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| 1 | The Ozone Component of Global Change:Potential Effects on Agricultural and Horticultural Plant Yield,Product Quality and Interactions with Invasive Species显示文摘The productivity,product quality and competitive ability of important agricultural and horticultural plants in many regions of the world may be adversely affected by current and anticipated concentrations of ground-level ozone(O3).Exposure to elevated O3 typically results in suppressed photosynthesis,accelerated senescence,decreased growth and lower yields.Various approaches used to evaluate O3 effects generally concur that current yield losses range from 5% to 15% among sensitive plants.There is,how-ever,considerable genetic variability in plant responses to O3.To illustrate this,we show that ambient O3 concentrations in the eastern United States cause substantially different levels of damage to otherwise similar snap bean cultivars.Largely undesirable effects of O3 can also occur in seed and fruit chemistry as well as in forage nutritive value,with consequences for animal production.Ozone may alter herbicide efficacy and foster estab-lishment of some invasive species.We conclude that current and projected levels of O3 in many regions worldwide are toxic to sensitive plants of agricultural and horticultural significance.Plant breeding that incorporates O3 sensitivity into selection strategies will be increasingly necessary to achieve sustainable production with changing atmospheric composition,while reductions in O3 precursor emissions will likely benefit world food pro-duction and reduce atmospheric concentrations of an important greenhouse gas. | Fitzgerald Booker Russell Muntifering Margaret McGrath Kent Burkey Dennis Decoteau Edwin Fiscus William Manning Sagar Krupa Arthur Chappelka David Grantz | 2009 | Journal of Integrative Plant Biology2009，51，4： | 18 |
| 2 | 宜黄自然保护区华南虎野生种群调查及栖息地评价显示文摘江西省宜黄县省级自然保护区以华南虎 (Pantheratigrisamoyensis)为主要保护对象 ,是近几年发现华南虎证据最多的区域 .中美华南虎联合考察队于 2 0 0 1年 3 7月对该保护区进行了调查 ,采用访问调查法、样线调查法、痕迹调查法、红外线自动照相技术等目前国际国内通用的方法和技术 .该次考察虽未证实该区域华南虎存在的确切信息 ,但较系统地调查了该区域的生境资料 ,初步评价了华南虎的生存环境 .其结论为 ,由于乱捕滥猎、过度的经济活动、栖息地缩小和破碎化是导致目前华南虎极度濒危甚至难觅其踪迹的主要原因 .该区域历史上是华南虎较多的区域 ,目前仍具备华南虎生存的基本条件 . | 黄祥云 胡德夫 刘伟石 Jeff Muntifering | 2003 | 北京林业大学学报2003，25，4： | 17 |
| 3 | Effect of monensin on nitrogen utilization and digestibility of concentrate diets by steers显示文摘 | R B Muntifering B Theurer R S Swingle | 1980 | Journal of Animal Science1980，50，： | 1 |
| 4 | Effect of dietary protein level on nitrogen metabolism in lambs: studies using is N-nitrogen显示文摘 | Bunting L D Boling J A MacKown C T Muntifering R B | 1987 | Journal of Animal Science1987，64，： | 1 |
| 5 | Ozone and increased nitrogen supply effects on the yield and nutritive quality of Trifolium subterraneum显示文摘 | Sanz J Muntifering R B Bermejo V | 2005 | Atmospheric Environment2005，39，： | 1 |
| 6 | Dramatic decline of wild South China tigers: field survey of priority tiger reserves显示文摘 | Tilson R Hu D F Muntifering J | 2004 | Oryx2004，38，1： | 1 |
| 7 | Dramatic decline of wild South China tigers Panthera tigris amoyensis : field survey of pri- ority tiger reserves 显示文摘 | Tilson R H Muntifering J Nyhus P J | 2004 | Oryx2004，38，1： | 1 |
| 8 | Dramatic decline of wild South China tigers Panthera tigris amoyensis:field survey of priority tiger reserves显示文摘 | Tilson R Hu Defu Muntifering J | | 0，，01： | 1 |
| 9 | Dramatic decline of wild South China tigers Panthera tigris amoyensis : field survey of priority ti- ger reserves 显示文摘 | Tilson R Defu H Muntifering J | 2004 | Oryx2004，38，1： | 1 |
| 10 | Forage production and persistence characteristics of grazed native warm-season grass mixtures with or without nitrogen fertilizer显示文摘Background:Native warm-season grass(NWSG)mixtures may provide a lownitrogen(N)-input summer perennial forage option to extensively managed forage-livestock systems.Methods:Mixed pastures of big bluestem(Andropogon gerardii Vitman),little bluestem(Schizachyrium scoparium Michx.),and indiangrass(Sorghastrum nutans L.)fertilized with 0 or 67 kgNha−1 were continuously stocked with beef heifers and cows.Forage mass,nutritive value,and canopy heights were determined every 2 weeks during the grazing season.Stand persistence measures included the canopy cover and leaf area index(LAI)and plant crown density at spring emergence following 3 years of grazing management.Results:Forage mass,canopy height,and stocking densities were greater for N-fertilized NWSG than unfertilized NWSG for the first 30 days of the growing season across the 3-year study.Forage NWSG fertilized with N had a greater decrease in LAI during the growing season(51%decrease)than unfertilized NWSG.Spring NWSG plant density estimates following 3 years of grazing did not differ across N management strategies.Conclusions:Forage NWSG mixtures supported superior forage attributes and greater stocking densities early in the grazing season under low-level N than zero-N-input systems and may provide a low-N-input alternative for improved species use in southeastern US forage-livestock systems. | Caroline Nicole Chappell Marty Landon Marks Katie Michelle Mason Liliane Severino da Silva Joshua Luke Jacobs Mary Kimberly Mullenix Sandra Leanne Dillard Russell Brian Muntifering | 2022 | Grassland Research2022，1，3： | 0 |
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