LTREB Renewal: Long-term studies of secondary succession and community assembly in the prairie-forest ecotone of eastern Kansas

LTREB 更新：堪萨斯州东部草原森林交错带次生演替和群落组装的长期研究

• 批准号: 1655500
• 负责人: Bryan Foster
• 金额: $ 36.02万
• 依托单位: University of Kansas Center for Research Inc
• 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: 2017-05-15 至 2023-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1655500&HistoricalAwards=false
• 关键词: LTREB; Renewal; Long; term; studies

Long-term studies are increasingly valuable as a means to evaluate and predict the responses of ecosystems to multiple global changes. This research program employs two long-term field experiments in Kansas grassland to evaluate the interplay of soil fertility, plant species interactions and regional processes governing the recovery of vegetation, biodiversity and ecosystem function on abandoned agricultural lands. Results from these long-term experiments will continue to yield basic insights into the dynamics and functioning of ecological communities following disturbance and in response to excess nutrients. The results will also inform the management, conservation and restoration of native grasslands. The project will continue to contribute to the development of the University of Kansas Field Station (KUFS), complement ongoing research at KUFS in grassland and restoration ecology, and support the education and training of graduate, undergraduate and high school students.These long-term experiments involve the manipulation of soil nutrient availability via fertilization and employ multi-species propagule additions to evaluate the contribution of plant propagule availability in the regulation of plant community and ecosystem dynamics. Experiment 1 involves factorial manipulations of soil Nitrogen (N) and Phosphorus (P) and was established on a site that was plowed prior to the initiation of the study, permitting examination of plant community assembly in the context of secondary succession initiated on bare soil. Experiment 2 involves factorial manipulations of N and annual haying. This experiment parallels Experiment 1 with manipulations of soil resources and propagule pools, but does so with different initial conditions and in the context of hay management and prairie hay meadow restoration. Together these complementary experiments address a range of questions and hypotheses in community ecology emerging from six related themes that will continue to guide research: 1) species coexistence and diversity; 2) patterns and mechanisms of ecological succession; 3) community assembly and meta-community dynamics; 4) linkage between community structure and ecosystem function; 5) grassland restoration and management; 6) collaborative research in community and ecosystem ecology. Continued sampling of both experiments for another five years will extend the core data sets (plant species abundances and productivity data) to a 21-year time series and permit comprehensive syntheses of vegetation dynamics over two-decades.

长期研究作为评价和预测生态系统对多种全球变化的反应的一种手段越来越有价值。本研究项目在美国堪萨斯州的草地上进行了两次长期的野外试验，以评估土壤肥力、植物物种相互作用和区域过程对撂撂地植被、生物多样性和生态系统功能恢复的影响。这些长期实验的结果将继续对生态群落在受到干扰和对营养过剩的反应后的动态和功能产生基本的见解。研究结果也将为本地草原的管理、保护和恢复提供参考。该项目将继续促进堪萨斯大学野外研究站（KUFS）的发展，补充KUFS正在进行的草原和恢复生态学研究，并支持研究生、本科生和高中生的教育和培训。这些长期试验包括通过施肥对土壤养分有效性的操纵，并采用多物种繁殖体添加来评估植物繁殖体有效性在植物群落和生态系统动态调节中的贡献。实验1涉及土壤氮(N)和磷(P)的因子操纵，并在研究开始前在一个犁过的地点建立，允许在裸露土壤上开始的次生演替背景下检查植物群落聚集。实验2涉及N的阶乘操作和每年的收割。本试验与试验1相似，对土壤资源和繁殖体库进行了处理，但在不同的初始条件下，在牧草管理和草原草甸恢复的背景下进行了不同的处理。这些互补的实验解决了一系列的问题和假设，这些问题和假设来自六个相关的主题，将继续指导研究：1)物种共存和多样性；2)生态演替模式与机制；3)社区聚集与元社区动态；4)群落结构与生态系统功能的联系；5)草地恢复与管理；6)群落与生态系统生态学的合作研究。对这两项实验继续进行5年的采样，将把核心数据集（植物物种丰度和生产力数据）扩展到21年的时间序列，并允许对20年来的植被动态进行全面综合。

项目成果

Seasonal Shifts in Diversity and Composition of a Tallgrass Prairie Restoration Have Implications for Sampling Time

高草草原恢复的多样性和组成的季节性变化对采样时间有影响

• DOI: 10.3368/er.41.1.16
• 发表时间: 2023
• 期刊: Ecological Restoration
• 影响因子: 1.6
• 作者: Betson, Naomi;Foster, Bryan Latimer
• 通讯作者: Foster, Bryan Latimer

Ambient changes exceed treatment effects on plant species abundance in global change experiments

• DOI: 10.1111/gcb.14442
• 发表时间: 2018-12-01
• 期刊: GLOBAL CHANGE BIOLOGY
• 影响因子: 11.6
• 作者: Langley, J. Adam;Chapman, Samantha K.;Tilman, David
• 通讯作者: Tilman, David