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DOI	10.1016/j.foreco.2019.117658
	Effects of nested plot designs on assessing stand attributes, species diversity, and spatial forest structures
	Lin H.-T.; Lam T.Y.; von Gadow K.; Kershaw J.A.; Jr.
发表日期	2020
ISSN	0378-1127
卷号	457
英文摘要	Nested plot designs are widely applied because they increase efficiency in estimating total volume by using smaller nested subplots to reduce effort in measuring small trees. However, they may not be optimal for characterizing other forest structures. The objectives of this study were to assess the performances of nested plot designs in estimating stand parameters, and local-level species diversity and spatial forest structures through simulation. Three 25–50 ha census plots in tropical and subtropical forests were used. Ten nested plot designs with varying number of nested subplots and diameter at breast height (dbh) thresholds were simulated. Baseline comparison was a circular plot in which all trees were assessed. Results indicated that number of trees per hectare and basal area per hectare were unbiasedly estimated. However, all nested plot designs underestimated species richness and species mingling. Three variations of Clark & Evans Aggregation Index describing spatial forest structures were generally overestimated by the nested plots. Generally, nested plots were less efficient in estimating the forest structures compared to the baseline. This study has demonstrated that nested plot designs may not adequately capture multiple aspects of forest structures, and the need to balance accuracy, efficiency, and field effort. © 2019 Elsevier B.V.
英文关键词	Clark and Evans index; Forest resource inventory; Probability sampling; Spatial stand structure; Tree diversity indices
语种	英语
scopus关键词	Biodiversity; Efficiency; Tropics; Clark and Evans index; Forest resource inventory; Probability sampling; Stand structures; Tree diversity; Forestry; basal area; forest ecosystem; forest inventory; index method; sampling; species diversity; species richness; subtropical region; tree; Biodiversity; DBH; Efficiency; Forestry; Structures; Trees; Tropics
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155600
作者单位	School of Forestry and Resource Conservation, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan; Faculty of Forestry and Forest Ecology, Georg-August-Universität, Göttingen, Germany; Faculty of AgriSciences, Department of Forestry and Wood Science, Stellenbosch University, Matieland, South Africa; Faculty of Forestry and Environmental Management, University of New Brunswick, P.O. Box 4400, 28 Dineen Drive, Fredericton, NB E3B 5A3, Canada
推荐引用方式 GB/T 7714	Lin H.-T.,Lam T.Y.,von Gadow K.,et al. Effects of nested plot designs on assessing stand attributes, species diversity, and spatial forest structures[J],2020,457.
APA	Lin H.-T.,Lam T.Y.,von Gadow K.,Kershaw J.A.,&Jr..(2020).Effects of nested plot designs on assessing stand attributes, species diversity, and spatial forest structures.Forest Ecology and Management,457.
MLA	Lin H.-T.,et al."Effects of nested plot designs on assessing stand attributes, species diversity, and spatial forest structures".Forest Ecology and Management 457(2020).