DOI: 10.1016/j.foreco.2015.05.016
Scopus记录号: 2-s2.0-84949092038
论文题名: Intra-annual variation of soil respiration across four heterogeneous longleaf pine forests in the southeastern United States
作者: ArchMiller A.A. ; Samuelson L.J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 359 起始页码: 370
结束页码: 380
语种: 英语
英文关键词: Pinus palustris
; Root biomass
; Soil CO2 efflux
; Soil moisture
; Soil temperature
Scopus关键词: Biomass
; Carbon
; Ecology
; Ecosystems
; Moisture
; Sensitivity analysis
; Soil moisture
; Soils
; Longleaf pine ecosystems
; Pinus palustris
; Root biomass
; Soil CO
; Soil temperature
; Spatial and temporal scale
; Temperature sensitivity
; Volumetric soil moistures
; Forestry
; annual variation
; basal area
; belowground biomass
; carbon flux
; coniferous forest
; heterogeneity
; litter
; net ecosystem exchange
; soil moisture
; soil respiration
; soil temperature
; spatiotemporal analysis
; understory
; United States
; Pinus palustris
英文摘要: Soil respiration (RS) is one of the largest fluxes of net ecosystem exchange and is related to both soil climate and vegetatively driven substrate supply at various spatial and temporal scales. Relationships between the intra-annual variation in RS and abiotic and biotic variables were examined across diverse longleaf pine (Pinus palustris Mill.) forests to better understand factors related to RS in these low density, spatially heterogeneous forests. Soil respiration, soil temperature, soil moisture, litter mass, size and proximity of nearby trees, understory cover, and root biomass were measured over 13months in four longleaf pine forests varying in age from 5 to 87years. The exponential relationship between RS and soil temperature accounted for the majority of the intra-annual variation in RS with a corresponding temperature sensitivity (Q10) of 2.18. Soil moisture affected the RS-temperature relationship by dampening RS and Q10 during times of extremely dry soil conditions, as defined by soil moisture ≤50% of the texture-derived wilting point, but volumetric soil moisture did not directly correlate with RS. The intra-annual variation in temperature-normalized RS was negatively related to the distance to nearest tree and positively related to pine root biomass, but not related to litter mass, understory cover, or stand structural variables such as stand age, basal area, or tree density. Annual RS estimates ranged from 12.0Mgha-1 of C in the 5-year-old stand with mostly grass stage seedlings to 13.9Mgha-1 of C in the dense 21-year-old stand. This study contributes to our understanding of carbon fluxes across diverse longleaf pine ecosystems and indicates the importance of climate in determining the carbon sink potential of southeastern longleaf pine forests. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65189
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Forestry and Wildlife Sciences, Auburn University, 3301 SFWS Building, Auburn, AL, United States
Recommended Citation:
ArchMiller A.A.,Samuelson L.J.. Intra-annual variation of soil respiration across four heterogeneous longleaf pine forests in the southeastern United States[J]. Forest Ecology and Management,2016-01-01,359