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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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Monthly climatologies of air temperature (1962–2008, curve) and precipitation (1962–2008, columns) for three meteorological stations (Damxung, Bange, and Lhasa). The mean altitude of three meteorological stations is 4500 m.
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fig2: Monthly climatologies of air temperature (1962–2008, curve) and precipitation (1962–2008, columns) for three meteorological stations (Damxung, Bange, and Lhasa). The mean altitude of three meteorological stations is 4500 m.

Mentions: The mountain ridge is a climate divide. The SE region is located windward to the summer Monsoon. The NW area drains into Nam Co Lake. And the Westerly is prevailing in winter. The mountain climate above 5000 m is little known due to the lack of long-term meteorological records; the climate data can be analyzed from the closest weather stations (e.g., Bange, Damxung, and Lhasa, Figure 1). The area has the maximum monthly mean temperature of 11.5°C in July and minimum monthly mean temperature −7°C in January, and mean annual temperature is 3.3°C. The annual precipitation varies largely between the dry and wet seasons. The annual mean precipitation is 413 mm in recent four decades. Most of the precipitation (80–90%) falls in the warm (rainy) seasons (from May to September) (Figure 2).


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

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

Monthly climatologies of air temperature (1962–2008, curve) and precipitation (1962–2008, columns) for three meteorological stations (Damxung, Bange, and Lhasa). The mean altitude of three meteorological stations is 4500 m.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig2: Monthly climatologies of air temperature (1962–2008, curve) and precipitation (1962–2008, columns) for three meteorological stations (Damxung, Bange, and Lhasa). The mean altitude of three meteorological stations is 4500 m.
Mentions: The mountain ridge is a climate divide. The SE region is located windward to the summer Monsoon. The NW area drains into Nam Co Lake. And the Westerly is prevailing in winter. The mountain climate above 5000 m is little known due to the lack of long-term meteorological records; the climate data can be analyzed from the closest weather stations (e.g., Bange, Damxung, and Lhasa, Figure 1). The area has the maximum monthly mean temperature of 11.5°C in July and minimum monthly mean temperature −7°C in January, and mean annual temperature is 3.3°C. The annual precipitation varies largely between the dry and wet seasons. The annual mean precipitation is 413 mm in recent four decades. Most of the precipitation (80–90%) falls in the warm (rainy) seasons (from May to September) (Figure 2).

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