Response of biomass spatial pattern of alpine vegetation to climate change in permafrost region of the Qinghai-Tibet Plateau,China |
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Authors: | Yu Zhang Genxu Wang Yibo Wang |
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Institution: | (1) Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Chaoyang District, Beijing, 100101, People’s Republic of China;(2) Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing, 210042, China;(3) International Centre for Integrated Mountain Development, G.P.O. Box 3226, Khumaltar, Kathmandu, Nepal;(4) Graduate School of Chinese Academy of Sciences, Beijing, 100049, China; |
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Abstract: | Alpine ecosystems in permafrost region are extremely sensitive to climate changes. To determine spatial pattern variations
in alpine meadow and alpine steppe biomass dynamics in the permafrost region of the Qinghai-Tibet Plateau, China, calibrated
with historical datasets of above-ground biomass production within the permafrost region’s two main ecosystems, an ecosystem-biomass
model was developed by employing empirical spatialdistribution models of the study region’s precipitation, air temperature
and soil temperature. This model was then successfully used to simulate the spatio-temporal variations in annual alpine ecosystem
biomass production under climate change. For a 0.44°C decade-1 rise in air temperature, the model predicted that the biomasses
of alpine meadow and alpine steppe remained roughly the same if annual precipitation increased by 8 mm per decade−1, but the biomasses were decreased by 2.7% and 2.4%, respectively if precipitation was constant. For a 2.2°C decade−1 rise in air temperature coupled with a 12 mm decade−1 rise in precipitation, the model predicted that the biomass of alpine meadow was unchanged or slightly increased, while that
of alpine steppe was increased by 5.2%. However, in the absence of any rise in precipitation, the model predicted 6.8% and
4.6% declines in alpine meadow and alpine steppe biomasses, respectively. The response of alpine steppe biomass to the rising
air temperatures and precipitation was significantly lesser and greater, respectively than that of alpine meadow biomass.
A better understanding of the difference in alpine ecosystem biomass production under climate change is greatly significant
with respect to the influence of climate change on the carbon and water cycles in the permafrost regions of the Qinghai-Tibet
Plateau. |
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Keywords: | Permafrost change Qinghai-Tibetan Plateau Alpine ecosystem Grassland biomass Climate change Response model |
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