RESEARCH PROGRESS ON THE IMPACT OF NITROGEN DEPOSITION ON GLOBAL GRASSLANDS
Carly J. STEVENS1(), Sofia BASTO2, Michael D. BELL3, Tianxiang HAO4,5, Kevin KIRKMAN6, Raul OCHOA-HUESO7
1. Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK 2. Unit of Ecology and systematics, Department of Biology, Faculty of Science, Pontificia University Javeriana, Carrera 3. No. 43-82 Ed. Jesús Emilio Ramírez (53), Bogotá, Colombia 4. National Park Service, Air Resources Division, Lakewood, CO 80235, USA 5. Synthesis Research Center of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 6. College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of Ministry of Education, Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, China Agricultural University, Beijing 100193, China 7. School of Life Sciences, University of KwaZulu-Natal, Durban, 4041, South Africa 8. Departament of Biology -IVAGRO, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Spain
● Grasslands in many regions of the world have been impacted by atmospheric nitrogen deposition.
● Nitrogen deposition commonly leads to reductions in species richness.
● Increases in biomass production is a common response to increased N deposition.
● In some parts of the world there has been limited research into the impacts of nitrogen deposition.
Grasslands are globally-important ecosystems providing critical ecosystem services. The species composition and characteristics of grasslands vary considerably across the planet with a wide variety of different grasslands found. However, in many regions grasslands have been impacted by atmospheric nitrogen deposition originating from anthropogenic activities with effects on productivity, species composition and diversity widely reported. Impacts vary across grassland habitats but many show declines in species richness and increases in biomass production related to soil eutrophication and acidification. At a continental level there is considerable variation in the research effort that has been put into understanding the impacts of nitrogen deposition. In Europe, North America and parts of Asia, although there are unanswered research questions, there is a good understanding of N deposition impacts in most grassland habitats. This is not the case in other regions with large knowledge gaps in some parts of the world. This paper reviews the impacts of N deposition on grasslands around the world, highlighting recent advances and areas where research is still needed.
. [J]. Frontiers of Agricultural Science and Engineering, 2022, 9(3): 425-444.
Carly J. STEVENS, Sofia BASTO, Michael D. BELL, Tianxiang HAO, Kevin KIRKMAN, Raul OCHOA-HUESO. RESEARCH PROGRESS ON THE IMPACT OF NITROGEN DEPOSITION ON GLOBAL GRASSLANDS. Front. Agr. Sci. Eng. , 2022, 9(3): 425-444.
• Changes in the ratio of reduced and oxidized N inputs • Recovery from N deposition
North America
• Changes in the ratio of reduced and oxidized N inputs • Individual species responses
South America
• Improved understanding of impacts of N on major grassland types • Understanding the role of N fixers and other plant soil interactions • Critical loads for major grassland types
Asia
• Recovery from N deposition • Experiments with low N inputs and high frequency additions to refine predictions of community response
Africa
• Improved understanding of impacts of N on major grassland types
Australia
• Improved understanding of impacts of N on major grassland types • Interactions between N deposition and water availability and other nutrients
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