Limits...
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.

Show MeSH

Related in: MedlinePlus

The vegetation fraction maps of the WNR in (a) 1972, (b) 1991, and (c) 2009. The FV values show the percentage of vegetation cover in each pixel (image band composition RGB: 421).
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4150475&req=5

fig5: The vegetation fraction maps of the WNR in (a) 1972, (b) 1991, and (c) 2009. The FV values show the percentage of vegetation cover in each pixel (image band composition RGB: 421).

Mentions: Based on the limited data, the aim of this study was to investigate the characteristic of vegetation distribution with regard to elevation and response of long-term vegetation coverage to climate change in the Western Nyainqentanglha Range (WNR), central Tibetan Plateau. Mountain vegetation is particularly sensitive to climate change, especially at higher altitudes. As one of the most significant indicators of vegetation condition, the fraction of vegetation coverage was obtained from Landsat images as described in the Materials and Methods (Figure 5). A significant vegetation increase can be observed in this area during 1972–2009. The mean fraction of vegetation cover in 30/09/1972, 14/09/1991, and 30/08/2009 was 24.87%, 35.89%, and 42.88%, respectively, and increased by 18.01% in the period 1972–2009. The trend is in line with previous research results in Alps mountains [21].


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

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

The vegetation fraction maps of the WNR in (a) 1972, (b) 1991, and (c) 2009. The FV values show the percentage of vegetation cover in each pixel (image band composition RGB: 421).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig5: The vegetation fraction maps of the WNR in (a) 1972, (b) 1991, and (c) 2009. The FV values show the percentage of vegetation cover in each pixel (image band composition RGB: 421).
Mentions: Based on the limited data, the aim of this study was to investigate the characteristic of vegetation distribution with regard to elevation and response of long-term vegetation coverage to climate change in the Western Nyainqentanglha Range (WNR), central Tibetan Plateau. Mountain vegetation is particularly sensitive to climate change, especially at higher altitudes. As one of the most significant indicators of vegetation condition, the fraction of vegetation coverage was obtained from Landsat images as described in the Materials and Methods (Figure 5). A significant vegetation increase can be observed in this area during 1972–2009. The mean fraction of vegetation cover in 30/09/1972, 14/09/1991, and 30/08/2009 was 24.87%, 35.89%, and 42.88%, respectively, and increased by 18.01% in the period 1972–2009. The trend is in line with previous research results in Alps mountains [21].

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