Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/656508 |
| 报告编号 | DOE/ER/62126--T1-Pt.2 |
| 来源ID | OSTI_ID: 656508 |
| Plant nitrogen budget under elevated carbon dioxide level: Regulation by nitrogen absorption and assimilation. Progress report, October 1, 1995--July 31, 1996 | |
| BassiriRad, H.; Gutschick, V. | |
| 英文摘要 | The overall objective is to assess root physiological and morphological characteristics that may alter plant N acquisition capacity in response to rising atmospheric CO{sub 2} concentration. There is increasing evidence that plant and ecosystem responses to elevated levels of CO{sub 2} will ultimately depend on availability and acquisition rate of other resources such as N. Therefore, knowledge of any changes in root capacity to acquire N is crucial in predicting plant and ecosystem responses to high CO{sub 2}. Here the authors are testing two major hypotheses: (1) elevated CO{sub 2} will enhance root N uptake kinetics and (2) CO{sub 2} enrichment will increase root preference for NO{sub 3}{sup {minus}} as opposed to NH{sub 4}{sup +}. High CO{sub 2} enhances root energy status which should in turn favor energy-intensive processes such as NO{sub 3}{sup {minus}} uptake and assimilation. The above hypotheses are being tested on a range of species from native and agricultural ecosystems using a combination of field, lab and growth chamber studies. The authors have demonstrated a considerable interspecies variation in root N uptake responses to CO{sub 2} enrichment and attempts are now underway to evaluate if such variations are correlated with different functional groups. A comprehensive growth model, using physiological and allocation parameters, has been largely completed and will be used to analyze the completed experimental data. |
| 出版年 | 1998 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 54 ENVIRONMENTAL SCIENCES ; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES ; PROGRESS REPORT ; BIOLOGICAL EFFECTS ; CARBON DIOXIDE ; ECOLOGICAL CONCENTRATION ; NITRATES ; PLANT GROWTH ; ROOTS ; EXPERIMENTAL DATA ; MATHEMATICAL MODELS |
| URL | http://www.osti.gov/scitech/servlets/purl/656508 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/267609 |
| 推荐引用方式 GB/T 7714 | BassiriRad, H.,Gutschick, V.. Plant nitrogen budget under elevated carbon dioxide level: Regulation by nitrogen absorption and assimilation. Progress report, October 1, 1995--July 31, 1996,1998. |
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