| Effects of thinning on microsites and natural regeneration in a Larix olgensis plantation in mountainous regions of eastern Liaoning Province, China |
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| 作者姓名： | LIU Zu-gen ZHU Jiao-jun HU Li-le WANG He-xin MAO Zhi-hong LI Xiu-fen ZHANG Li-jun |
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| 作者单位： | [1]Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110010, P.R. China [2]Graduate School, Chinese Academy of sciences, Beijing, 100039, P. R. China [3]Dalian University, Dalian, 116622, P. R. China [4]Forestry Bureau of Qingyuan Manzu Autonomous County, Liaoning Province, 113300, P. R. China |
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| 基金项目： | This study was supported by “the 100-Young-Research Project” of Chinese Academy of Sciences and National Natural Science Foundation of China （30371149） |
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| 摘 要： | In order to understand the effects of thinning on microsite conditions and natural regeneration in the larch plantation, thinning experiment was conducted in a 40-year-old Larix olgensis plantation in Qingyuan County in eastern Liaoning Province, China in 2003-2004 Five thinning treatments （0%, 10.2%, 19.8%, 29.7% and 40.3% thinned） were designed on the same site. After thinning, canopy openness and the microsite conditions such as photosynthetic photon flux density （PPFD）, soil moisture content, and soil temperature were measured in one growing season. Meanwhile, the investigation of natural regeneration was conducted at the end of the growing season. The results showed that the canopy openness increased with the increase of thinning intensities. PPFD and soil temperature and soil moisture content in different soil layers were positively relative with canopy openness after thinning. The richness of regenerating tree species did not significantly increase （p=0.30） after one growing season since thinning, but the regeneration density and frequency of tree species increased significantly （p〈0.05）. In addition, the number of regenerating tree species increased, and the increment was correlated with the characteristics of iudividual tree species. The increasing percentage of regenerating seedlings of the shade-intolerant tree species was more than that of shade-tolerant tree species. Among the investigated regeneration species, the biggest response of seedling emergency to the canopy openness was Phellodendron amurense. This paper confirmed the following conclusions： after thinning, the variety of regenerating tree species was correlative with the characteristics of regenerating tree species, and the distribution of unthinned trees and the site conditions in the investigated larch plantation were the additional factors influencing, the regeneration.
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| 关 键 词： | 辽宁 人造林 森林更新 自然再生 |
| 文章编号： | 1007-662X（2005）03-0193-07 |
| 收稿时间： | 2005-04-10 |
| 修稿时间： | 2005-06-20 |
Effects of thinning on microsites and natural regeneration in aLarix olgensis plantation in mountainous regions of eastern Liaoning Province, China |
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| LIU Zu-gen ZHU Jiao-jun HU Li-le WANG He-xin MAO Zhi-hong LI Xiu-fen ZHANG Li-jun.Effects of thinning on microsites and natural regeneration in a Larix olgensis plantation in mountainous regions of eastern Liaoning Province, China[J].Journal of Forestry Research,2005,16(3):193-199. |
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| Authors: | Liu Zu-gen Zhu Jiao-jun Hu Li-le Wang He-xin Mao Zhi-hong Li Xiu-fen Zhang Li-jun |
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| Institution: | (1) Institute of Applied Ecology, Chinese Academy of Sciences, 110016 Shenyang, P. R. China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, P. R. China;(3) Dalian University, 116622 Dalian, P. R. China;(4) Forestry Bureau of Qingyuan Manzu Autonomous County, 113300 Liaoning Province, P. R. China |
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| Abstract: | In order to understand the effects of thinning on microsite conditions and natural regeneration in the larch plantation, thinning
experiment was conducted in a 40-year-oldLarix olgensis plantation in Qingyuan County in eastern Liaoning Province, China in 2003–2004. Five thinning treatments (0%, 10.2%, 19.8%,
29.7% and 40.3% thinned) were designed on the same site. After thinning, canopy openness and the microsite conditions such
as photosynthetic photon flux density (PPFD), soil moisture content, and soil temperature were measured in one growing season.
Meanwhile, the investigation of natural regeneration was conducted at the end of the growing season. The results showed that
the canopy openness increased with the increase of thinning intensities. PPFD and soil temperature and soil moisture content
in different soil layers were positively relative with canopy openness after thinning. The richness of regenerating tree species
did not significantly increase (p=0.30) after one growing season since thinning, but the regeneration density and frequency of tree species increased significantly
(p<0.05). In addition, the number of regenerating tree species increased, and the increment was correlated with the characteristics
of individual tree species. The increasing percentage of regenerating seedlings of the shade-intolerant tree species was more
than that of shade-tolerant tree species. Among the investigated regeneration species, the biggest response of seedling emergency
to the canopy openness wasPhellodendron amurense. This paper confirmed the following conclusions: after thinning, the variety of regenerating tree species was correlative
with the characteristics of regenerating tree species, and the distribution of unthinned trees and the site conditions in
the investigated larch plantation were the additional factors influencing the regeneration.
Foundation item: This study was supported by “the 100-Young-Research Project” of Chinese Academy of Sciences and National Natural Science
Foundation of China (30371149)
Biography: LIU Zu-gen (1975-), male, Ph D candidate of Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016,
P. R. China.
Responsible editor: Song Funan |
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| Keywords: | Larix olgensis plantation Thinning Microsite Natural regeneration |
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