Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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 |
ISSN | 0032-079X |
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 |
推荐引用方式 GB/T 7714 | 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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