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Alpine cold vegetation response to climate change in the western Nyainqentanglha range in 1972-2009.

Wang X, Sun Z, Zhou AG - ScientificWorldJournal (2014)

Bottom Line: This may be the result of the mountain effect.The variation appears to be associated with an increase in mean temperature of 0.05 °C per year and an increase in precipitation of 1.83 mm per year in the growing season of the past four decades.The results provide further evidence of alpine ecosystem change due to climate change in the central Tibetan Plateau.

View Article: PubMed Central - PubMed

Affiliation: School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China ; Laboratory of Basin Hydrology and Wetland Eco-Restoration, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China.

ABSTRACT
The Tibetan Plateau is regarded as one of the most climatic-sensitive regions all over the world. Long-term remote sensing data enable us to monitor spatial-temporal change in this area. The vegetation changes of the western Nyainqentanglha region were detected by using RS and GIS techniques. And the vegetation coverage was derived by the NDVI-SMA (spectral mixture analysis) methods. An incensement of vegetation was observed in the mountain areas during 1972-2009 with a mean vegetation coverage of 24.87%, 35.89%, and 42.88% in 30/09/1972, 14/09/1991, and 30/08/2009, respectively. The vegetation fraction increased by 18% in the period of 1972-2009. The bin with the elevation between 4400 and 5200 m had the highest vegetation coverage. This may be the result of the mountain effect. Alpine vegetation had a trend to increase and expand to higher altitudes with the climate change in the past 40 years. The variation appears to be associated with an increase in mean temperature of 0.05 °C per year and an increase in precipitation of 1.83 mm per year in the growing season of the past four decades. The results provide further evidence of alpine ecosystem change due to climate change in the central Tibetan Plateau.

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The increased fractional vegetation cover along the ascending elevation during the three periods of 1972–1991, 1991–2009, and 1972–2009.
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fig7: The increased fractional vegetation cover along the ascending elevation during the three periods of 1972–1991, 1991–2009, and 1972–2009.

Mentions: Figure 7 shows that it is obvious that the increased fractional vegetation cover is relatively lower but nearly the same during 1972–1991 and 1991–2009 with the elevation of 5400 m to 6000 m. It may reflect that the vegetation is sensitive to climate change at higher altitude. Although the rate of warming is speeding up compared to the past decades, the vegetation cover showed lower increase rate during 1991–2009 than that in the period of 1972–1991 (Figure 7). It implied that the increase in vegetation cover is not linearly related to temperature rising.


Alpine cold vegetation response to climate change in the western Nyainqentanglha range in 1972-2009.

Wang X, Sun Z, Zhou AG - ScientificWorldJournal (2014)

The increased fractional vegetation cover along the ascending elevation during the three periods of 1972–1991, 1991–2009, and 1972–2009.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4150475&req=5

fig7: The increased fractional vegetation cover along the ascending elevation during the three periods of 1972–1991, 1991–2009, and 1972–2009.
Mentions: Figure 7 shows that it is obvious that the increased fractional vegetation cover is relatively lower but nearly the same during 1972–1991 and 1991–2009 with the elevation of 5400 m to 6000 m. It may reflect that the vegetation is sensitive to climate change at higher altitude. Although the rate of warming is speeding up compared to the past decades, the vegetation cover showed lower increase rate during 1991–2009 than that in the period of 1972–1991 (Figure 7). It implied that the increase in vegetation cover is not linearly related to temperature rising.

Bottom Line: This may be the result of the mountain effect.The variation appears to be associated with an increase in mean temperature of 0.05 °C per year and an increase in precipitation of 1.83 mm per year in the growing season of the past four decades.The results provide further evidence of alpine ecosystem change due to climate change in the central Tibetan Plateau.

View Article: PubMed Central - PubMed

Affiliation: School of Environmental Studies, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China ; Laboratory of Basin Hydrology and Wetland Eco-Restoration, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China.

ABSTRACT
The Tibetan Plateau is regarded as one of the most climatic-sensitive regions all over the world. Long-term remote sensing data enable us to monitor spatial-temporal change in this area. The vegetation changes of the western Nyainqentanglha region were detected by using RS and GIS techniques. And the vegetation coverage was derived by the NDVI-SMA (spectral mixture analysis) methods. An incensement of vegetation was observed in the mountain areas during 1972-2009 with a mean vegetation coverage of 24.87%, 35.89%, and 42.88% in 30/09/1972, 14/09/1991, and 30/08/2009, respectively. The vegetation fraction increased by 18% in the period of 1972-2009. The bin with the elevation between 4400 and 5200 m had the highest vegetation coverage. This may be the result of the mountain effect. Alpine vegetation had a trend to increase and expand to higher altitudes with the climate change in the past 40 years. The variation appears to be associated with an increase in mean temperature of 0.05 °C per year and an increase in precipitation of 1.83 mm per year in the growing season of the past four decades. The results provide further evidence of alpine ecosystem change due to climate change in the central Tibetan Plateau.

Show MeSH
Related in: MedlinePlus