权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

EAGER: Assessing the role of trophic interactions on peatland carbon cycling under varied nutrient availability

EAGER：评估不同养分可用性下营养相互作用对泥炭地碳循环的作用

基本信息

批准号：
1651195
负责人：
Kevin Wyatt
金额：
$ 29.79万
依托单位：
Ball State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-05-01 至 2021-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1651195&HistoricalAwards=false
关键词：
EAGER Assessing role trophic interactions

项目摘要

Peatlands in the far north store a very large amount of carbon in their cold (sometimes frozen) and wet soils. While the cold, wet environment is clearly important, the biological factors that cause so much peat to accumulate in these ecosystems are not entirely understood. This project will study how changes in peat carbon cycling at the Bonanza Creek Long-Term Ecological Research site vary with nutrient availability. Researchers will conduct experiments to test hypotheses concerning the importance of algae and the food web of insects and invertebrates that algal production supports, to accumulation of carbon in peatlands. Food webs are a poorly know aspect of peatland ecology, and a better understanding of what controls biotic interactions within them will have profound implications for understanding the global carbon cycle. In addition to charting new conceptual ground in ecosystem science, this project will support two early career researchers, involve undergraduate students from under-represented groups, and train two graduate students.This Early-concept Grant for Exploratory Research (EAGER) project challenges the notion that energy flow within the food web of boreal peatlands is limited to detrital pathways. Through a contribution of carbon subsidies and by modifying redox potential for heterotrophic microorganisms, the investigators propose that algal photosynthesis fuels a microbial loop and contributes to ecosystem carbon and nitrogen fluxes. The research will evaluate the relative importance of bottom-up versus top-down effects (and their interactions) on boreal peatland food webs using a factorial experiment to test three hypotheses: 1) Under low nutrient availability, algal biomass is constrained and decomposition is primarily regulated by detrital pathways. 2) Increasing nutrient availability promotes algal biomass and the transfer of energy to grazers, releasing higher trophic levels from resource limitation. 3) The presence of a second energy pathway in algae (edible vs. inedible) mutes the trophic cascade, leading to greater stability (i.e., lower coefficients of variance) in food web structure than would be expected with strong top-down control of a homogenous edible community.

极北地区的泥炭地在其寒冷（有时是冰冻的）和潮湿的土壤中储存了大量的碳。虽然寒冷潮湿的环境显然很重要，但导致这些生态系统中积累如此多泥炭的生物因素并不完全清楚。该项目将研究如何在富矿溪长期生态研究网站泥炭碳循环的变化与营养的可用性。研究人员将进行实验，以测试有关藻类以及藻类生产所支持的昆虫和无脊椎动物食物网对泥炭地碳积累的重要性的假设。食物网是泥炭地生态学知之甚少的一个方面，更好地了解是什么控制了其中的生物相互作用，将对理解全球碳循环产生深远的影响。除了绘制生态系统科学的新概念基础，该项目将支持两个早期的职业研究人员，涉及来自代表性不足的群体的本科生，并培训两名研究生。这个早期概念探索性研究资助（EAGER）项目挑战了北方泥炭地食物网内的能量流动仅限于碎屑途径的概念。通过碳补贴的贡献，并通过修改异养微生物的氧化还原电位，研究人员提出，藻类光合作用燃料的微生物循环，并有助于生态系统的碳和氮通量。该研究将评估自下而上与自上而下的影响（及其相互作用）对北方泥炭地食物网的相对重要性，使用析因实验来测试三个假设：1）在低养分可用性下，藻类生物量受到限制，分解主要受碎屑途径调节。2)增加养分供应促进藻类生物量和能量向食草动物的转移，从而从资源限制中释放出更高的营养水平。3)藻类中第二种能量途径的存在（可食用与不可食用）使营养级联静音，导致更大的稳定性（即，较低的变异系数）的食物网结构比预期的强自上而下的控制同质食用社区。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Letter: Trophic interactions regulate peatland carbon cycling

信件：营养相互作用调节泥炭地碳循环

DOI：
10.1111/ele.13697
发表时间：
2021
期刊：
Ecology Letters
影响因子：
8.8
作者：
Wyatt, Kevin H.;McCann, Kevin S.;Rober, Allison R.;Turetsky, Merritt R.;Wang, ed., Shaopeng
通讯作者：
Wang, ed., Shaopeng

Consequences of Increased Variation in Peatland Hydrology for Carbon Storage: Legacy Effects of Drought and Flood in a Boreal Fen Ecosystem

碳储存泥炭地水文变化增加的后果：北方沼泽生态系统中干旱和洪水的遗留影响

DOI：
10.3389/feart.2020.577746
发表时间：
2021
期刊：
Frontiers in Earth Science
影响因子：
2.9
作者：
Kane, Evan S.;Dieleman, Catherine M.;Rupp, Danielle;Wyatt, Kevin H.;Rober, Allison R.;Turetsky, Merritt R.
通讯作者：
Turetsky, Merritt R.

Greening of the boreal peatland food web: Periphyton supports secondary production in northern peatlands

北方泥炭地食物网的绿化：附生植物支持北部泥炭地的二次生产

DOI：
10.1002/lno.11719
发表时间：
2021
期刊：
Limnology and Oceanography
影响因子：
4.5
作者：
Ferguson, Hannah M.;Slagle, Elizabeth J.;McCann, Ann Ashlea;Walls, Jeremy T.;Wyatt, Kevin H.;Rober, Allison R.
通讯作者：
Rober, Allison R.

Legacy effects of drought alters the aquatic food web of a northern boreal peatland

干旱的遗留影响改变了北部北方泥炭地的水生食物网

DOI：
10.1111/fwb.12950
发表时间：
2017
期刊：
Freshwater Biology
影响因子：
2.7
作者：
DeColibus, Dawn T.;Rober, Allison R.;Sampson, Avery M.;Shurzinske, Amanda C.;Walls, Jeremy T.;Turetsky, Merritt R.;Wyatt, Kevin H.
通讯作者：
Wyatt, Kevin H.

Warming enhances the stimulatory effect of algal exudates on dissolved organic carbon decomposition