Seasonality of soil moisture mediates responses of ecosystem phenology to elevated CO2 and warming in a semiarid grassland
نویسندگان
چکیده
Tamara J. Zelikova*, David G. Williams, Rhonda Hoenigman, Dana M. Blumenthal, Jack A. Morgan and Elise Pendall Department of Botany, University of Wyoming, Laramie, WY 82071, USA; Department of Computer Science, University of Colorado, Boulder, CO 80309, USA; Rangeland Resources Research Unit, USDA-ARS, 1701 Centre Avenue, Fort Collins, CO 80526, USA; and Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, NSW 2751, Australia
منابع مشابه
Elevated CO2 and warming effects on CH4 uptake in a semiarid grassland below optimum soil moisture
[1] Semiarid rangelands are a significant global sink for methane (CH4), but this sink strength may be altered by climate change. Methane uptake is sensitive to soil moisture showing a hump‐shaped relationship with a distinct optimum soil moisture level. Both CO2 and temperature affect soil moisture, but the direction of CH4 uptake response may depend on if the system is below or above the soil...
متن کاملWarming Reduces Carbon Losses from Grassland Exposed to Elevated Atmospheric Carbon Dioxide
The flux of carbon dioxide (CO2) between terrestrial ecosystems and the atmosphere may ameliorate or exacerbate climate change, depending on the relative responses of ecosystem photosynthesis and respiration to warming temperatures, rising atmospheric CO2, and altered precipitation. The combined effect of these global change factors is especially uncertain because of their potential for interac...
متن کاملClimate change reduces the net sink of CH4 and N2O in a semiarid grassland.
Atmospheric concentrations of methane (CH4 ) and nitrous oxide (N2 O) have increased over the last 150 years because of human activity. Soils are important sources and sinks of both potent greenhouse gases where their production and consumption are largely regulated by biological processes. Climate change could alter these processes thereby affecting both rate and direction of their exchange wi...
متن کاملDaily and seasonal changes in soil amino acid composition in a semiarid grassland exposed to elevated CO2 and warming
Soil amino acids are often an important source of nitrogen (N) for plants, and anticipated global changes, including climate warming and rising atmospheric CO2 levels, have the potential to alter plant and microbial production and consumption of this N source in soils. We determined soil amino acid composition over a 1-year period at diurnal and seasonal time scales in a multi-factor global cha...
متن کاملProjected ecosystem impact of the Prairie Heating and CO2 Enrichment experiment.
The Prairie Heating and CO2 Enrichment (PHACE) experiment has been initiated at a site in southern Wyoming (USA) to simulate the impact of warming and elevated atmospheric CO2 on ecosystem dynamics for semiarid grassland ecosystems. The DAYCENT ecosystem model was parametrized to simulate the impact of elevated CO2 at the open-top chamber (OTC) experiment in north-eastern Colorado (1996-2001), ...
متن کامل