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Full-Text Articles in Physical Sciences and Mathematics
Effects Of Elevated Carbon Dioxide And Increased Temperature On Methane And Nitrous Oxide Fluxes: Evidence From Field Experiments, Feike A. Dijlstra, Stephen A. Prior, G. Brett Renion, H. Allen Torbert, Hanqin Tian, Chaoqun (Crystal) Lu, Rodney T. Venterea
Effects Of Elevated Carbon Dioxide And Increased Temperature On Methane And Nitrous Oxide Fluxes: Evidence From Field Experiments, Feike A. Dijlstra, Stephen A. Prior, G. Brett Renion, H. Allen Torbert, Hanqin Tian, Chaoqun (Crystal) Lu, Rodney T. Venterea
Chaoqun (Crystal) Lu
Climate change could alter terrestrial ecosystems, which are important sources and sinks of the potent green-house gases (GHGs) nitrous oxide (N2O) and methane (CH4), in ways that either stimulate or decrease the magnitude and duration of global warming. Using manipulative field experiments, we assessed how N2O and CH4 soil fluxes responded to a rise in atmospheric carbon dioxide (CO2) concentration and to increased air temperature. Nitrous oxide and CH4 responses varied greatly among studied ecosystems. Elevated CO2 often stimulated N2O emissions in fertilized systems and CH4 emissions in wetlands, peatlands, and rice paddy fields; both effects were stronger in clayey …
Century-Scale Responses Of Ecosystem Carbon Storage And Flux To Multiple Environmental Changes In The Southern United States, Hanqin Tian, Guangsheng Chen, Chi Zang, Mingliang Liu, Ge Sun, Arthur Chappelka, Wei Ren, Xiaofeng Xu, Chaoqun Lu, Shufen Pan, Hua Chen, Dafeng Hui, Steven Mcnulty, Graeme Lockaby, Eric Vance
Century-Scale Responses Of Ecosystem Carbon Storage And Flux To Multiple Environmental Changes In The Southern United States, Hanqin Tian, Guangsheng Chen, Chi Zang, Mingliang Liu, Ge Sun, Arthur Chappelka, Wei Ren, Xiaofeng Xu, Chaoqun Lu, Shufen Pan, Hua Chen, Dafeng Hui, Steven Mcnulty, Graeme Lockaby, Eric Vance
Chaoqun (Crystal) Lu
Terrestrial ecosystems in the southern United States (SUS) have experienced a complex set of changes in climate, atmospheric CO2 concentration, tropospheric ozone (O3), nitrogen (N) deposition, and land-use and land-cover change (LULCC) during the past century. Although each of these factors has received attention for its alterations on ecosystem carbon (C) dynamics, their combined effects and relative contributions are still not well understood. By using the Dynamic Land Ecosystem Model (DLEM) in combination with spatially explicit, long-term historical data series on multiple environmental factors, we examined the century-scale responses of ecosystem C storage and flux to multiple environmental changes in …
Multifactor Controls On Terrestrial N2o Flux Over North America From 1979 Through 2010, X. F. Xu, Hanqin Tian, G. S. Chen, M. L. Liu, Wei Ren, Chaoqun (Crystal) Lu, C. Zhang
Multifactor Controls On Terrestrial N2o Flux Over North America From 1979 Through 2010, X. F. Xu, Hanqin Tian, G. S. Chen, M. L. Liu, Wei Ren, Chaoqun (Crystal) Lu, C. Zhang
Chaoqun (Crystal) Lu
Nitrous oxide (N2O) is a potent greenhouse gas which also contributes to the depletion of stratospheric ozone (O3). However, the magnitude and underlying mechanisms for the spatiotemporal variations in the terrestrial sources of N2O are still far from certain. Using a process-based ecosystem model (DLEM – the Dynamic Land Ecosystem Model) driven by multiple global change factors, including climate variability, nitrogen (N) deposition, rising atmospheric carbon dioxide (CO2), tropospheric O3 pollution, N fertilizer application, and land conversion, this study examined the spatial and temporal variations in terrestrial N2O flux over North America and further attributed these variations to various driving …
In Situ Phytoplankton Analysis: There’S Plenty Of Room At The Bottom, Jeffrey S. Erickson, Nicole N. Hashemi, James M. Sullivan, Alan D. Weidemann, Frances S. Ligler
In Situ Phytoplankton Analysis: There’S Plenty Of Room At The Bottom, Jeffrey S. Erickson, Nicole N. Hashemi, James M. Sullivan, Alan D. Weidemann, Frances S. Ligler
Nastaran Hashemi
Approximately 70% of the earth is covered with water, within which the most dominant organism is phytoplankton. Not only is phytoplankton at the base of the marine food web, but it also fixes excess carbon dioxide and regulates sulfur on a global scale.1 Changes in phytoplankton populations have been linked to toxicity to humans and marine life, pollution, and global climate change.2 Routine monitoring of both fresh and salt water ecosystems has been taking place formany years, with consortia set up explicitly for this purpose. Consensus indicates that five categories of information are useful for early warning systems.3,4 These are …
Effect Of Nitrogen Deposition On China's Terrestrial Carbon Uptake In The Context Of Multifactor Environmental Changes, Chaoqun (Crystal) Lu, Hanqin Tian, Mingliang Liu, Wei Ren, Xiaofeng Xu, Guangsheng Chen, Chi Zhang
Effect Of Nitrogen Deposition On China's Terrestrial Carbon Uptake In The Context Of Multifactor Environmental Changes, Chaoqun (Crystal) Lu, Hanqin Tian, Mingliang Liu, Wei Ren, Xiaofeng Xu, Guangsheng Chen, Chi Zhang
Chaoqun (Crystal) Lu
The amount of atmospheric nitrogen (N) deposited on the land surface has increased globally and by nearly five times in China from 1901 to 2005. Little is known about how elevated reactive N input has affected the carbon (C) sequestration capability of China's terrestrial ecosystems, largely due to the lack of reliable data on N deposition. Here we have used a newly developed data set of historical N deposition at a spatial resolution of 10 km × 10 km in combination with other gridded historical information on climate, atmospheric composition, land use, and land management practices to drive a process-based …
Contemporary And Projected Biogenic Fluxes Of Methane And Nitrous Oxide In North American Terrestrial Ecosystems, Hanqin Tian, Chaoqun (Crystal) Lu, Guangsheng Chen, Bo Tao, Shufen Pan, Stephen J. Del Grosso, Xiaofeng Xu, Lori Bruhwiler, Steven C. Wofsy, Eric A. Kort, Stephen A. Prior
Contemporary And Projected Biogenic Fluxes Of Methane And Nitrous Oxide In North American Terrestrial Ecosystems, Hanqin Tian, Chaoqun (Crystal) Lu, Guangsheng Chen, Bo Tao, Shufen Pan, Stephen J. Del Grosso, Xiaofeng Xu, Lori Bruhwiler, Steven C. Wofsy, Eric A. Kort, Stephen A. Prior
Chaoqun (Crystal) Lu
Accurately estimating biogenic methane (CH4) and nitrous oxide (N2O) fluxes in terrestrial ecosystems is critical for resolving global budgets of these greenhouse gases (GHGs) and continuing to mitigate climate warming. Here, we assess contemporary biogenic CH4 and N2O budgets and probable climate-change-related impacts on CH4 and N2O emissions in terrestrial North America. Multi-approach estimations show that, during 1990–2010, biogenic CH4 emissions ranged from 0.159 to 0.502 petagrams of carbon dioxide (CO2) equivalents per year (Pg CO2eq yr–1, where 1 Pg = 1 × 1015 g) and N2O emissions ranged from 0.802 to 1.016 Pg CO2eq yr–1, which offset 47–166% of …