In temperate zones, microbial activity is coupled to variations in temperature, yet at the ecosystem level, microbial N mineralization seems to play a minor role in determining patterns of N loss.
(1896-1977)International Related to Geologic TimeGeomagnetism We analyzed long-term (21–32 years) time series of climate and stream and atmospheric chemistry from two temperate deciduous forest watersheds in the southeastern USA to understand the sensitivity of internal forest N cycles to climate variation and atmospheric deposition.
Extrapolation of current trends in temperature and N deposition suggests that the upturn in temperature may increase future N export by greater than threefold more than from increasing deposition, revealing a potential direct effect of anthropogenic warming on terrestrial N cycles.In an ongoing effort to be fiscally responsible, the Southern Research Station (SRS) will no longer produce and distribute hard copies of our publications. Many SRS publications are available at cost via the The Southern Research Station is one of seven units that make up the U.S. Forest Service Research and Development organization – the most extensive natural resources research organization in the world. Through maximum likelihood analysis, we derive biologically realistic estimates of N mineralization and its temperature sensitivity (Q10).We find that seasonality and long-term trends in stream nitrate (NO3) concentrations can in large part be explained by the dynamics of internal biological cycling responding to climate rather than external forcing from atmospheric chemistry.
Global Change Biology 1-12. and Chemical OceanographySolar
It occurs in Eastern North America and Northeastern Asia. A temperate forest corresponds to the forest concentration formed in the northern and southern hemisphere.
Modeled estimates represent means of output for the last 5 years modeled and were generated using PnET‐CN with full on‐site parameterization including its original N balance subroutine (CN), and using PnET‐CNMeasured (solid) and modeled (striped) estimates of % N in woody litter in a 100‐year‐old watershed in the Fernow Experimental Forest (Parsons, West Virginia). Blog.
At the core of the new paradigm is the concept of nitrogen saturationof forest ecosystems. The bacteria converts nitrogen into ammonia for plants. Abstract. Rather, N losses often appear to vary with seasonality in hydrology and plant demand, while exports over longer periods are thought to be associated with increasing rates of anthropogenic N deposition. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. U.S. Forest Service