气温升高将使陆地生态系统发生重大变化

Over 80% of the world's ice-free land is at risk of profound ecosystem¹ transformation² by 2100, a new study reveals. "Essentially³, we would be leaving the world as we know it," says Sebastian Ostberg of the Potsdam Institute for Climate Impact Research, Germany. Ostberg and collaborators studied the critical impacts of climate change on landscapes and have now published their results in Earth System Dynamics⁴, an open access journal of the European Geosciences Union (EGU). The researchers state in the article that "nearly no area of the world is free" from the risk of climate change transforming landscapes substantially, unless mitigation（减轻，缓和） limits warming to around 2 degrees Celsius⁵ above preindustrial（工业化前的） levels.   Ecosystem changes could include boreal（北方的） forests being transformed into temperate⁶ savannas⁷（热带稀树草原）, trees growing in the freezing Arctic tundra⁸ or even a dieback of some of the world's rainforests. Such profound transformations⁹ of land ecosystems¹⁰ have the potential to affect food and water security, and hence impact human well-being¹¹ just like sea level rise and direct damage from extreme weather events.   The new Earth System Dynamics study indicates that up to 86% of the remaining natural land ecosystems worldwide could be at risk of major change in a business-as-usual scenario¹² (see note). This assumes that the global mean temperature will be 4 to 5 degrees warmer at the end of this century than in pre-industrial times -- given many countries' reluctance¹³ to commit to binding¹⁴ emissions¹⁵ cuts, such warming is not out of the question by 2100.   "The research shows there is a large difference in the risk of major ecosystem change depending on whether humankind continues with business as usual or if we opt¹⁶ for effective climate change mitigation," Ostberg points out.   But even if the warming is limited to 2 degrees, some 20% of land ecosystems -- particularly those at high altitudes and high latitudes¹⁷ -- are at risk of moderate or major transformation, the team reveals.   The researchers studied over 150 climate scenarios¹⁸, looking at ecosystem changes in nearly 20 different climate models for various degrees of global warming. "Our study is the most comprehensive and internally consistent analysis of the risk of major ecosystem change from climate change at the global scale," says Wolfgang Lucht, also an author of the study and co-chair of the research domain#p#分页标题#e#¹⁹ Earth System Analysis at the Potsdam Institute for Climate Impact Research.   Few previous studies have looked into the global impact of raising temperatures on ecosystems because of how complex and interlinked these systems are. "Comprehensive theories and computer models of such complex systems and their dynamics up to the global scale do not exist."   To get around this problem, the team measured simultaneous changes in the biogeochemistry of terrestrial vegetation and the relative abundance of different vegetation species. "Any significant change in the underlying²⁰ biogeochemistry presents an ecological²¹ adaptation challenge, fundamentally destabilising our natural systems," explains Ostberg.   The researchers defined a parameter²² to measure how far apart a future ecosystem under climate change would be from the present state. The parameter encompasses²³ changes in variables such as the vegetation structure (from trees to grass, for example), the carbon stored in the soils and vegetation, and freshwater availability. "Our indicator²⁴ of ecosystem change is able to measure the combined effect of changes in many ecosystem processes, instead of looking only at a single process," says Ostberg.   He hopes the new results can help inform the ongoing²⁵ negotiations²⁶ on climate mitigation targets, "as well as planning adaptation to unavoidable change."