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Degradation of Tibetan grasslands: Consequences for carbon and nutrient cycles

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dc.date.accessioned 2019-01-22T20:35:43Z
dc.date.available 2019-01-22T20:35:43Z
dc.date.issued 2018
dc.identifier.issn 0167-8809
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/147878
dc.description.abstract © 2017 Elsevier B.V. The Tibetan Plateau hosts the world's largest alpine pastoral ecosystems, dominated by the endemic sedges Kobresia pygmaea and Kobresia humilis. Owing to the very harsh environment and also to soil nitrogen (N) and phosphorus (P) limitations, these pastoral ecosystems are very sensitive to disturbances (e.g. anthropogenic activities and climate change) and recover extremely slowly. Overgrazing on the Tibetan Plateau has caused severe degradation of vegetation and soils in the last 30–50 years. For the first time, for Kobresia pastures in Tibetan Plateau, we have summarized and generalized the consequences of pasture degradation for soil organic carbon (SOC) and nutrient (N, P) stocks, and evaluated the main biotic and abiotic mechanisms of their loss. Based on 44 literature studies as well as own data, we demonstrated that 42% of SOC stocks were lost, relative to non-degraded pastures. These SOC losses are similar to the decreases in N stocks (-33%), and aboveground (-42%) and belowground (-45%) plant biomass. Although P losses are lower (-17%), its precipitation reduces its availability for plants. These losses are in fact underestimates, since undisturbed natural sites no longer exist on the Tibetan Plateau. The losses are much higher in the upper 10 cm and in some areas extend to complete removal of soil cover. This has dramatic repercussions for local livestock, human populations and river pollution. While some rehabilitation projects have shown positive outcomes, the complete recovery of degraded pastures (e.g. soil fertility, ecosystem stability) is infeasible, because of very slow pedogenic processes, slow vegetation restoration, as well as continuously increasing anthropogenic pressure and climate change. Considering the rapid losses of SOC and nutrients, and the very slow recovery potential, Tibetan pastures in some regions may disappear in the next few decades without proper and effective recovery strategies.
dc.relation.ispartofseries Agriculture, Ecosystems and Environment
dc.subject Carbon sequestration
dc.subject Pasture degradation
dc.subject Soil nutrients
dc.subject Soil organic matter
dc.subject Tibetan plateau
dc.title Degradation of Tibetan grasslands: Consequences for carbon and nutrient cycles
dc.type Review
dc.relation.ispartofseries-volume 252
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 93
dc.source.id SCOPUS01678809-2018-252-SID85033444827


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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