Controls on ecosystem water-use and water-use efficiency: Insights from a comparison between grassland and riparian forest in the northern Great Plains
文献类型：期刊论文
| 作者 | Yang, Hao1,2; Rood, Stewart B.2; Flanagan, Lawrence B.2 |
| 刊名 | AGRICULTURAL AND FOREST METEOROLOGY
 |
| 出版日期 | 2019-06-15 |
| 卷号 | 271页码:22-32 |
| 关键词 | Eddy covariance Populus spp. Gross ecosystem photosynthesis Stomatal conductance Leaf area index Soil moisture |
| ISSN号 | 0168-1923 |
| DOI | 10.1016/j.agrformet.2019.02.034 |
| 通讯作者 | Flanagan, Lawrence B.(larry.flanagan@uleth.ca) |
| 英文摘要 | Within the grassland-dominated landscape of the North American Great Plains, riparian forest ecosystems exist along river floodplains. We compared cumulative evapotranspiration (ET) and ecosystem water-use efficiency (WUE) between a cottonwood forest and a nearby native grassland ecosystem in southern Alberta, using eddy covariance measurements during May-September (growing season) of three study years. Our objective was to test predictions about mechanistic controls on ecosystem water-use, and to provide insights into the amount of alluvial groundwater and stored soil water required to support a healthy riparian forest within the Great Plains biome. Grassland ET was dependent on precipitation inputs during the growing season. Cumulative growing season ET at the cottonwood site (375-451 mm) exceeded grassland ET (111-213 mm) by 2.1- to 3.4-fold depending on study year, despite slightly higher WUE in the cottonwood ecosystem. The difference in cumulative ET between ecosystems ranged from 238 to 264 mm in different years, in a region that normally receives 258 mm of cumulative precipitation during May-September. The large ET at the cottonwood site was caused by two-fold higher LAI, and associated greater canopy conductance than was apparent at the grassland site. The additional soil water required for the higher cottonwood ET was supplied by access to alluvial groundwater, which is recharged by river water, and was also supported by a larger soil volume to store water from precipitation and river flooding inputs. These factors resulted in a relatively long interval for cottonwood photosynthetic gas exchange that was consistent among years despite widely different environmental conditions, while the grassland had shorter growing season lengths that were constrained further as precipitation and soil moisture declined among years. Our analyses contribute to understanding the water requirements of these contrasting ecosystems and will help to improve management procedures for regulating river flow rates in order to sustain healthy riparian cottonwood ecosystems. |
| WOS关键词 | INTERANNUAL VARIATION ; ISOTOPE COMPOSITION ; EDDY COVARIANCE ; CARBON-DIOXIDE ; PLANT BIOMASS ; OLDMAN RIVER ; PRODUCTIVITY ; FLOWS ; CONDUCTANCE ; RESPONSES |
| 资助项目 | Alberta Innovates ; Natural Sciences and Engineering Council of Canada ; Conoco Phillips Canada ; State Scholarship Fund from the China Scholarship Council (CSC) |
| WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000468709200003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | Alberta Innovates ; Natural Sciences and Engineering Council of Canada ; Conoco Phillips Canada ; State Scholarship Fund from the China Scholarship Council (CSC) |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/59262]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Flanagan, Lawrence B. |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Univ Lethbridge, Dept Biol Sci, Water & Environm Sci Bldg,4401 Univ Dr, Lethbridge, AB T1K 3M4, Canada |
| 推荐引用方式 GB/T 7714 | Yang, Hao,Rood, Stewart B.,Flanagan, Lawrence B.. Controls on ecosystem water-use and water-use efficiency: Insights from a comparison between grassland and riparian forest in the northern Great Plains[J]. AGRICULTURAL AND FOREST METEOROLOGY,2019,271:22-32. |
| APA | Yang, Hao,Rood, Stewart B.,&Flanagan, Lawrence B..(2019).Controls on ecosystem water-use and water-use efficiency: Insights from a comparison between grassland and riparian forest in the northern Great Plains.AGRICULTURAL AND FOREST METEOROLOGY,271,22-32. |
| MLA | Yang, Hao,et al."Controls on ecosystem water-use and water-use efficiency: Insights from a comparison between grassland and riparian forest in the northern Great Plains".AGRICULTURAL AND FOREST METEOROLOGY 271(2019):22-32. |
入库方式： OAI收割
来源：地理科学与资源研究所
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