DOI: 10.1016/j.foreco.2014.05.025
Scopus记录号: 2-s2.0-84902084627
论文题名: Changes in soil organic carbon and nitrogen following forest expansion on grassland in the Southern Alps
作者: Guidi C. ; Vesterdal L. ; Gianelle D. ; Rodeghiero M.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 328 起始页码: 103
结束页码: 116
语种: 英语
英文关键词: Carbon sequestration
; Forest succession
; Grassland abandonment
; Land-use change
; Mineral soil
; Soil C/N ratio
Scopus关键词: Biomass
; Ecosystems
; Electrostatic devices
; Electrostatic discharge
; Expansion
; Land use
; Minerals
; Nitrogen
; Soils
; Carbon sequestration
; Forest succession
; Grassland abandonment
; Land-use change
; Mineral soils
; Soil C/N ratio
; Forestry
; abandoned land
; carbon sequestration
; grassland
; land use change
; range expansion
; soil carbon
; soil nitrogen
; soil organic matter
; succession
; Biomass
; Carbon
; Chelation
; Ecosystems
; Electrostatic Charge
; Forests
; Land Use
; Nitrogen
; New Zealand
; South Island
; Southern Alps
英文摘要: The dominant land-use change in the Southern Alps is grassland abandonment, followed by forest expansion. Forest expansion is commonly thought to increase ecosystem C sequestration, but contradictory results have been reported. Our objective was to investigate soil organic carbon (SOC) and nitrogen (N) changes after forest expansion on abandoned grasslands. A land use and management gradient was identified in a subalpine area of Trentino (Italy) comprising four successional stages: (i) managed grassland (manG), mown and manured annually for more than 100. years; (ii) grassland abandoned 10. years ago (abanG), with shrubs and Picea abies saplings; (iii) early-stage forest (earlyF), dominated by P. abies established on grassland abandoned around 1970; and (iv) old forest (oldF), dominated by Fagus sylvatica and P. abies, representing a reference for long-term forest land use. Organic and mineral soil layers were collected down to 30. cm at eight points within three plots for each successional stage. Significantly more SOC was stored in organic layers of oldF compared with other successional stages and the organic layer N stocks were higher in oldF compared with manG and abanG. The SOC and N concentrations were higher in the top 10cm mineral soil of grassland plots compared with forest. The earlyF and oldF stored, on average, 28-35% less SOC in top 10cm mineral soil compared with manG and abanG when stocks were calculated using equivalent soil mass (ESM) and equivalent soil depth (ESD) approaches respectively. SOC stocks in mineral soil (0-30cm) calculated with ESD decreased from manG to oldF; when accounting for total stone content, SOC stocks in earlyF and oldF were 40% and 50% lower than in manG, respectively. The inclusion of organic layers offset mineral SOC stock differences when only stones <5cm were accounted for, but when considering the total stone content, SOC stocks in earlyF remained significantly lower (-31%) than in manG. Tree biomass contributed to higher ecosystem C stocks in oldF, which stored 82-93Mgha-1 of C more than grasslands. Our study revealed a decrease in total SOC stocks after forest expansion on abandoned subalpine grasslands. Tree biomass development contributed to increasing C storage, especially in a long-term forest land use. Forest management should consider that tree biomass and organic layer development require a minimum time period following grassland abandonment to compensate for the decrease in mineral SOC stocks and contribute positively to climate change mitigation. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65853
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Sustainable Agro-Ecosystems and Bioresources, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all'Adige, TN, Italy; Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark; Foxlab Joint CNR-FEM Initiative, Via E. Mach 1, 38010 San Michele all'Adige, TN, Italy
Recommended Citation:
Guidi C.,Vesterdal L.,Gianelle D.,et al. Changes in soil organic carbon and nitrogen following forest expansion on grassland in the Southern Alps[J]. Forest Ecology and Management,2014-01-01,328