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林木个体大小不一致性指标对人工林间伐方式的即时性响应
引用本文:王懿祥,张守攻,陆元昌,孟京辉,曾冀,白尚斌.林木个体大小不一致性指标对人工林间伐方式的即时性响应[J].应用生态学报,2014,25(6):1645.
作者姓名:王懿祥  张守攻  陆元昌  孟京辉  曾冀  白尚斌
作者单位:(;1.浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室, 浙江临安 311300; ;2.中国林业科学研究院资源林业研究所, 北京 100091; ;3.中国林业科学研究院资源信息研究所, 北京 100091; ;4.北京林业大学林学院, 北京 100083)
基金项目:浙江省重点科技创新团队项目(2010R50030-15);“十二五”国家科技支撑计划项目(2012BAD22B0503);浙江农林大学科研启动项目(2013FR015)资助
摘    要:以广西14年生杉木和马尾松人工林为对象,设同一疏伐强度的下层疏伐、上层疏伐、机械疏伐和干扰树间伐4种处理,分别用标准差、变异系数、偏度、Gini系数、库兹涅茨系数和洛伦茨不对称系数6种指标对4种间伐方式下采伐前后林木个体大小差异进行评价.结果表明: 与间伐前相比,马尾松和杉木人工林下层疏伐或上层疏伐后,林木个体材积的标准差、变异系数、Gini系数和库兹涅茨系数均变小,偏度变大;干扰树间伐后标准差、变异系数、Gini系数和库兹涅茨系数均变大,偏度则不一定.马尾松林和杉木林下层疏伐后洛伦茨不对称系数变大,上层疏伐或干扰树间伐后则变小.机械疏伐后各指标无明显变化规律.干扰树间伐后林木个体大小差异性增加,上层疏伐和下层疏伐后林木个体大小差异性减小.洛伦茨曲线、Gini系数和洛伦茨不对称系数均能较好地反映林木个体大小不一致性,可以进行不同林分间个体差异程度静态和动态比较,较好地反映不同间伐方式引起的林木个体差异.洛伦茨不对称系数可以判断林木个体大小不一致性的来源是大树还是小树.近自然森林经营中干扰树间伐措施可以在减小目标树竞争压力的同时拉大林木个体大小差距,有助于保持目标树在林分中的优势地位.


关 键 词:个体大小不一致性  间伐方式  干扰树间伐  洛伦茨不对称系数

Instant response of individual size inequality indices to thinning regimes in plantation.
WANG Yi-xiang,ZHANG Shou-gong,LU Yuan-chang,MENG Jing-hui,ZENG ji,BAI Shang-bin.Instant response of individual size inequality indices to thinning regimes in plantation.[J].Chinese Journal of Applied Ecology,2014,25(6):1645.
Authors:WANG Yi-xiang  ZHANG Shou-gong  LU Yuan-chang  MENG Jing-hui  ZENG ji  BAI Shang-bin
Institution:(;1.Zhejiang Province Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A&F University, Lin’an 311300, Zhejiang, China; ;2.Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; ;Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China; ;4.College of Forestry, Beijing Forestry University, Beijing 100083, China)
Abstract:Four kinds of thinning treatments were designed including thinning from below, thinning from above, mechanical thinning and crop tree relea〖JP2〗se with the same thinning intensity on the 14-year-old pure Cunninghamia laceolata and Pinus massoniana plantations in Guangxi, and 6 kinds of size inequality indices were applied including stand deviation, variation coefficient, skewness, Gini coefficient, Ku〖JP〗znetz coefficient and Lorenz asymmetry coefficient to evaluate the change of individual volume inequality after the 4 kinds of thinning regimes applied. The results showed that stand deviation, variation coefficient, Gini coefficient and Kuznetz coefficient decreased and skewness increased after thinning from below or above compared with before thinning, while after crop tree release these four indices increased and skewness was uncertain. Lorenz asymmetry coefficient increased after thinning from below while it decreased after thinning from above or crop tree release compared with before thinning. There was no distinct rule for the 6 kinds of size inequality indices after mechanical thinning. The size inequality increased after crop tree release while it decreased after thinning from above or below. The study suggested that Lorenz curve, Gini coefficient and Lorenz asymmetry coefficient could be used to compare the size inequality statically and dynamically among different stands, and could be discriminated the difference of size inequality caused by the different thinning regimes. Lorenz asymmetry coefficient even could be applied to tell the size inequality was mainly from the larger or smaller individuals. Crop tree release method in close to nature management could lessen the competition pressures of crop trees and increase the size inequality of the stand effectively which would be helpful to maintain the dominant position of crop trees.
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