Responses of net ecosystem CO2 exchange to nitrogen fertilization in experimentally manipulated grassland ecosystems
文献类型：期刊论文
| 作者 | Cheng, Xiaoli1,5; Luo, Yiqi1; Su, Bo1; Verburg, Paul S. J.2; Hui, Dafeng6; Obrist, Daniel2; Arnone, John A., III2; Johnson, Dale W.3; Evans, R. David4 |
| 刊名 | AGRICULTURAL AND FOREST METEOROLOGY
 |
| 出版日期 | 2009-11-03 |
| 卷号 | 149期号:11页码:1956-1963 |
| ISSN号 | 0168-1923 |
| 关键词 | Net ecosystem CO2 exchange Nitrogen fertilization Radiation-use efficiency Cheatgrass (Bromus tectorum L.) Grassland ecosystem |
| DOI | 10.1016/j.agrformet.2009.07.001 |
| 英文摘要 | Nitrogen (N) addition enhances primary productivity of terrestrial ecosystems. However, the effects of N fertilization and/or deposition on net ecosystem CO2 exchange (NEE) are not fully understood. The effects of N on NEE were investigated in two experimental cheatgrass ecosystems in Ecologically Controlled Enclosed Lysimeter Laboratories (EcoCELLs), Reno, Nevada. In this experiment, no N fertilization was added to the two EcoCELLs in the first year and two different N fertilization regimes were applied in the second year. N fertilizer was applied once to one EcoCELL (pulse fertilization, PF). and the same total amount of N in biweekly increments to the other EcoCell (gradual fertilization, GF). NEE, photosynthetically active radiation (PAR) and canopy green leaf area index (LAI) were continuously measured in the two EcoCELLs during the pretreatment and N-fertilized years. Plant N content and biomass were measured at the end of the growing season in each year. Radiation-use efficiency (RUFCO2) was calculated as the ratio of gross ecosystem photosynthesis (GEP) to the intercepted photosynthetically active radiation (IPAR). The responses of NEE to IPAR were used to estimate the maximum ecosystem photosynthetic capacity (F-max). N fertilization stimulated canopy LAI, plant N content, F-max, RUECO2, NEE and biomass in both methods of N supply applications. PF led to higher LAI, F-max and NEE than GF, but both had a similar RUECO2 during the early growing season. GF maintained higher LAI, F-max, RUECO2 and NEE than PF during the late growing season. At the ecosystem level, N fertilization stimulated daily NEE directly by increasing canopy LAI, plant N content, shoot/root ratio and the maximum ecosystem photosynthetic capacity, and increased the seasonally accumulated NEE indirectly by extending the growing season. PF differed significantly from GF in its effects on NEE and RUECO2, possibly due to differential rates and timing of N availability. Our study suggested that these changes in the canopy RUECO2 and growing season under N fertilization or N deposition regimes should be considered in modeling studies of ecosystem C sequestration. (C) 2009 Elsevier B.V. All rights reserved. |
| 资助项目 | Andrew Mellon Foundation ; Office of Science (BER), U.S. Department of Energy[DE-FG03-99ER62800] |
| WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000270640300016 |
| 源URL | [http://202.127.146.157/handle/2RYDP1HH/1009]  |
| 专题 | 中国科学院武汉植物园 |
| 通讯作者 | Cheng, Xiaoli |
| 作者单位 | 1.Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA 2.Univ Nevada, Desert Res Inst, Reno, NV 89512 USA 3.Univ Nevada, Dept Environm & Resource Sci, Reno, NV 89512 USA 4.Washington State Univ, Sch Biol Sci, Pullman, WA 99164 USA 5.Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Peoples R China 6.Tennessee State Univ, Dept Biol Sci, Nashville, TN 37209 USA |
| 推荐引用方式 GB/T 7714 | Cheng, Xiaoli,Luo, Yiqi,Su, Bo,et al. Responses of net ecosystem CO2 exchange to nitrogen fertilization in experimentally manipulated grassland ecosystems[J]. AGRICULTURAL AND FOREST METEOROLOGY,2009,149(11):1956-1963. |
| APA | Cheng, Xiaoli.,Luo, Yiqi.,Su, Bo.,Verburg, Paul S. J..,Hui, Dafeng.,...&Evans, R. David.(2009).Responses of net ecosystem CO2 exchange to nitrogen fertilization in experimentally manipulated grassland ecosystems.AGRICULTURAL AND FOREST METEOROLOGY,149(11),1956-1963. |
| MLA | Cheng, Xiaoli,et al."Responses of net ecosystem CO2 exchange to nitrogen fertilization in experimentally manipulated grassland ecosystems".AGRICULTURAL AND FOREST METEOROLOGY 149.11(2009):1956-1963. |
入库方式： OAI收割
来源：武汉植物园
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