Journal
JOURNAL OF MOUNTAIN SCIENCE
Volume 10, Issue 4, Pages 687-698Publisher
SCIENCE PRESS
DOI: 10.1007/s11629-013-2557-0
Keywords
Heitutan degraded grassland; Alpine meadow; Restoration/rehabilitation; Sanjiangyuan; Qinghai-Tibet Plateau (QTP)
Categories
Funding
- Special Fund for Agroscientific Research in the Public Interest [201203041]
- National Natural Sciences Foundation of China [41161084]
- International Science & Technology Cooperation Program of China, MOST [2011DFG93160, 2011DFA20820]
- University of Auckland
- China Academy of Sciences
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In many ecosystems ungulates have coexisted with grasslands over long periods of time. However, high densities of grazing animals may change the floristic and structural characteristics of vegetation, reduce biodiversity, and increase soil erosion, potentially triggering abrupt and rapid changes in ecosystem condition. Alternate stable state theory provides a framework for understanding this type of dynamic. In the Sanjiangyuan atop the Qinghai-Tibetan plateau (QTP), grassland degradation has been accompanied by irruptions of native burrowing animals, which has accentuated the loss of ground cover. Severely degraded areas of alpine meadows are referred to as 'Heitutan'. Here, using the framework of alternate stable state theory, we describe the proximate and ultimate drivers of the formation of Heitutan on the QTP, and we assess prospects for recovery, in relation to the degree of biophysical alteration, of these alpine meadows. Effective rehabilitation measures must address the underlying causes of degradation rather than their symptoms. Heitutan degradation is not uni-causal. Rather it reflects different mechanisms operating at different spatio-temporal scales across this vast region. Underlying causes include overly aggressive exploitation of the grasslands (e.g. overgrazing), amplification of grazing and erosion damage by small mammals when outbreaks occur, and/or climate change. Given marked variability in environmental conditions and stressors, restorative efforts must vary across the region. Restoration efforts are likely to yield greatest success if moderately and severely degraded areas are targeted as the first priority in management programmes, before these areas are transformed into extreme Heitutan.
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