DOI: 10.1007/s10533-018-0422-5
Scopus记录号: 2-s2.0-85040698458
论文题名: Growing season warming and winter freeze–thaw cycles reduce root nitrogen uptake capacity and increase soil solution nitrogen in a northern forest ecosystem
作者: Sanders-DeMott R. ; Sorensen P.O. ; Reinmann A.B. ; Templer P.H.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 3 起始页码: 337
结束页码: 349
语种: 英语
英文关键词: Climate change
; Hubbard Brook Experimental Forest
; Nitrogen cycling
; Root damage
; Snow removal
; Soil freezing
; Soil warming
Scopus关键词: climate change
; forest ecosystem
; freeze-thaw cycle
; freezing
; global warming
; growing season
; nitrogen
; nutrient availability
; nutrient uptake
; root
; snow
; soil nitrogen
; warming
; winter
; Hubbard Brook Experimental Forest
; New Hampshire
; United States
英文摘要: Northern forest ecosystems are projected to experience warmer growing seasons and increased soil freeze–thaw cycles in winter over the next century. Past studies show that warmer soils in the growing season enhance nitrogen uptake by plants, while soil freezing in winter reduces plant uptake and ecosystem retention of nitrogen, yet the combined effects of these changes on plant root capacity to take up nitrogen are unknown. We conducted a 2-year (2014–2015) experiment at Hubbard Brook Experimental Forest in New Hampshire, USA to characterize the response of root damage, nitrogen uptake capacity, and soil solution nitrogen to growing season warming combined with soil freeze–thaw cycles in winter. Winter freeze–thaw cycles damaged roots, reduced nitrogen uptake capacity by 42%, and increased soil solution ammonium in the early growing season (May–June). During the peak growing season (July), root nitrogen uptake capacity was reduced 40% by warming alone and 49% by warming combined with freeze–thaw cycles. These results indicate the projected combination of colder soils in winter and warmer soils in the snow-free season will alter root function by reducing root nitrogen uptake capacity and lead to transient increases of nitrogen in soil solution during the early growing season, with the potential to alter root competition for soil nitrogen and seasonal patterns of soil nitrogen availability. We conclude that considering interactive effects of changes in climate during winter and the snow-free season is essential for accurate determination of the response of nitrogen cycling in the northern hardwood forest to climate change. © 2018, 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/83179
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 Biology, Boston University, 5 Cummington Mall, Boston, MA, United States; Environmental Sciences Initiative, Advanced Science Research Center at the Graduate Center of the City University of New York, 85 Saint Nicholas Terrace, New York, NY, United States; Department of Geography, Hunter College, 695 Park Ave, New York, NY, United States
Recommended Citation:
Sanders-DeMott R.,Sorensen P.O.,Reinmann A.B.,et al. Growing season warming and winter freeze–thaw cycles reduce root nitrogen uptake capacity and increase soil solution nitrogen in a northern forest ecosystem[J]. Biogeochemistry,2018-01-01,137(3)