Arid
DOI10.1111/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
ISSN0028-646X
EISSN1469-8137
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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