Arid
DOI10.1007/s11104-008-9567-7
Does hydraulic lift or nighttime transpiration facilitate nitrogen acquisition?
Snyder, Keirith A.1; James, Jeremy J.2; Richards, James H.3; Donovan, Lisa A.4
通讯作者Snyder, Keirith A.
会议名称Zinc Crops 2007 Conference
会议日期MAY 24-26, 2007
会议地点Istanbul, TURKEY
英文摘要

Water movement from roots to soil at night in the process of hydraulic lift (redistribution) rehydrates the rhizosphere and has been proposed to improve plant nutrient acquisition. Another process that has now been found in many plant species is nighttime transpiration and this could also affect nutrient relations by influencing supply of mobile nutrients to roots at night. The effects of these soil/root water relations interactions have not been adequately tested. We chose ten Sarcobatus vermiculatus (Hook.) Torrey shrubs with different magnitudes of hydraulic lift (i.e. diel range in soil water potential) to test the hypothesis that the magnitude of lift would be positively related to the amount of nitrogen (N) uptake over a period of days. A N-15 tracer was injected in the 20-30 cm soil layer at locations with hydraulic lift to determine plant N-15 acquisition by shallow roots conducting hydraulic lift. Half of the plants were also placed in large humidified tents (i.e. "bagged"), which suppressed nighttime transpiration, and thus were expected to have greater magnitudes of hydraulic lift, although they did not. All plants took up the N-15 tracer, but contrary to our hypothesis the magnitude of hydraulic lift had no significant effect on the amount of N-15 acquired over a 9-day period following labeling. However, plants that were bagged tended to have lower N-15 acquisition (P=0.07). These data indicate that decreased nighttime transpirational water loss or some other effect of bagging may decrease nutrient acquisition by these nutrient-limited phreatophytic shrubs and more generally suggests a possible nutritional benefit of nighttime transpiration by plants. This suggestion needs more thorough testing to elucidate an important potential link between plant water and nutrient relations.


英文关键词desert shrubs hydraulic lift hydraulic redistribution nighttime transpiration nitrogen acquisition nitrogen isotopes sarcobatus vermiculatus
来源出版物PLANT AND SOIL
ISSN0032-079X
出版年2008
卷号306
期号1-2
页码159-166
出版者SPRINGER
类型Article;Proceedings Paper
语种英语
国家USA
收录类别CPCI-S ; SCI-E
WOS记录号WOS:000254849800017
WOS关键词ROOT XYLEM EMBOLISM ; SOIL-WATER ; PRECIPITATION PULSES ; PREDAWN PLANT ; REDISTRIBUTION ; GROWTH ; CONDUCTANCE ; ECOSYSTEMS ; TRANSPORT ; PATTERNS
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/297297
作者单位1.USDA ARS, Exot & Invas Weeds Res Unit, Reno, NV 89512 USA;
2.USDA ARS, Burns, OR 97720 USA;
3.Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA;
4.Univ Georgia, Dept Plant Biol, Athens, GA 30602 USA
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Snyder, Keirith A.,James, Jeremy J.,Richards, James H.,et al. Does hydraulic lift or nighttime transpiration facilitate nitrogen acquisition?[C]:SPRINGER,2008:159-166.
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