Wild Rice Population Oscillations, Allocation Patterns, and Nutrient Cycles

野生稻种群波动、分配模式和养分循环

• 批准号: 0715808
• 负责人: John Pastor
• 金额: $ 54.7万
• 依托单位: University of Minnesota Duluth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0715808&HistoricalAwards=false
• 关键词: Wild; Rice; Population; Oscillations; Allocation

Plant populations such as wild rice typically undergo oscillations or boom-and-bust cycles. Ecological theory predicts that any delay in delivery of limiting resources to a population will cause it to oscillate. Previous modeling and experimental work has demonstrated that slow decay of wild rice shoot litter indeed causes oscillations in live populations, by delaying nutrient availability during the growing season. But roots decompose even more slowly than shoots, so allocation of growth to roots to obtain nutrients may exacerbate these oscillations. This study will examine the factors that control root, shoot, and seed production, and how they both depend upon and change nutrient availability. The experimental results will be used to improve a computer model that simulates growth and yield of wild rice.Besides being ecologically interesting, wild rice is an important staple and sacred food for members of Minnesota's Ojibway (Chippewa) tribe. The Ojibway tribe manages over a dozen wild rice lakes in northeastern Minnesota for wild rice production in as natural a manner as possible. This research will involve close collaboration with tribal biologists of the Fond du Lac band of Ojibway. Students will be recruited from the tribal community college to assist in this work. This will show tribal students the potentials of a career in the environmental sciences.

像野生稻这样的植物种群通常会经历振荡或繁荣与萧条的周期。生态学理论预测，在有限的资源交付给人口的任何延迟将导致它的振荡。先前的建模和实验工作已经证明，野生稻枝条凋落物的缓慢腐烂确实会通过延迟生长季节的养分供应而导致活种群的振荡。但根的分解速度甚至比芽更慢，因此将生长分配给根以获取营养可能会加剧这些振荡。本研究将探讨控制根，芽和种子生产的因素，以及它们如何依赖和改变养分的可用性。实验结果将被用来改进一个模拟野生稻生长和产量的计算机模型。除了生态上的有趣，野生稻是明尼苏达州奥吉布韦（齐佩瓦）部落成员的重要主食和神圣食物。Ojibway部落在明尼苏达州东北部管理着十几个野生稻湖，以尽可能自然的方式生产野生稻。这项研究将涉及与Ojibway的丰迪拉克部落生物学家的密切合作。将从部落社区学院招募学生协助这项工作。这将向部落学生展示环境科学职业的潜力。