Depressed hydraulic redistribution of roots more by stem refilling than by nocturnal transpiration for Populus euphratica Oliv. in situ measurement
文献类型：期刊论文
| 作者 | Yu, Tengfei1,2; Feng, Qi1,2; Si, Jianhua1,2; Mitchell, Patrick J.3; Forster, Michael A.4,5; Zhang, Xiaoyou1,2; Zhao, Chunyan1 |
| 刊名 | ECOLOGY AND EVOLUTION
 |
| 出版日期 | 2018-03-01 |
| 卷号 | 8期号:5页码:2607-2616 |
| ISSN号 | 2045-7758 |
| 关键词 | desert riparian trees hydraulic redistribution nocturnal transpiration sap flow stem refilling |
| DOI | 10.1002/ece3.3875 |
| 通讯作者 | Feng, Qi(qifeng@lzb.ac.cn) |
| 英文摘要 | During the night, plant water loss can occur either through the roots, as hydraulic redistribution (HR), or through the leaves via the stoma, as nocturnal transpiration (E-n), which was methodologically difficult to separate from stem refilling (R-e). While HR and E-n have been reported across a range of species, ecosystem, and climate zone, there is little understanding on the interactions between E-n and/or R-e and HR. As water movement at night occurs via gradients of water potential, it is expected that during periods of high atmospheric vapor pressure deficit (VPD), water loss via E-n will override water loss via HR. To test this hypothesis, sap flow in stems and roots of Populus euphratica Oliv. trees, growing in a riparian zone in a hyperarid climate, was measured once in a year. Nocturnal stem sap flow was separated into E-n and R-e using the forecasted refilling method. Substantial nocturnal sap flow (38% of 24-hr flux on average) was observed and positively correlated with VPD; however, the strength of the correlation was lower (R-2=.55) than diurnal sap flow (E-d) (R-2=.72), suggesting that nocturnal stem sap flow was attributed to both water loss through the canopy and replenishment of water in stem tissues. Partitioning of nocturnal sap flow shows that R-e constituted approximately 80%, and E-n similar to 20%, of nocturnal sap flow. The amount of root sap flow attributed to redistribution was negatively related to E-d (R-2=.69) and the amount of acropetally sap flow in stems, R-e (R-2=.41) and E-n (R-2=.14). It was suggested that the magnitude of HR is more strongly depressed by R-e that was recharge to the water loss via E-d than by E-n. It was consistent with whole-tree water balance theory, that the nighttime upward sap flow to xylem, stem refilling and transpiration, may depress hydraulic redistribution of roots. |
| 收录类别 | SCI |
| WOS关键词 | NIGHTTIME WATER-USE ; SAP FLOW ; STOMATAL CONDUCTANCE ; NORTHWEST CHINA ; SOIL-WATER ; STAND EVAPOTRANSPIRATION ; DESERT PHREATOPHYTE ; DIURNAL PATTERNS ; WOODY-PLANTS ; ARID REGION |
| WOS研究方向 | Environmental Sciences & Ecology ; Evolutionary Biology |
| WOS类目 | Ecology ; Evolutionary Biology |
| 语种 | 英语 |
| 出版者 | WILEY |
| WOS记录号 | WOS:000426725900020 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558124 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Feng, Qi |
| 作者单位 | 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Alxa Desert Ecohydrol Expt Res Stn, Lanzhou, Gansu, Peoples R China 2.Chinese Acad Sci, Key Lab Ecohydrol Inland River Basin, Lanzhou, Gansu, Peoples R China 3.CSIRO Land & Water, Hobart, Tas, Australia 4.Edaph Sci Pty Ltd, Port Macquarie, NSW, Australia 5.Univ Queensland, Sch Agr & Food Sci, Brisbane, Qld, Australia |
| 推荐引用方式 GB/T 7714 | Yu, Tengfei,Feng, Qi,Si, Jianhua,et al. Depressed hydraulic redistribution of roots more by stem refilling than by nocturnal transpiration for Populus euphratica Oliv. in situ measurement[J]. ECOLOGY AND EVOLUTION,2018,8(5):2607-2616. |
| APA | Yu, Tengfei.,Feng, Qi.,Si, Jianhua.,Mitchell, Patrick J..,Forster, Michael A..,...&Zhao, Chunyan.(2018).Depressed hydraulic redistribution of roots more by stem refilling than by nocturnal transpiration for Populus euphratica Oliv. in situ measurement.ECOLOGY AND EVOLUTION,8(5),2607-2616. |
| MLA | Yu, Tengfei,et al."Depressed hydraulic redistribution of roots more by stem refilling than by nocturnal transpiration for Populus euphratica Oliv. in situ measurement".ECOLOGY AND EVOLUTION 8.5(2018):2607-2616. |
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来源：寒区旱区环境与工程研究所
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