年度 2019
全部作者 Lin H-T, Lam TY, von Gadow K, Kershaw JA
作者類別 Corresponding Author
論文名稱 Effects of nested plot designs on assessing stand attributes, species diversity, and spatial forest structures
期刊名稱 Forest Ecology and Management
卷數 47
起頁 117658
期刊等級 SCI
總頁數 8
發表日期 2020-02-01
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 to 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.
語言 英文
參考連結 https://www.sciencedirect.com/science/article/pii/S0378112719317207
所屬計畫案 MOST 105-2628-B-002-010-MY3