SGER: New Insights into Calcium Cycling in Forests through Coupled Ca and Sr Isotopic Measurements
SGER:通过钙和锶耦合同位素测量对森林钙循环的新见解
基本信息
- 批准号:0411404
- 负责人:
- 金额:$ 5.27万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2004
- 资助国家:美国
- 起止时间:2004-04-01 至 2006-09-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Calcium (Ca) is an essential forest nutrient that is sensitive to leaching caused by acid rain and nitrogen deposition. Symbiotic fungi may provide plants access to calcium bound in soil minerals, but they too are sensitive to acid rain. Whether leached calcium can be replaced by calcium weathered from soil minerals may accordingly determine how plants adapt to polluted conditions. This issue has not been satisfactorily resolved because researchers have relied on imperfect analogs to study Ca cycling in forest ecosystems, namely strontium/calcium (Sr/Ca) values and Sr isotopic ratios (87Sr/86Sr). Although measurements of isotope ratios often provide powerful insights into internal cycling of elements, we lack basic baseline data on calcium isotope patterns. To examine how Ca and Sr cycling in forest ecosystems are coupled, we will test the partitioning of Ca and Sr elements and isotopes in: 1) cultured pine and birch seedlings with known calcium and strontium sources, and 2) samples carefully selected from field sites across natural and experimental nitrogen deposition gradients. We will specifically address 1) whether Ca isotopes fractionate between parts of trees (e.g., foliage vs. branches), 2) the links between other chemical signatures and Ca isotopic fractionation, 3) how symbiotic fungi affect plant calcium supply and plant calcium isotopes, and 4) how closely Sr/Ca and 87Sr/86Sr document Ca cycling. Seedling results will be compared with similar measurements from long-running nitrogen deposition experiments in hardwood and pine plots at the Harvard Forest Long-Term Ecological Research site. This project will serve the larger scientific community and the health of the nation's forests by evaluating a promising isotopic system for studying a key forest nutrient that is strongly affected by the anthropogenic acid rain prevalent in the northeast, southeast, and California. The project will also serve as the principal project for a female graduate student in biogeochemistry.
钙(Ca)是森林必需的营养物质,对酸雨淋滤和氮沉降十分敏感。共生真菌可能为植物提供土壤矿物质中的钙,但它们对酸雨也很敏感。土壤矿物质风化的钙能否代替淋出的钙,可能决定植物如何适应污染条件。这个问题还没有得到满意的解决,因为研究人员依赖于不完善的类似物来研究森林生态系统中的钙循环,即锶/钙(Sr/Ca)值和锶同位素比(87Sr/86Sr)。虽然同位素比率的测量通常为元素的内部循环提供有力的见解,但我们缺乏钙同位素模式的基本基线数据。为了研究森林生态系统中Ca和Sr循环是如何耦合的,我们将测试Ca和Sr元素和同位素的分配:1)已知钙和锶来源的培养松树和桦树幼苗,以及2)从自然和实验氮沉积梯度的野外地点精心挑选的样品。我们将具体讨论1)Ca同位素是否在树木的各个部分(如叶子和树枝)之间分离,2)其他化学特征与Ca同位素分离之间的联系,3)共生真菌如何影响植物钙供应和植物钙同位素,以及4)Sr/Ca和87Sr/86Sr记录Ca循环的密切程度。幼苗结果将与哈佛森林长期生态研究站在硬木和松木地块上进行的长期氮沉积实验的类似测量结果进行比较。该项目将通过评估一个有前途的同位素系统来研究一种关键的森林营养物质,从而为更大的科学界和国家森林的健康服务,这种营养物质受到东北部、东南部和加利福尼亚州普遍存在的人为酸雨的强烈影响。该项目也将作为生物地球化学女研究生的主要项目。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Erik Hobbie其他文献
Erik Hobbie的其他文献
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{{ truncateString('Erik Hobbie', 18)}}的其他基金
Fluid-Mediated Assembly of Nanocrystalline Silicon
纳米晶硅的流体介导组装
- 批准号:
1603445 - 财政年份:2016
- 资助金额:
$ 5.27万 - 项目类别:
Standard Grant
Quantification of Organic Nitrogen use in FACE and Culture Experiments
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1146328 - 财政年份:2012
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$ 5.27万 - 项目类别:
Standard Grant
Dissertation Research: Developing Biogeochemical Tracers of Apatite Weathering by Ectomycorrhizal Fungi
论文研究:开发外生菌根真菌磷灰石风化的生物地球化学示踪剂
- 批准号:
1210560 - 财政年份:2012
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$ 5.27万 - 项目类别:
Standard Grant
Photostable Luminescent Coatings Assembled from Flow-Purified Silicon Nanocrystals: Effects of Size, Packing Order, and Environment
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1133135 - 财政年份:2011
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$ 5.27万 - 项目类别:
Standard Grant
Modeling and Isotopes Link Mycorrhizal Fungi to Soil Carbon and Organic Nitrogen Use
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- 批准号:
1108074 - 财政年份:2011
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$ 5.27万 - 项目类别:
Standard Grant
Nanoscale Structural Rearrangement and Strain Softening in Ultra-Pure Nanotube Membranes
超纯纳米管膜中的纳米级结构重排和应变软化
- 批准号:
0969155 - 财政年份:2010
- 资助金额:
$ 5.27万 - 项目类别:
Standard Grant
Collaborative Research: Fungal Life History Strategies and Evolution: Insights from Isotopic Measurements and Phylogenetic Analysis
合作研究:真菌生活史策略和进化:同位素测量和系统发育分析的见解
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0843366 - 财政年份:2009
- 资助金额:
$ 5.27万 - 项目类别:
Standard Grant
Collaborative Research: Organic Nitrogen Cycling in Northern Hardwood - Conifer Forests
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0743348 - 财政年份:2008
- 资助金额:
$ 5.27万 - 项目类别:
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Collaborative Research: Most Arctic Plants Obtain Nitrogen by Symbiosis with Fungi: Development of a Radical Concept Cooperative Project with the Marine Biological Laboratory
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0612598 - 财政年份:2006
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$ 5.27万 - 项目类别:
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Collaborative Research: Relationship between Carbon Allocation to Mycorrhizal Fungi and Organic Nitrogen Use in Temperate Forests
合作研究:温带森林菌根真菌碳分配与有机氮利用之间的关系
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0614266 - 财政年份:2006
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$ 5.27万 - 项目类别:
Continuing Grant
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