Article (Scientific journals)
Landscape representation by a permanent forest plot and alternative plot designs in a Typhoon Hotspot, Fushan, Taiwan
Peereman, Jonathan; Hogan, James Aaron; Lin, Teng-Chiu
2020In Remote Sensing, 12 (4), p. 660
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Keywords :
Forest disturbances; Forest permanent plots; Landscape ecology; Representativeness; Typhoon; Fushan experimental forest; Landscape heterogeneities; Normalized difference vegetation index; Permanent plot; Topographical variations; Earth and Planetary Sciences (all)
Abstract :
[en] Permanent forest dynamics plots have provided valuable insights into many aspects of forest ecology. The evaluation of their representativeness within the landscape is necessary to understanding the limitations of findings from permanent plots at larger spatial scales. Studies on the representativeness of forest plots with respect to landscape heterogeneity and disturbance effect have already been carried out, but knowledge of how multiple disturbances affect plot representativeness is lacking-particularly in sites where several disturbances can occur between forest plot censuses. This study explores the effects of five typhoon disturbances on the Fushan Forest Dynamics Plot (FFDP) and its surrounding landscape, the Fushan Experimental Forest (FEF), in Taiwan where typhoons occur annually. The representativeness of the FFDP for the FEF was studied using four topographical variables derived from a digital elevation model and two vegetation indices (VIs), Normalized Difference Vegetation Index (NDVI) and Normalized Difference Infrared Index (NDII), calculated from Landsat-5 TM, Landsat-7 ETM+, and Landsat-8 OLI data. Representativeness of four alternative plot designs were tested by dividing the FFDP into subplots over wider elevational ranges. Results showed that the FFDP neither represents landscape elevational range (<10%) nor vegetation cover (<7% of the interquartile range, IQR). Although disturbance effects (i.e., DVIs) were also different between the FFDP and the FEF, comparisons showed no under-or over-exposure to typhoon damage frequency or intensity within the FFDP. In addition, the DVIs were of the same magnitudes in the plots and the reserve, and the plot covered 30% to 75.9% of IQRs of the reserve DVIs. Unexpectedly, the alternative plot designs did not lead to increased representation of damage for 3 out of the 4 tested typhoons and they did not suggest higher representativeness of rectangular vs. square plots. Based on the comparison of mean Euclidian distances, two rectangular plots had smaller distances than four square or four rectangular plots of the same area. Therefore, this study suggests that the current FFDP provides a better representation of its landscape disturbances than alternatives, which contained wider topographical variation and would be more dicult to conduct ground surveys. However, upscaling needs to be done with caution as, in the case of the FEF, plot representativeness varied among typhoons.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Peereman, Jonathan  ;  Université de Liège - ULiège > Sphères ; Biodiversity Program, Taiwan International Graduate Program, Biodiversity Research Center, Academia Sinica and National Taiwan Normal University, Nankang District, Taipei, Taiwan ; Department of Life Science, National Taiwan Normal University, Wenshan District, Taipei, Taiwan
Hogan, James Aaron ;  Department of Biological Sciences, Florida International University, Miami, United States
Lin, Teng-Chiu;  Department of Life Science, National Taiwan Normal University, Wenshan District, Taipei, Taiwan
Language :
English
Title :
Landscape representation by a permanent forest plot and alternative plot designs in a Typhoon Hotspot, Fushan, Taiwan
Publication date :
February 2020
Journal title :
Remote Sensing
eISSN :
2072-4292
Publisher :
MDPI AG, Basel, Che
Volume :
12
Issue :
4
Pages :
660
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
Funding: This research is supported by grants from the Ministry of Science and Technology (MOST 107-2313-B-003-001-MY3).
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