DOI: 10.1016/j.foreco.2014.10.007
Scopus记录号: 2-s2.0-84949116826
论文题名: And yet it shrinks: A novel method for correcting bias in forest tree growth estimates caused by water-induced fluctuations
作者: Chitra-Tarak R. ; Ruiz L. ; Pulla S. ; Dattaraja H.S. ; Suresh H.S. ; Sukumar R.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 336 起始页码: 129
结束页码: 136
语种: 英语
英文关键词: Above-ground biomass
; Carbon
; Permanent sampling plot
; Reversible stem flexing
; Seasonally dry tropical forest
; Tree shrinkage
Scopus关键词: Budget control
; Carbon
; Climate change
; Ecology
; Shrinkage
; Surveys
; Above ground biomass
; Interannual variability
; Permanent sampling plot
; Resource availability
; Reversible stem flexing
; Seasonally dry tropical forests
; Stem diameter change
; Temporal variability
; Forestry
; aboveground biomass
; carbon budget
; census
; diameter
; growth rate
; resource availability
; stem
; tropical forest
; Biomass
; Carbon
; Forests
; Seasonal Variation
; Shrinkage
; Tropical Atmospheres
; India
英文摘要: Accuracy in tree woody growth estimates is important to global carbon budget estimation and climate-change science. Tree growth in permanent sampling plots (PSPs) is commonly estimated by measuring stem diameter changes, but this method is susceptible to bias resulting from water-induced reversible stem shrinkage. In the absence of bias correction, temporal variability in growth is likely to be overestimated and incorrectly attributed to fluctuations in resource availability, especially in forests with high seasonal and inter-annual variability in water. We propose and test a novel approach for estimating and correcting this bias at the community level.In a 50-ha PSP from a seasonally dry tropical forest in southern India, where tape measurements have been taken every four years from 1988 to 2012, for nine trees we estimated bias due to reversible stem shrinkage as the difference between woody growth measured using tree rings and that estimated from tape. We tested if the bias estimated from these trees could be used as a proxy to correct bias in tape-based growth estimates at the PSP scale.We observed significant shrinkage-related bias in the growth estimates of the nine trees in some censuses. This bias was strongly linearly related to tape-based growth estimates at the level of the PSP, and could be used as a proxy. After bias was corrected, the temporal variance in growth rates of the PSP decreased, while the effect of exceptionally dry or wet periods was retained, indicating that at least a part of the temporal variability arose from reversible shrinkage-related bias. We also suggest that the efficacy of the bias correction could be improved by measuring the proxy on trees that belong to different size classes and census timing, but not necessarily to different species.Our approach allows for reanalysis - and possible reinterpretation - of temporal trends in tree growth, above ground biomass change, or carbon fluxes in forests, and their relationships with resource availability in the context of climate change. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65624
Appears in Collections: 影响、适应和脆弱性
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作者单位: Centre for Ecological Sciences, Indian Institute of Science, Bangalore, India; INRA, Agrocampus Ouest, UMR1069, Sol Agro et hydrosystème Spatialisation, Rennes, France; Indo-French Cell for Water Sciences, IISc-IRD Joint Laboratory, Indian Institute of Science, Bangalore, India; Divecha Centre for Climate Change, Indian Institute of Science, Bangalore, India
Recommended Citation:
Chitra-Tarak R.,Ruiz L.,Pulla S.,et al. And yet it shrinks: A novel method for correcting bias in forest tree growth estimates caused by water-induced fluctuations[J]. Forest Ecology and Management,2015-01-01,336