DOI: 10.1007/s10533-017-0416-8
Scopus记录号: 2-s2.0-85039859372
论文题名: Soil carbon stocks across tropical forests of Panama regulated by base cation effects on fine roots
作者: Cusack D.F. ; Markesteijn L. ; Condit R. ; Lewis O.T. ; Turner B.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 2018-01-02 起始页码: 253
结束页码: 266
语种: 英语
英文关键词: Aboveground biomass
; Clay
; Litterfall
; Phosphorus
; Precipitation
; Rainforest
Scopus关键词: aboveground biomass
; carbon cycle
; cation
; clay soil
; climate modeling
; fine root
; growth
; litterfall
; organic carbon
; phosphorus
; phytomass
; precipitation (chemistry)
; rainfall
; rainforest
; soil carbon
; soil fertility
; soil texture
; tropical forest
; tropical soil
; Panama [Central America]
英文摘要: Tropical forests are the most carbon (C)-rich ecosystems on Earth, containing 25–40% of global terrestrial C stocks. While large-scale quantification of aboveground biomass in tropical forests has improved recently, soil C dynamics remain one of the largest sources of uncertainty in Earth system models, which inhibits our ability to predict future climate. Globally, soil texture and climate predict ≤ 30% of the variation in soil C stocks, so ecosystem models often predict soil C using measures of aboveground plant growth. However, this approach can underestimate tropical soil C stocks, and has proven inaccurate when compared with data for soil C in data-rich northern ecosystems. By quantifying soil organic C stocks to 1 m depth for 48 humid tropical forest plots across gradients of rainfall and soil fertility in Panama, we show that soil C does not correlate with common predictors used in models, such as plant biomass or litter production. Instead, a structural equation model including base cations, soil clay content, and rainfall as exogenous factors and root biomass as an endogenous factor predicted nearly 50% of the variation in tropical soil C stocks, indicating a strong indirect effect of base cation availability on tropical soil C storage. Including soil base cations in C cycle models, and thus emphasizing mechanistic links among nutrients, root biomass, and soil C stocks, will improve prediction of climate-soil feedbacks in tropical forests. © 2017, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83195
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Geography, University of California, Los Angeles, 1255 Bunche Hall, Box 951524, Los Angeles, CA, United States; School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, United Kingdom; Department of Zoology, University of Oxford, South Parks Road, Oxford, United Kingdom; Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancon, Panama; Morton Arboretum, 4100 Illinois Rte. 53, Lisle, IL, United States; Field Museum of Natural History, 1400 S. Lake Shore Dr., Chicago, IL, United States
Recommended Citation:
Cusack D.F.,Markesteijn L.,Condit R.,et al. Soil carbon stocks across tropical forests of Panama regulated by base cation effects on fine roots[J]. Biogeochemistry,2018-01-01,137(2018-01-02)