柳桂地区台湾杉木人工林单株生长的距离依赖竞争措施

Q4 Agricultural and Biological Sciences
Dar-Hsiung Wang, Shyh-Chian Tang, Han-Ching Hsieh, Chih-Hsin Chung, Chien-Yu Lin
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引用次数: 4

摘要

当可利用资源不足以满足树木种群对最佳生长的总需求时,林分内树木之间就会发生竞争。六个距离依赖的竞争措施,包括树木的大小和与邻居的距离,在不同的竞争区域进行评估,用来评估树木之间的竞争压力。采用相对于所涉及的非竞争指数的均方误差减小来判断3个生长成分(即胸径、基底面积和体积)的每个竞争指数的表现。结果表明,除Martin-Ek外,3种生长成分的其他竞争指标均与周期生长呈极显著相关(p < 0.0001)。竞争指数在预测5年增长中的表现表明,在增长预测模型中加入竞争指数将平均平方误差从体积增长的14%降低到胸径增长的17%。此外,扩大鹤夷竞争指数的搜索范围对竞争效应的估计能力略有提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distance-Dependent Competition Measures for Individual Tree Growth on a Taiwania Plantation in the Liuguei Area
Competition among trees within a stand occurs when resource availability is insufficient to meet the total requirements of a tree population for optimal growth. Six distance-dependent competition measures that incorporate tree sizes and distances from neighbors, evaluated over varying competition zones, were used to assess the competition stress among trees. A reduction in the mean square error relative to the no-competition index involved was used to judge the performance of each competition index for 3 growth components (i.e., diameter at breast height (DBH), basal area, and volume). The results showed that except for Martin-Ek, the other competition indices investigated were significantly correlated with periodic growth in the 3 growth components (p < 0.0001). The performance of the competition indices in predicting 5-yr growth indicated that the inclusion of competition indices in the growth-prediction model reduced the mean square error from 14% for volume growth to 17% for DBH growth. Moreover, expanding the search zones in the Hegyi competition index was found to have slightly improved the ability to estimate competition effects.
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来源期刊
Taiwan Journal of Forest Science
Taiwan Journal of Forest Science Agricultural and Biological Sciences-Forestry
CiteScore
0.20
自引率
0.00%
发文量
0
期刊介绍: The Taiwan Journal of Forest Science is an academic publication that welcomes contributions from around the world. The journal covers all aspects of forest research, both basic and applied, including Forest Biology and Ecology (tree breeding, silviculture, soils, etc.), Forest Management (watershed management, forest pests and diseases, forest fire, wildlife, recreation, etc.), Biotechnology, and Wood Science. Manuscripts acceptable to the journal include (1) research papers, (2) research notes, (3) review articles, and (4) monographs. A research note differs from a research paper in its scope which is less-comprehensive, yet it contains important information. In other words, a research note offers an innovative perspective or new discovery which is worthy of early disclosure.
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