globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2016.08.049
Scopus记录号: 2-s2.0-84985987222
论文题名:
Growth and water use of Populus euphratica trees and stands with different water supply along the Tarim River, NW China
作者: Lang P.; Ahlborn J.; Schäfer P.; Wommelsdorf T.; Jeschke M.; Zhang X.; Thomas F.M.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2016
卷: 380
起始页码: 139
结束页码: 148
语种: 英语
英文关键词: Ground water ; Phreatophyte ; Sap flow measurement ; Stand transpiration ; Stem diameter increment ; Water conveyance
Scopus关键词: Forestry ; Groundwater ; Groundwater resources ; Irrigation ; Reforestation ; Reservoirs (water) ; Rivers ; Transpiration ; Water supply ; Agricultural irrigation ; Basal area increment ; Ground water depths ; Interannual fluctuations ; Phreatophyte ; Sap flow measurements ; Stem diameter ; Water conveyance ; Water resources ; basal area ; deciduous tree ; sap flow ; transpiration ; water availability ; water supply ; water table ; water use ; xylem ; China ; Taklimakan Desert ; Tarim River ; Xinjiang Uygur ; Populus ; Populus euphratica
英文摘要: The phreatophytic tree species Populus euphratica Oliv. (Euphrates poplar) forms riparian (tugai) forests along the Tarim River at the northern and eastern fringe of the hyper-arid Taklamakan Desert (Xinjiang province, NW China). These forests are threatened by decreasing groundwater levels due to excessive withdrawal of water for agricultural irrigation. At three plots each at the middle (Yingbazar) and the lower reaches (Arghan) of the Tarim River, we investigated the long-term effects of different water supply due to different distances to the groundwater (from 2 to 12 m) or to additional supply with water from reservoirs, which is being conveyed to the Tarim River's lower reaches since 2000 to conserve and restore the poplar forests. We conducted tree-ring analyses for the time period 1946–2011 and quantified the water use at the tree (Etree) and the stand level (Estand) using the Granier method. For the last four decades of investigation, the average tree-ring width and basal area increment (BAI), the cumulative Etree (May–August) and Estand were significantly higher on the plots with the largest water supply than on the plots with the largest distance to the groundwater. However, the maximum values of xylem sap flow density and Etree values averaged for the vegetation period did not differ significantly among plots and between sites. These transpiration values and the relatively large BAI even at a large distance to the groundwater indicate that—in contrast to previous studies—Euphrates poplars can grow vigorously even at a groundwater depth of up to 12 m. Supply with additional water resulted in a marked increase in BAI. Lower Estand at lower water supply can be explained with a sparser stand density. Interannual fluctuations in the water supply resulted in distinct alterations in BAI in trees that grow at a short distance to the water table or are supplied with additional water. Against the background of limited water availability in the region, we recommend concentrating the conveyance of additional water to forest stands with a short distance to groundwater to keep those forests fully functional and to maintain their ability to regenerate. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64706
Appears in Collections:影响、适应和脆弱性

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作者单位: University of Trier, Faculty of Regional and Environmental Sciences, Geobotany, Campus II, Behringstraße 21, Trier, Germany; Chinese Academy of Sciences, Xinjiang Institute of Ecology and Geography, 40 South Beijing Road, Urumqi, China; University of Lüneburg, Center for Methods, Rotenbleicher Weg 67, RW.208, Lüneburg, Germany

Recommended Citation:
Lang P.,Ahlborn J.,Schäfer P.,et al. Growth and water use of Populus euphratica trees and stands with different water supply along the Tarim River, NW China[J]. Forest Ecology and Management,2016-01-01,380
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