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dc.contributor.author | Liu S. | |
dc.contributor.author | Schleuss P. | |
dc.contributor.author | Kuzyakov Y. | |
dc.date.accessioned | 2018-09-19T21:03:55Z | |
dc.date.available | 2018-09-19T21:03:55Z | |
dc.date.issued | 2017 | |
dc.identifier.issn | 1085-3278 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/143545 | |
dc.description.abstract | Copyright © 2016 John Wiley & Sons, Ltd.Degradation of Kobresia pygmaea pastures has strongly increased on the Tibetan Plateau over the last few decades and contributed to a high loss of soil organic carbon and nutrients. The pathways of carbon (C) and nitrogen (N) losses from degraded K. pygmaea pastures are still unclear, but this is a prerequisite to assess the recovery of Tibetan grasslands. We investigated the response of day- and nighttime CO2 efflux and leaching of dissolved organic C and N, NH4+ and NO3- from K. pygmaea root mats in three degradation stages: living root mat, dying root mat and dead root mat. Dying root mat had the highest C loss as CO2 and as leached dissolved organic carbon. This indicates K. pygmaea pastures shift from a C sink to a C source following plant death. In contrast, living root mat had the lowest daytime CO2 efflux (0·38 ± 0·1 µg C g−1 h−1) because CO2 was assimilated via photosynthesis. Nighttime CO2 efflux positively correlated with soil moisture for living and dead root mats. It indicates that increasing precipitation might accelerate C losses due to enhanced soil organic carbon decomposition. Furthermore, dead root mat had the highest average NO3− loss (23 ± 2·6 mg N L−1) from leaching compared with other root mats. Consequently, leaching increases the negative impacts of pasture degradation on N availability in these often N limited ecosystems and thus impedes the recovery of K. pastures following degradation. Copyright © 2016 John Wiley & Sons, Ltd. | |
dc.relation.ispartofseries | Land Degradation and Development | |
dc.subject | CO efflux 2 | |
dc.subject | dissolved organic carbon | |
dc.subject | grassland degradation | |
dc.subject | Kobresia pygmaea pasture | |
dc.subject | NO leaching 3 − | |
dc.title | Carbon and Nitrogen Losses from Soil Depend on Degradation of Tibetan Kobresia Pastures | |
dc.type | Article | |
dc.relation.ispartofseries-issue | 4 | |
dc.relation.ispartofseries-volume | 28 | |
dc.collection | Публикации сотрудников КФУ | |
dc.relation.startpage | 1253 | |
dc.source.id | SCOPUS10853278-2017-28-4-SID84971492822 |