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辽东山区长白落叶松人工林天然更新障碍分析
引用本文:朱教君,刘足根,王贺新.辽东山区长白落叶松人工林天然更新障碍分析[J].应用生态学报,2008,19(4):695-703.
作者姓名:朱教君  刘足根  王贺新
作者单位:1. 中国科学院沈阳应用生态研究所清原森林生态实验站,沈阳,110016
2. 江西省环境科学研究院,南昌,330013
3. 大连大学综合研究中心,辽宁大连,116622
基金项目:中国科学院"百人计划" , 国家自然科学基金 , 国家科技支撑资助项目
摘    要:通过对辽东山区不同间伐强度下长白落叶松林内种子库,种子萌发,幼苗出现、成活与生长的观测,分析了长白落叶松天然更新的主要影响因素.结果表明:40年生落叶松人工林的种子雨中,有30%的种子有活力,可以满足天然更新的需要;土壤种子库的种子主要分布在枯枝落叶层,4月下旬林内种子开始萌发,6月幼苗数量达到最大,幼苗累计出现率与间伐强度(光照)之间无显著相关,只受到地被物的影响;随间伐强度的增加,幼苗平均存活率提高,但林下幼苗生长缓慢,苗高均不超过6 cm;林内当年幼苗9月全部消失,没有超过1年生的幼苗,但皆伐迹地的更新幼苗存活较多、生长良好.初步确定地被物和光照是辽东山区长白落叶松天然更新的主要障碍因子.

关 键 词:辽东山区  长白落叶松  人工林  天然更新  间伐  辽东山区  长白落叶松人工林  天然更新  障碍分析  eastern  Liaoning  Province  regions  Larix  olgensis  natural  regeneration  主要障碍因子  皆伐迹地  苗高  生长缓慢  存活率  影响因素  地被物  相关  光照  出现率  苗数  枯枝落叶层
文章编号:1001-9332(2008)04-0695-09
收稿时间:2007-09-03
修稿时间:2007年9月3日

Obstacles for natural regeneration of Larix olgensis plantations in montane regions of eastern Liaoning Province, China.
ZHU Jiao-jun,LIU Zu-gen,WANG He-xin.Obstacles for natural regeneration of Larix olgensis plantations in montane regions of eastern Liaoning Province, China.[J].Chinese Journal of Applied Ecology,2008,19(4):695-703.
Authors:ZHU Jiao-jun  LIU Zu-gen  WANG He-xin
Affiliation:Qingyuan Experimental Station of Forest Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shen- yang 110016, China. jiaojunzhu@iae.ac.cn
Abstract:Based on the field investigations about the seed bank, seed germination, seedling emergence, and seedling survival and growth in the Larix olgensis plantations with different thinning intensities and various ground preparations in the montane regions of eastern Liaoning Province, the main factors affecting the natural regeneration of L. olgensis were analyzed in this paper. The results showed that in the seed rain of 40 years old L. olgensis plantation, 30% of the seeds had viability, which could meet the needs of natural regeneration. The seeds in soil seed bank mainly distributed in litter layer, and the seedlings younger than one-year old emerged in April and reached the peak in June. The accumulative emergence rate of the seedlings had no significant correlation with thinning intensities, but was affected by ground preparations. The average survival rate of appeared seedlings increased with increasing thinning intensities, but the seedling growth was generally slow in the plantation stands, e.g., the seedling height was less than 6 cm, and most of the seedlings disappeared in September. In the plantation stands, it was difficult to find the L. olgensis seedlings elder than one-year; but in the clear-cut area with enough light and less ground cover, more seedlings could survive and grew well. Based on the above mentioned results, it was concluded that the main obstacles for the natural regeneration of L. olgensis plantations in montane regions of eastern Liaoning Province could be light intensity and ground cover.
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