dc.contributor.author |
Liu S. |
|
dc.contributor.author |
Schleuss P. |
|
dc.contributor.author |
Kuzyakov Y. |
|
dc.date.accessioned |
2018-09-19T21:03:49Z |
|
dc.date.available |
2018-09-19T21:03:49Z |
|
dc.date.issued |
2016 |
|
dc.identifier.issn |
1085-3278 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/143542 |
|
dc.description.abstract |
© 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±0·1μgCg-1h-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±2·6mgNL-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. |
|
dc.relation.ispartofseries |
Land Degradation and Development |
|
dc.subject |
CO efflux 2 |
|
dc.subject |
Dissolved organic carbon |
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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 in Press |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.source.id |
SCOPUS10853278-2016-SID84971492822 |
|