[1]徐扬,刘勇*,李国雷,等.间伐强度对油松中龄人工林林下植被多样性的影响[J].南京林业大学学报(自然科学版),2008,32(03):135-138.[doi:10.3969/j.jssn.1000-2006.2008.03.032]
 XU Yang,LIU Yong*,LI Guo-lei,et al.Effects of the thinning intensity on the diversity of undergrowth vegetation in Pinus tabulaeformis plantations[J].Journal of Nanjing Forestry University(Natural Science Edition),2008,32(03):135-138.[doi:10.3969/j.jssn.1000-2006.2008.03.032]
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间伐强度对油松中龄人工林林下植被多样性的影响
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《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

卷:
32
期数:
2008年03期
页码:
135-138
栏目:
研究简报
出版日期:
2008-05-20

文章信息/Info

Title:
Effects of the thinning intensity on the diversity of undergrowth vegetation in Pinus tabulaeformis plantations
文章编号:
1000-2006(2008)03-0135-04
作者:
徐扬1刘勇1*李国雷1郭蓓1李瑞生2
1. 北京林业大学省部共建森林培育与保护教育部重点实验室, 北京 100083; 2. 北京市园林绿化局, 北京 100029
Author(s):
XU Yang1 LIU Yong1* LI Guo-lei1 GUO Bei1 LI Rui-sheng2
1. Beijing Forestry University, Key Laboratory for Silviculture and Conservation Ministry of Education, Beijing 100083, China; 2 Beijing Municipal Bureau of Landscape and Forestry, Beijing 100029, China
关键词:
间伐强度 油松 林下植被 物种多样性
Keywords:
Thinning intensity Pinus tabulaeformis Undergrowth vegetation Species diversity
分类号:
S718
DOI:
10.3969/j.jssn.1000-2006.2008.03.032
文献标志码:
A
摘要:
<正>利用异步电动机机械特性曲线,分析了变频调速异步电动机在拖动直线型负载和推进器型负载时转差率随频率的变化规律。结果表明:变频调速异步电动机拖动直线型负载时,频率改变而转差率不变;拖动推进器型负载时,转差率的改变不仅与频率有关,还与电机的额定转差率有关。在近似计算时,可以认为变频后的转差率与额定转差率之比,等于变频后的频率与额定频率之比的平方。
Abstract:
The index species diversity was used to discussing the stand or fall of intermediate cutting intensity. The result showed that, the number of the family, the genus, and the species of undergrowth vegetation species increased with thinning increasing. Species diversity, evenness index and richness index increased as well. There were some changes in the life-form spectrum and of plant community of Pinus tabulaeformis. The results also showed that the density o1" plant community of half mature P. tabulaeformis needed be further tended and thinned. The density should be controlled below 1 900-2 200 tree/hm2.

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更新日期/Last Update: 2013-05-20