Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.ecolmodel.2015.07.030 |
Reprint of "Effect of time scale on accounting for renewable emergy in ecosystems located in humid and arid climates" | |
Li, Linjun1; Lu, Hongfang2; Tilley, David R.3; Qiu, Guoyu1 | |
通讯作者 | Lu, Hongfang |
来源期刊 | ECOLOGICAL MODELLING
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ISSN | 0304-3800 |
EISSN | 1872-7026 |
出版年 | 2015 |
卷号 | 315页码:88-95 |
英文摘要 | Based on emergy accounting rules, only the greater number between emergy inputs from the same source, e.g., solar radiation and rainfall, should be accounted in emergy analysis to avoid double-counting. Using a year or a season as time scale, the rainfall emergy is usually larger than that of solar energy and thus taken as the renewable emergy input to the ecosystem. However, using a day as time scale, on sunny days with no rain only the solar energy would be counted as the renewable emergy. Therefore, different time scales may affect renewable emergy accounting. In this paper, we explored the effects of four time scales (year, season, month, and day) on renewable emergy accounting of forest ecosystems in Southeast China, a humid area, and the Minqin Oasis in Northwest China, an arid area. The results show that annual renewable emergy increased with the decrease of time scale but were close to each other in Southeast China (i.e., 2.5% difference at most), but were up to 30% different in arid Northwest China. However, the water which is actually used by forests for ecological productivity is evapotranspiration (ET), which can be less than precipitation in humid areas, but higher than rainfall in arid areas where groundwater compensates. Thus, it is ET rather than the available rainfall which should be counted as the renewable emergy input to ecological productivity. Otherwise the emergy contribution of renewable natural resources to ecosystems may be overestimated or underestimated, e.g., 0.33-7.33 times to the forests in Southeast China, and 0.36 times to the oasis system in Northwest China. Furthermore, despite whether or not it rains, ET emergy is often larger than solar emergy in most cases. Therefore, the use of ET emergy not only improves the estimate of emergy input, but also helps avoid the effect of time scale on renewable emergy accounting. (C) 2015 Published by Elsevier B.V. |
英文关键词 | Time scale Renewable emergy ET |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000363352200010 |
WOS关键词 | PRODUCTION SYSTEMS ; INTEGRATED EMERGY ; CHINA ; ENERGY ; RATIO ; TRANSFORMITY ; RESTORATION ; INFORMATION ; EVAPORATION ; MANAGEMENT |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | 北京大学 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/186815 |
作者单位 | 1.Peking Univ, Sch Environm & Energy, Key Lab Urban Habitat Environm Sci & Technol, Shenzhen 518055, Peoples R China; 2.Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China; 3.Univ Maryland, Dept Environm Sci & Technol, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Li, Linjun,Lu, Hongfang,Tilley, David R.,et al. Reprint of "Effect of time scale on accounting for renewable emergy in ecosystems located in humid and arid climates"[J]. 北京大学,2015,315:88-95. |
APA | Li, Linjun,Lu, Hongfang,Tilley, David R.,&Qiu, Guoyu.(2015).Reprint of "Effect of time scale on accounting for renewable emergy in ecosystems located in humid and arid climates".ECOLOGICAL MODELLING,315,88-95. |
MLA | Li, Linjun,et al."Reprint of "Effect of time scale on accounting for renewable emergy in ecosystems located in humid and arid climates"".ECOLOGICAL MODELLING 315(2015):88-95. |
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