1 resultado para Research Subject Categories::NATURAL SCIENCES
em Collection Of Biostatistics Research Archive
Filtro por publicador
- KUPS-Datenbank - Universität zu Köln - Kölner UniversitätsPublikationsServer (1)
- Aberdeen University (8)
- Abertay Research Collections - Abertay University’s repository (2)
- Academic Archive On-line (Stockholm University; Sweden) (1)
- Academic Research Repository at Institute of Developing Economies (1)
- Acceda, el repositorio institucional de la Universidad de Las Palmas de Gran Canaria. España (1)
- AMS Tesi di Laurea - Alm@DL - Università di Bologna (1)
- Applied Math and Science Education Repository - Washington - USA (3)
- Aquatic Commons (57)
- ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (80)
- Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (1)
- Aston University Research Archive (1)
- Biblioteca Digital | Sistema Integrado de Documentación | UNCuyo - UNCUYO. UNIVERSIDAD NACIONAL DE CUYO. (5)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (32)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (16)
- Biblioteca Digital de Teses e Dissertações Eletrônicas da UERJ (7)
- Biodiversity Heritage Library, United States (12)
- Blue Tiger Commons - Lincoln University - USA (1)
- BORIS: Bern Open Repository and Information System - Berna - Suiça (8)
- Boston University Digital Common (3)
- Brock University, Canada (8)
- Bulgarian Digital Mathematics Library at IMI-BAS (5)
- Cambridge University Engineering Department Publications Database (1)
- CentAUR: Central Archive University of Reading - UK (60)
- Chapman University Digital Commons - CA - USA (1)
- Chinese Academy of Sciences Institutional Repositories Grid Portal (35)
- Cochin University of Science & Technology (CUSAT), India (7)
- Coffee Science - Universidade Federal de Lavras (1)
- Collection Of Biostatistics Research Archive (1)
- CORA - Cork Open Research Archive - University College Cork - Ireland (3)
- Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest (1)
- Dalarna University College Electronic Archive (6)
- Deakin Research Online - Australia (39)
- DI-fusion - The institutional repository of Université Libre de Bruxelles (4)
- Digital Commons - Michigan Tech (1)
- Digital Commons - Montana Tech (1)
- Digital Commons at Florida International University (1)
- Digital Peer Publishing (1)
- DigitalCommons@University of Nebraska - Lincoln (3)
- DRUM (Digital Repository at the University of Maryland) (1)
- eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (4)
- Escola Superior de Educação de Paula Frassinetti (1)
- Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (3)
- Helda - Digital Repository of University of Helsinki (15)
- Indian Institute of Science - Bangalore - Índia (10)
- Instituto Politécnico de Leiria (9)
- Instituto Politécnico de Santarém (1)
- Instituto Politécnico do Porto, Portugal (1)
- Instituto Superior de Psicologia Aplicada - Lisboa (1)
- Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (3)
- Lume - Repositório Digital da Universidade Federal do Rio Grande do Sul (2)
- Memoria Académica - FaHCE, UNLP - Argentina (15)
- Ministerio de Cultura, Spain (2)
- National Center for Biotechnology Information - NCBI (4)
- Open University Netherlands (1)
- Plymouth Marine Science Electronic Archive (PlyMSEA) (3)
- Portal de Revistas Científicas Complutenses - Espanha (1)
- Publishing Network for Geoscientific & Environmental Data (3)
- QSpace: Queen's University - Canada (2)
- QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (6)
- Queensland University of Technology - ePrints Archive (60)
- RCAAP - Repositório Científico de Acesso Aberto de Portugal (1)
- ReCiL - Repositório Científico Lusófona - Grupo Lusófona, Portugal (2)
- Repositório Aberto da Universidade Aberta de Portugal (1)
- Repositório Científico da Universidade de Évora - Portugal (3)
- Repositório Científico do Instituto Politécnico de Lisboa - Portugal (6)
- Repositório Científico do Instituto Politécnico de Santarém - Portugal (1)
- Repositorio de la Universidad de Cuenca (2)
- Repositório digital da Fundação Getúlio Vargas - FGV (6)
- Repositório Institucional da Universidade de Aveiro - Portugal (4)
- Repositório Institucional da Universidade de Brasília (2)
- Repositório Institucional da Universidade Federal do Rio Grande - FURG (2)
- Repositório Institucional da Universidade Tecnológica Federal do Paraná (RIUT) (1)
- Repositorio Institucional de la Universidad de La Laguna (5)
- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (74)
- Research Open Access Repository of the University of East London. (1)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (5)
- SAPIENTIA - Universidade do Algarve - Portugal (2)
- Universidad de Alicante (2)
- Universidad del Rosario, Colombia (6)
- Universidad Politécnica de Madrid (4)
- Universidade de Lisboa - Repositório Aberto (8)
- Universidade dos Açores - Portugal (1)
- Universidade Federal do Pará (11)
- Universidade Federal do Rio Grande do Norte (UFRN) (15)
- Universidade Metodista de São Paulo (4)
- Universitat de Girona, Spain (1)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (93)
- Université de Montréal, Canada (20)
- University of Connecticut - USA (1)
- University of Michigan (41)
- University of Queensland eSpace - Australia (2)
- University of Southampton, United Kingdom (1)
- University of Washington (9)
- WestminsterResearch - UK (2)
Resumo:
Human activity in the last century has led to a substantial increase in nitrogen (N) emissions and deposition. This N deposition has reached a level that has caused or is likely to cause alterations to the structure and function of many ecosystems across the United States. One approach for quantifying the level of pollution that would be harmful to ecosystems is the critical loads approach. The critical load is dei ned as the level of a pollutant below which no detrimental ecological effect occurs over the long term according to present knowledge. The objective of this project was to synthesize current research relating atmospheric N deposition to effects on terrestrial and aquatic ecosystems in the United States and to identify empirical critical loads for atmospheric N deposition. The receptors that we evaluated included freshwater diatoms, mycorrhizal fungi and other soil microbes, lichens, herbaceous plants, shrubs, and trees. The main responses reported fell into two categories: (1) biogeochemical, and (2) individual species, population, and community responses. The range of critical loads for nutrient N reported for U.S. ecoregions, inland surface waters, and freshwater wetlands is 1 to 39 kg N ha-1 y-1. This broad range spans the range of N deposition observed over most of the country. The empirical critical loads for N tend to increase in the following sequence for different life forms: diatoms, lichens and bryophytes, mycorrhizal fungi, herbaceous plants and shrubs, trees. The critical loads approach is an ecosystem assessment tool with great potential to simplify complex scientii c information and effectively communicate with the policy community and the public. This synthesis represents the i rst comprehensive assessment of empirical critical loads of N for ecoregions across the United States.