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| 1 | Restoration Prospects for Heitutan Degraded Grassland in the Sanjiangyuan显示文摘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 toyield 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. | LI Xi-lai PERRY LW George BRIERLEY Gary GAO Jay ZHANG Jing YANG Yuan-wu | 2013 | Journal of Mountain Science2013，10，4： | 23 |
| 2 | Fatal Kawasaki disease with coronary arteritis and no coronary aneruysms显示文摘 | Burke AP Virmani R Perry LW | 1998 | Pediatrics1998，101，1： | 1 |
| 3 | Increased vascular endothelial growth factor transcription in residual hepatocellular carcinoma after open versus laparoscopic hepatectomy in a small animal model 显示文摘 | Perry KA Enestvedt CK Hosack LW | 2010 | Surg Endosc2010，24，5： | 1 |
| 4 | Fatal Kawasaki disease with coronary arteritis and no coronary aneruysms 显示文摘 | Burke AP Virmani R Perry LW | 1998 | Pediatrics1998，101，1： | 1 |
| 5 | Aortieo-left ventricular tunnel: clinical profile, diagnostic features, and surgical consider- atians显示文摘 | Okoroma EO Perry LW Scott LP | 1976 | J Thorae Cardiovasc Surg1976，71，2： | 1 |
| 6 | Premature rup-ture of membranes at term with an unfavourable cervix:comparison of expectant management,vaginal prostaglan-din,and oxytocin induction显示文摘 | McCauliv JF Rogers LW Perry KG | 1997 | South Med J1997，90，12： | 1 |
| 7 | The role of root exudates in rhizosphere interactions with plants and other organisms显示文摘 | Bais HP Tiffany LW Perry LG Gilroy S Vivanco JM | 2006 | Annual Review of Plant Biology2006，57，： | 1 |
| 8 | Fatal Kawaski disease with coronary arteritis and no corouysms aneruysms显示文摘 | Burke AP Virmani R Perry LW | 1998 | Pediatrics1998，101，： | 1 |
| 9 | Aort ico-left ventricular tunnel:clinical prof ile,diagnostic features,and surgical considerations显示文摘 | Okoroma EO Perry LW Scott LP | 1976 | J Thorac Cardiovasc Surg1976，71，： | 1 |
| 10 | Increased vascular en- dothelial growth factor transcription in residual hepatocellular car- cinoma after open versus laparoscopic hepatectomy in a small ani- mal model 显示文摘 | Perry KA Enestvedt CK Hosack LW | 2010 | Surg Endosc2010，24，： | 1 |
| 11 | Fatal Kawasaki disease with coronary arteries and coronary aneurysms显示文摘 | Burke AP V irmani R Perry LW | 1998 | Pediatrics1998，101，： | 1 |
| 12 | Current approaches to modelling the spread of wildland fire: a review显示文摘 | Perry G LW | 1998 | Progress in Physical Geography1998，22，2： | 1 |
| 13 | Management of Fournier's gangrene:an eleyen year retrospective amalysis of early recognition,diagnosis,and treatment显示文摘 | NORTON KS JOHNSON LW PERRY T | 2002 | Am Surg2002，68，8： | 1 |
| 14 | Quality of life after surgical treatment of the larynx显示文摘 | De Santo LW Olsen KD Perry WC | 1995 | Ann Otol Rhinoi Laryngol1995，104，101： | 1 |
| 15 | A common variant in the FTO gene is associated with body mass index and predisposes to childhood and adult obesity 显示文摘 | Frayling TM Timpson N J Weedon MN Zeggini E Freathy RM Lindgren CM Perry JR Elliott KS Lango H Rayner NW Shields B Harries LW Barrett JC Ellard S Groves C J Knight B Patch AM Ness AR Ebrahim S Lawlor DA Ring SM Ben-Shlomo Y Jarvelin MR Sovio U Bennett A J Melzer D Ferrucci L Loos RJ Barroso I Wareham N J Karpe F Owen KR Cardon LR Walker M Hitman GA Palmer CN Doney AS Morris AD Smith GD Hattersley AT McCarthy MI 2007 | 2007 | Science2007，316，： | 1 |
| 16 | Left ventricular false tendons in children prevalence as detected by 2 - dimensional echocardiograpy and clinical signifincance显示文摘 | Perry LW | 1983 | Am J Cardiol1983，52，： | 1 |
| 17 | Left ventricular false tendons in children:prevalence as detected by 2-dimensional echocardiography and clinical significance显示文摘 | Perry LW Ruckman RN Shapiro SR | 1983 | Am J Cardiol1983，52，10： | 1 |
| 18 | Left ventricular false tendons in children: prevalence as detected by 2-Dimensional Echocardiography and clinical significance 显示文摘 | Perry LW Ruckman RN Shapiro SR | 1983 | Am J Cardiol1983，52，10： | 1 |
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