised:2012-12-18 Online:2013-07-25 Published:2013-07-23

摘要:

以秦岭南坡商洛地区栓皮栎次生林皆伐后的伐桩萌苗为研究对象,通过对不同生境条件下伐桩萌生幼苗监测,分析阴坡阳坡2个生境不同萌苗保留量对栓皮栎伐桩萌苗生长和生物量累积的影响。结果表明: 1) 皆伐后5年期间,2个生境条件下伐桩萌苗数量从伐后第2年开始减少,第4年数量趋于稳定。2) 2个生境条件下,不同萌苗保留量监测表明,伐桩随着萌苗数量增多,萌苗平均基径、高度、冠幅减少。3) 栓皮栎伐桩不同萌苗保留量监测表明: 萌苗基径、高度均为阳坡>阴坡; 与对照(自然生长)相比,确定萌苗保留量之后,伐桩萌苗基径、高度增长迅速,4年之后减缓; 2个生境条件下栓皮栎伐桩萌苗随着萌苗保留量增多,高度、基径增长幅度降低。4) 皆伐5年之后,2个生境条件下不同萌苗保留量栓皮栎伐桩萌苗器官生物量为主干>侧枝>叶片; 随着栓皮栎伐桩萌苗保留量增多,伐桩萌苗生物量呈现先增多后减少的趋势,保留3个萌苗的伐桩萌苗生物量最大。萌苗保留量对栓皮栎伐桩萌苗生长和生物量累积影响显著; 留萌栓皮栎伐桩保留1个萌苗有利于萌苗生长, 保留3个生物量积累较多。选择不超过3个的留萌数量,更能实现不同目的的次生林培育。

关键词: 栓皮栎, 伐桩, 保留萌苗数量, 生物量积累

Abstract:

In this study, effects of sprouting number of Quercus variabilis on the seedlings growth and biomass accumulation were investigated with the 103 stumps in Qinling Mountain. Four treatments of removing sprouts were applied on the stumps after clearcutting, i.e. no removal of sprouts serving as control, reserving 1 sprout, 3 sprouts or 5 sprouts per stump with all other sprouts removed. The results showed that the number of sprouts per stump reduced from the second year and then tent to stabilize the number in the fourth year after clearcutting during 5 years observation. Different treatments profoundly influenced sprout growth. The mean diameter, height, and crown of sprouts were decreased with the increasing of sprout number per stump. The basal diameter and height of Q. veriabilis sprouting seedlings under different treatments showed that: sunny slope>shady slope; Compared with the control, basal diameter, and height of the reserved sprouting seedlings grew more rapidly in the first 3 year. The basal diameter and height of sprouts decreased with the increasing of the reserved sprout number. For 5 years after clearcutting, the biomass of sprout various components under different treatments in two habitats was ranked as: item>branch>leaf. With the reserved sprout numbers per stump increased, the total sprout biomass increased at first and then reduced, and the 3 sprouting seedlings reserved produced the most biomass. The result indicated that sprout numbers reserved on each Q. variabilis stump had significantly influence on sprouting seedling growth and biomass accumulation. The 1 sprout per stump reserved facilitated the seedling growth, while 3 sprouts per stump reserved favored to total seedling biomass accumulation. Reservation of no more than 3 sprouts per stump would achieve the different purposes to the secondary forest cultivation.

Key words: Quercus variabilis, stump, reserved sprout number, biomass accumulation

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