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中美研究称CO2浓度升高使全球森林碳汇每年增加2.8亿吨 快报文章
气候变化快报,2024年第9期
作者:  董利苹
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:464/0  |  提交时间:2024/05/05
CO2 Levels  Global Forests  Carbon and Nitrogen Cycling  
研究揭示火灾对森林生态系统土壤碳循环库的影响 快报文章
气候变化快报,2023年第13期
作者:  裴惠娟
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Fire  Forest  Soil  Carbon Cycling  Meta-analysis  
受温度与土壤侵蚀影响全球土壤碳汇增长7% 快报文章
资源环境快报,2023年第3期
作者:  董利苹
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Temperature  Erosion-induced Disturbances  Soil Organic Carbon Cycling  
Ice retreat in Wilkes Basin of East Antarctica during a warm interglacial 期刊论文
NATURE, 2020, 583 (7817) : 554-+
作者:  T. Blackburn;  G. H. Edwards;  S. Tulaczyk;  M. Scudder;  G. Piccione;  B. Hallet;  N. McLean;  J. C. Zachos;  B. Cheney;  J. T. Babbe
收藏  |  浏览/下载:21/0  |  提交时间:2020/08/09

Uranium isotopes in subglacial precipitates from the Wilkes Basin of the East Antarctic Ice Sheet reveal ice retreat during a warm Pleistocene interglacial period about 400,000 years ago.


Efforts to improve sea level forecasting on a warming planet have focused on determining the temperature, sea level and extent of polar ice sheets during Earth'  s past interglacial warm periods(1-3). About 400,000 years ago, during the interglacial period known as Marine Isotopic Stage 11 (MIS11), the global temperature was 1 to 2 degrees Celsius greater(2)and sea level was 6 to 13 metres higher(1,3). Sea level estimates in excess of about 10 metres, however, have been discounted because these require a contribution from the East Antarctic Ice Sheet(3), which has been argued to have remained stable for millions of years before and includes MIS11(4,5). Here we show how the evolution of(234)U enrichment within the subglacial waters of East Antarctica recorded the ice sheet'  s response to MIS11 warming. Within the Wilkes Basin, subglacial chemical precipitates of opal and calcite record accumulation of(234)U (the product of rock-water contact within an isolated subglacial reservoir) up to 20 times higher than that found in marine waters. The timescales of(234)U enrichment place the inception of this reservoir at MIS11. Informed by the(234)U cycling observed in the Laurentide Ice Sheet, where(234)U accumulated during periods of ice stability(6)and was flushed to global oceans in response to deglaciation(7), we interpret our East Antarctic dataset to represent ice loss within the Wilkes Basin at MIS11. The(234)U accumulation within the Wilkes Basin is also observed in the McMurdo Dry Valleys brines(8-10), indicating(11)that the brine originated beneath the adjacent East Antarctic Ice Sheet. The marine origin of brine salts(10)and bacteria(12)implies that MIS11 ice loss was coupled with marine flooding. Collectively, these data indicate that during one of the warmest Pleistocene interglacials, the ice sheet margin at the Wilkes Basin retreated to near the precipitate location, about 700 kilometres inland from the current position of the ice margin, which-assuming current ice volumes-would have contributed about 3 to 4 metres(13)to global sea levels.


  
Upper Midwest lakes are supersaturated with N-2 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (29) : 17063-17067
作者:  Loeks-Johnson, Brianna M.;  Cotner, James B.
收藏  |  浏览/下载:21/0  |  提交时间:2020/07/09
denitrification  nitrogen fixation  nitrogen cycling  biogeochemistry  
Constraining the Age and Evolution of the Tuaheni Landslide Complex, Hikurangi Margin, New Zealand, Using Pore-Water Geochemistry and Numerical Modeling 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Luo, Min;  Torres, Marta E.;  Kasten, Sabine;  Mountjoy, Joshu J.
收藏  |  浏览/下载:15/0  |  提交时间:2020/05/13
Tuaheni Landslide Complex  pore water  transient state  age constraint  Hikurangi Margin  methane cycling  
The stoichiometry of soil microbial biomass determines metabolic quotient of nitrogen mineralization 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (3)
作者:  Li, Zhaolei;  Zeng, Zhaoqi;  Tian, Dashuan;  Wang, Jinsong;  Fu, Zheng;  Wang, Bingxue;  Tang, Ze;  Chen, Weinan;  Chen, Han Y. H.;  Wang, Changhui;  Yi, Chuixiang;  Niu, Shuli
收藏  |  浏览/下载:23/0  |  提交时间:2020/07/02
dominant driver  global warming  metabolic quotient  natural ecosystems  nitrogen cycling  stoichiometry of microbial biomass  
Dynamics of soil nitrogen cycling and losses under Norway spruce logging residues on a clear-cut 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 449
作者:  Smolander, Aino;  Tormanen, Tiina;  Kitunen, Veikko;  Lindroos, Antti-Jussi
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Forest soil  Logging residues  N cycling  N losses  Norway spruce  Percolation water  
The influence of green streets on cycling behavior in European cities 期刊论文
LANDSCAPE AND URBAN PLANNING, 2019, 190
作者:  Nawrath, Maximilian;  Kowarik, Ingo;  Fischer, Leonie K.
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Green cycling routes  Physical activity  Preference  Urban green infrastructure  Urban greenways  Vegetated streets  
ENSO and NAO affect long-term leaf litter dynamics and stoichiometry of Scots pine and European beech mixedwoods 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (9) : 3070-3090
作者:  Gonzalez de Andres, Ester;  Blanco, Juan A.;  Bosco Imbert, J.;  Guan, Biing T.;  Lo, Yueh-Hsin;  Castillo, Federico J.
收藏  |  浏览/下载:17/0  |  提交时间:2019/11/27
ensemble empirical mode decomposition (EEMD)  Fagus sylvatica  leaf litter  nutrient cycling  nutrient limitation  Pinus sylvestris  Pyrenees  stoichiometry  structural equation model (SEM)