Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/nph.14693 |
Impacts of hydraulic redistribution on grass-tree competition vs facilitation in a semi-arid savanna | |
Barron-Gafford, Greg A.1,2,3; Sanchez-Canete, Enrique P.1,2,4; Minor, Rebecca L.1,2; Hendryx, Sean M.3; Lee, Esther5; Sutter, Leland F.1,3,6; Tran, Newton7; Parra, Elizabeth2; Colella, Tony1; Murphy, Patrick C.1; Hamerlynck, Erik P.8; Kumar, Praveen5; Scott, Russell L.6 | |
通讯作者 | Barron-Gafford, Greg A. |
来源期刊 | NEW PHYTOLOGIST
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ISSN | 0028-646X |
EISSN | 1469-8137 |
出版年 | 2017 |
卷号 | 215期号:4页码:1451-1461 |
英文摘要 | A long-standing ambition in ecosystem science has been to understand the relationship between ecosystem community composition, structure and function. Differential water use and hydraulic redistribution have been proposed as one mechanism that might allow for the coexistence of overstory woody plants and understory grasses. Here, we investigated how patterns of hydraulic redistribution influence overstory and understory ecophysiological function and how patterns vary across timescales of an individual precipitation event to an entire growing season. To this end, we linked measures of sap flux within lateral and tap roots, leaf-level photosynthesis, ecosystem-level carbon exchange and soil carbon dioxide efflux with local meteorology data. The hydraulic redistribution regime was characterized predominantly by hydraulic descent relative to hydraulic lift. We found only a competitive interaction between the overstory and understory, regardless of temporal time scale. Overstory trees used nearly all water lifted by the taproot to meet their own transpirational needs. Our work suggests that alleviating water stress is not the reason we find grasses growing in the understory of woody plants; rather, other stresses, such as excessive light and temperature, are being ameliorated. As such, both the two-layer model and stress gradient hypothesis need to be refined to account for this coexistence in drylands. |
英文关键词 | drylands hydraulic lift mesquite (Prosopis velutina) photosynthesis sap flow woody plant encroachment |
类型 | Article |
语种 | 英语 |
国家 | USA ; Spain ; Canada |
收录类别 | SCI-E |
WOS记录号 | WOS:000406876700017 |
WOS关键词 | WOODY-PLANT ENCROACHMENT ; GAS-EXCHANGE ; SOIL-WATER ; MOJAVE DESERT ; SAP FLOW ; SEASONAL PRECIPITATION ; ROOT SYSTEMS ; LEAF-LEVEL ; LIFT ; ECOSYSTEM |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/201252 |
作者单位 | 1.Univ Arizona, Sch Geog & Dev, Tucson, AZ 85721 USA; 2.Univ Arizona, Coll Sci, Biosphere 2, Tucson, AZ 85721 USA; 3.Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA; 4.Ctr Andaluz Medio Ambiente IISTA CEAMA, Granada 18006, Spain; 5.Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA; 6.USDA ARS, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA; 7.Univ Guelph, Sch Environm Sci, Guelph, ON N1G 2W1, Canada; 8.USDA ARS, Eastern Oregon Agr Res Ctr, Burns, OR 97720 USA |
推荐引用方式 GB/T 7714 | Barron-Gafford, Greg A.,Sanchez-Canete, Enrique P.,Minor, Rebecca L.,et al. Impacts of hydraulic redistribution on grass-tree competition vs facilitation in a semi-arid savanna[J]. University of Arizona,2017,215(4):1451-1461. |
APA | Barron-Gafford, Greg A..,Sanchez-Canete, Enrique P..,Minor, Rebecca L..,Hendryx, Sean M..,Lee, Esther.,...&Scott, Russell L..(2017).Impacts of hydraulic redistribution on grass-tree competition vs facilitation in a semi-arid savanna.NEW PHYTOLOGIST,215(4),1451-1461. |
MLA | Barron-Gafford, Greg A.,et al."Impacts of hydraulic redistribution on grass-tree competition vs facilitation in a semi-arid savanna".NEW PHYTOLOGIST 215.4(2017):1451-1461. |
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