Using airborne LiDAR to determine total sapwood area for estimating stand transpiration in plantations

This study offers an unprecedented opportunity to estimate total sapwood area over an entire catchment (Aₛcₐₜ/Ag) using small‐footprint light detection and ranging technology with a minimal amount of labour in field. Forty‐two‐year‐old plantations of Japanese cypress (Hinoki; Chamaecyparis obtusa Si...

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Bibliographic Details
Published in:	Hydrological processes Vol. 29; no. 24; pp. 5071 - 5087
Main Authors:	Saito, Takami, Yamamoto, Kazukiyo, Komatsu, Misako, Matsuda, Hiroki, Yunohara, Shuji, Komatsu, Hikaru, Tateishi, Makiko, Xiang, Yang, Otsuki, Kyoichi, Kumagai, Tomo'omi
Format:	Journal Article
Language:	English
Published:	Chichester Wiley 29-11-2015 Blackwell Publishing Ltd Wiley Subscription Services, Inc
Subjects:	Catchments Chamaecyparis obtusa Cryptomeria japonica Cupressus Estimates Japanese cedar Japanese cypress Lidar Light detection and ranging local maximum filtering Plantations remote sensing sapflow measurement Silver stand density management diagram Stands Trees INW, Japan
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Summary:	This study offers an unprecedented opportunity to estimate total sapwood area over an entire catchment (Aₛcₐₜ/Ag) using small‐footprint light detection and ranging technology with a minimal amount of labour in field. Forty‐two‐year‐old plantations of Japanese cypress (Hinoki; Chamaecyparis obtusa Sieb. et Zucc.) and Japanese cedar (Sugi; Cryptomeria japonica D. Don) vegetated the 2.98 ha experimental catchment. Field observations identified diameter at breast height (DBH) of all trees and produced the relationship between DBH and tree sapwood area (Aₛₜᵣₑ). The sum of Aₛₜᵣₑ generated actual values of Aₛcₐₜ/Ag. For light detection and ranging data analyses, local maximum filtering revealed height of tree apices (H) and tree number (N) with 9% omission errors. A novel process was developed to identify tree species by their apices based on height of the apices and canopy roughness. Four methods were tested. In Methods A–C, H was converted to Aₛₜᵣₑ directly or via DBH, then, the sum of Aₛₜᵣₑ created Aₛcₐₜ/Ag. H–Aₛₜᵣₑ or H–DBH relationships were varied irrespective of labour‐intensive measurements, and Aₛcₐₜ/Ag was underestimated up to 85% of actual value because of the smaller N. On the other hand, in Method D, ready‐made stand density management diagrams (SDMDs) overestimated mean DBH. However, a product of overestimated mean Aₛₜᵣₑ and the underestimated N was almost identical to the actual Aₛcₐₜ/Ag. The estimates were 84% and 95% of the true Aₛcₐₜ/Ag in Hinoki and Sugi, respectively, and the former will be more precise if the SDMD is suitable for the site as indicated through sensitivity analysis. Copyright © 2015 John Wiley & Sons, Ltd.
Bibliography:	http://dx.doi.org/10.1002/hyp.10482 ark:/67375/WNG-776Z4DH9-D istex:F5FEB65F62CB3C74A966576D00F18AADE7283C7A Core Research for Evolutional Science and Technology (CREST) Japanese Ministry of Agriculture, Forestry and Fisheries ArticleID:HYP10482 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0885-6087 1099-1085
DOI:	10.1002/hyp.10482