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| DOI | 10.2172/762876 |
| 来源ID | OSTI_ID: 762876 |
| Simulated effects of elevated CO{sub 2} on nitrogen cycling using the NuCM model | |
| D.W. Johnson | |
| 英文摘要 | The interactions between elevated CO{sub 2} and N cycling were explored using simulations generated by the Nutrient Cycling Model (NuCM) for a Pinus taeda site at Duke, North Carolina and a mixed deciduous site at Walker Branch, Tennessee. The simulations tested whether N limitation would prevent growth increase in response to elevated CO{sub 2} and whether growth response to CO{sub 2} in N-limited systems could be facilitated by increased biomass/N (reduced concentration) and/or increased litter N mineralization. Nitrogen limitation precluded additional growth when target growth rates and litterfall were increased (simulating potential response to elevated CO{sub 2}) at the Duke site. At the Walker Branch site, increasing target growth and litterfall caused a slight (790) increases in growth. Reducing foliar N concentrations caused reduced growth because of N limitation created by reduced litter quality (C/N ratio), reduced decomposition and N accumulation in forest floor. These effects were most pronounced at the Duke site, where the forest floor N turnover rate was lower than at the Walker Branch site. Reducing wood N concentration allowed prolonged increases in growth because of greater biomass/N; however, N uptake was reduced, allowing greater N immobilization in the forest floor and soil. Increased N mineralization caused increased growth at the Duke site but not at Walker Branch. |
| 出版年 | 1998 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 09 BIOMASS FUELS ; 54 ENVIRONMENTAL SCIENCES ; FORESTS ; MINERALIZATION ; NITROGEN ; NORTH CAROLINA ; NUTRIENTS ; TARGETS ; TENNESSEE ; WOOD ; CARBON DIOXIDE |
| URL | http://www.osti.gov/scitech/servlets/purl/762876 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/267658 |
| 推荐引用方式 GB/T 7714 | D.W. Johnson. Simulated effects of elevated CO{sub 2} on nitrogen cycling using the NuCM model,1998. |
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