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| Titel |
Short-term grazing exclusion has no impact on soil properties and nutrients of degraded alpine grassland in Tibet, China |
| VerfasserIn |
X. Lu, Y. Yan, J. Sun, X. Zhang, Y. Chen, X. Wang, G. Cheng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 4 ; Nr. 6, no. 4 (2015-11-05), S.1195-1205 |
| Datensatznummer |
250115522
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| Publikation (Nr.) |
 copernicus.org/se-6-1195-2015.pdf |
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| Zusammenfassung |
| Since the 1980s, alpine grasslands have been seriously degraded on the
Tibetan Plateau. Grazing exclusion by fencing has been widely adopted to
restore degraded grasslands. To clarify the effect of grazing exclusion on
soil quality, we investigated soil properties and nutrients by comparing
free-grazing (FG) and grazing exclusion (GE) grasslands in Tibet. Soil
properties – including soil bulk density, pH, particle size distributions,
and proportion of aggregates – showed no significant difference between FG
and GE plots. Soil organic carbon, soil available nitrogen, and available
phosphorus contents did not differ with grazing exclusion treatments in both
the 0–15 and 15–30 cm layer. However, soil total nitrogen and total
phosphorus contents were remarkably reduced due to grazing exclusion at
0–15 cm depth. Furthermore, growing season temperature and/or growing season
precipitation had significant effects on almost all soil property and
nutrient indicators. This study demonstrates that grazing exclusion had no
impact on most soil properties and nutrients in Tibet. Additionally, the
potential shift of climate conditions should be considered when recommending
any policy designed for restoration of degraded soil in alpine grasslands in the
future. Nevertheless, because the results of the present study come from a
short-term (6–8 years) grazing exclusion, the assessments of the ecological
effects of the grazing exclusion management strategy on soil quality of
degraded alpine grasslands in Tibet still need long-term continued research. |
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