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High nitrate retention during winter in soils of the hubbard brook experimental forest. Ecosystems 10:217–225 (2007).
| Content Provider | CiteSeerX |
|---|---|
| Author | Judd, Kristin E. Likens, Gene E. Groffman, Peter M. |
| Abstract | Stream export of nitrogen (N) as nitrate (NO3); the most mobile form of N) from forest ecosystems is thought to be controlled largely by plant uptake of inorganic N, such that reduced demand for plant N during the non-growing season and following dis-turbances results in increased stream NO3) export. The roles of microbes and soils in ecosystem N retention are less clear, but are the dominant controls on N export when plant uptake is low. We used a mass balance approach to investigate soil N retention during winter (December through March) at the Hubbard Brook Experimental Forest by comparing NO3) inputs (atmospheric deposi-tion), internal production (soil microbial nitrifica-tion), and stream output. We focused on months when plant N uptake is nearly zero and the po-tential for N export is high. Although winter months accounted for only 10–15 % of annual net nitrification, soil NO3) production (0.8– 1.0 g N m)2 winter)1) was much greater than stream export (0.03–0.19 N m)2 winter)1). Soil NO3) retention in two consecutive winters was high (96 % of combined NO3) deposition and soil production; year 1) even following severe plant disturbance caused by an ice-storm (84%; year 2) We show that soil NO3) retention is surprisingly high even when N demand by plants is low. Our study highlights the need to better understand mechanisms of N retention during the non-grow-ing season to predict how ecosystems will respond to high inputs of atmospheric N, disturbance, and climate change. Key words: forest ecosystem; land-water inter-actions; mass balance; nitrification; nitrogen cycle; stream export. |
| File Format | |
| Publisher Date | 2007-01-01 |
| Access Restriction | Open |
| Subject Keyword | Hubbard Brook Experimental Forest Plant Uptake Soil No3 High Nitrate Retention Stream Export Dominant Control Soil Production Mass Balance Approach Winter Month Mobile Form Key Word Non-growing Season Consecutive Winter Mass Balance Soil Retention Climate Change Stream Output Ecosystem Retention Internal Production High Input Severe Plant Disturbance Dis-turbances Result Soil Microbial Nitrifica-tion Annual Net Nitrification Non-grow-ing Season Nitrogen Cycle Atmospheric Deposi-tion Understand Mechanism Increased Stream No3 Reduced Demand Land-water Inter-actions |
| Content Type | Text |
