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您的检索式：作者名="Samuel Barrels"
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| 1 | Water Supply Changes N and P Conservation in a Perennial Grass Leymus chinensis显示文摘Changes in precipitation can influence soil water and nutrient availability,and thus affect plant nutrient conservation strategies. Better understanding of how nutrient conservation changes with variations in water availability is crucial for predicting the potential influence of global climate change on plant nutrient-use strategy. Here,green-leaf nitrogen (N) and phosphorus (P) concentrations,N-and P-resorption proficiency (the terminal N and P concentration in senescent leaves,NRP and PRP,respectively),and N-and P-resorption efficiency (the proportional N and P withdrawn from senescent leaves prior to abscission,NRE and PRE,respectively) of Leymus chinensis (Trin.) Tzvel.,a typical perennial grass species in northern China,were examined along a water supply gradient to explore how plant nutrient conservation responds to water change. Increasing water supply at low levels (< 9000 mL/year) increased NRP,PRP and PRE,but decreased green-leaf N concentration. It did not significantly affect green-leaf P concentration or NRE. By contrast,all N and P conservation indicators were not significantly influenced at high water supply levels (> 9000 mL/year). These results indicated that changes in water availability at low levels could affect leaf-level nutrient characteristics,especially for the species in semiarid ecosystems. Therefore,global changes in precipitation may pose effects on plant nutrient economy,and thus on nutrient cycling in the plant-soil systems. | Ju-Ying Huang Hai-Long Yu Ling-Hao Li Zhi-You Yuan Samuel Barrels | 2009 | Journal of Integrative Plant Biology2009，51，11： | 12 |
| 2 | Genetic analysis of the capsular biosynthetic locus from all 90 pneumococcal serotypes 显示文摘 | Bentley SD Aanensen DM Mavroidi A Saunders D Rabbinowitsch E Collins M Donohoe K Harris D Murphy L Quail MA Samuel G Skovsted IC Kaltoft MS Barrell B Reeves PR Parkhill J Spratt BG | 2006 | PLoS Genet2006，2，3： | 1 |
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