Saturday , April 17 2021

Ecosystems around the world breathe differently in response to rising temperatures



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Credit: Unsplash / CC0 Public Domain

Soils store huge amounts of carbon, but a new study led by Dr. Alice Johnston of Carnfield University suggests that how much of this carbon enters the atmosphere as the temperature rises depends on how wide the earth sits from the line.

Land-based ecosystems are made up of plants, soils, animals and bacteria – all of which grow, reproduce, die and breathe a common currency; carbon. And some of the same breathable carbon (also known as ecosystem respiration) compared to the amount stored (through primary production) has effects on climate change.

A major concern is that if more carbon is used than stored, the rate of climate change may accelerate even further. However, there are big assumptions in the models used to predict climate change – that the breathing of the ecosystem rises with the temperature at the same rate (doubles the temperature rise of 10 degrees Celsius) regardless of the ecosystem itself. A new study “Breathable Temperature Threshold of the World-Scale Ecosystem” was published in Nature Ecology and evolution An international group of scientists led by Dr. Alice Johnston of Cranfield University and Professor Chris Wendity of the University of Reading, however, suggest that there are two main “thresholds” to this relationship.

The study, funded by the Leverhulme Trust, shows that the breath of the ecosystem does not rise as much as the temperature in warm (Mediterranean and tropical) climates compared to mild (temperate) climates, but shows an extreme increase with the temperature in cold (boreal and tundra) climates. This finding contradicts several studies that show a static-respiratory-respiratory relationship around the world but agree with observations made in different ecosystems.

First author Dr. Alice Johnston, a lecturer in environmental data science at Cranfield University, said: “Ecosystems are extremely complex, and there is a huge variety in the amount and type of plants, animals and bacteria present in one field compared to next year. Not to mention global ecosystems. Given the same changing patterns in biodiversity, we would expect changes in the way ecosystem respiration responds to temperature because different species exhibit different temperature sensitivities. Our study is very simple and does not capture all of this variation, but it does capture three clear differences in the breathing pattern of the ecosystem at 210 sites distributed worldwide.

“Basically, our results show that temperature has a weak effect on the respiration of ecosystems in Mediterranean and tropical ecosystems, a well-understood effect in temperate ecosystems, and a widespread impact on borile and tundra ecosystems. Rising temperatures.On the other hand, if CO2 Fertilization in the tropics promotes primary production and rising temperatures inhibit the respiration of the ecosystem, a warmer climate could become an even more important carbon sink. Regardless, this research really suggests that we need to better understand the causes of these thresholds and the vital role that biodiversity loss can play. This will not only improve climate change forecasts, but will also encourage conservation efforts. “

Professor Chris Wenditi, Professor of Evolutionary Biology at the University of Reading, added: “The impact of plant diversity on the national carbon cycle is far more well-known than a variety of animals. In the future we must focus our attention on identifying general but realistic ways. We can determine the loss of biodiversity or achieve turning points beyond which the biosphere carbon sinks are improved or reduced. ”


A new study has found that the Earth will reach a turning point in temperature in the next 20 to 30 years


more information:
Alice SA Johnston et al. Global-scale respiratory temperature thresholds, Natural ecology and evolution (2021). DOI: 10.1038 / s41559-021-01398-z

Provided by Carnfield University

quotation: Ecosystems around the world breathe differently in response to rising temperatures (2021, March 1). Replaced March 1, 2021 from https://phys.org/news/2021-03-ecosystems-globe-differently-response-temperatures.html

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