DOI: 10.1111/gcb.13244
论文题名: Variations in soil carbon sequestration and their determinants along a precipitation gradient in seasonally dry tropical forest ecosystems
作者: Campo J. ; Merino A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 5 起始页码: 1942
结束页码: 1956
语种: 英语
英文关键词: Charcoal
; Drought
; Episodic events
; Organic matter composition and thermal stability
; Plant-climate-soil interactions
; Yucatan Peninsula
Scopus关键词: carbon sequestration
; charcoal
; drought
; episodic event
; forest ecosystem
; precipitation (climatology)
; soil carbon
; soil organic matter
; tropical forest
; Yucatan Peninsula
; carbon
; rain
; soil
; carbon sequestration
; chemistry
; climate change
; drought
; forest
; Mexico
; season
; soil
; tropic climate
; Carbon
; Carbon Sequestration
; Climate Change
; Droughts
; Forests
; Mexico
; Rain
; Seasons
; Soil
; Tropical Climate
英文摘要: The effect of precipitation regime on the C cycle of tropical forests is poorly understood, despite the existence of models that suggest a drier climate may substantially alter the source-sink function of these ecosystems. Along a precipitation regime gradient containing 12 mature seasonally dry tropical forests growing under otherwise similar conditions (similar annual temperature, rainfall seasonality, and geological substrate), we analyzed the influence of variation in annual precipitation (1240 to 642 mm) and duration of seasonal drought on soil C. We investigated litterfall, decomposition in the forest floor, and C storage in the mineral soil, and analyzed the dependence of these processes and pools on precipitation. Litterfall decreased slightly - about 10% - from stands with 1240 mm yr-1 to those with 642 mm yr-1, while the decomposition decreased by 56%. Reduced precipitation strongly affected C storage and basal respiration in the mineral soil. Higher soil C storage at the drier sites was also related to the higher chemical recalcitrance of litter (fine roots and forest floor) and the presence of charcoal across sites, suggesting an important indirect influence of climate on C sequestration. Basal respiration was controlled by the amount of recalcitrant organic matter in the mineral soil. We conclude that in these forest ecosystems, the long-term consequences of decreased precipitation would be an increase in organic layer and mineral soil C storage, mainly due to lower decomposition and higher chemical recalcitrance of organic matter, resulting from changes in litter composition and, likely also, wildfire patterns. This could turn these seasonally dry tropical forests into significant soil C sinks under the predicted longer drought periods if primary productivity is maintained. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61420
Appears in Collections: 影响、适应和脆弱性
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作者单位: Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico; Escuela Politécnica Superior, Soil Science and Agricultural Chemistry University of Santiago de Compostela, Lugo, Spain
Recommended Citation:
Campo J.,Merino A.. Variations in soil carbon sequestration and their determinants along a precipitation gradient in seasonally dry tropical forest ecosystems[J]. Global Change Biology,2016-01-01,22(5)