at Google ScholarTitle data
Liu, Shibin ; Schleuss, Per-Marten ; Kuzyakov, Yakov:
Carbon and nitrogen losses from soil depend on degradation of Tibetan Kobresia pastures.
In: Land Degradation & Development.
Vol. 28
(2016)
Issue 4
.
- pp. 1253-1262.
ISSN 1099-145X
DOI: https://doi.org/10.1002/ldr.2522
Abstract in another language
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.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Additional notes: | BAYCEER138931 |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology Research Institutions Research Institutions > Research Centres Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science |
| Date Deposited: | 12 Jan 2018 12:39 |
| Last Modified: | 12 Jan 2018 12:39 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/41309 |