Investigation of Vegetation Dynamics of Mongolia Using Time Series of NDVI in Response to Temperature and Precipitation
Climate is one of the most important factors affecting the condition of vegetation. Plants are highly sensitive to climate change and display the most sensitive response to the effect of the climate change and environment, most particularly seen in the annual and seasonal alternat...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
National University of Mongolia
2011-12-01
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| Series: | Mongolian Journal of Biological Sciences |
| Subjects: | |
| Online Access: | http://mjbs.num.edu.mn/uploads/files/MJBS%20Volume%209%20Number%201-2%20December%202011/pdf/mjbs009-01-02-02.pdf |
| Summary: | Climate
is one of the most important factors affecting the condition of vegetation. Plants are
highly sensitive to climate change and display the most sensitive response to the effect of the climate
change and environment, most particularly seen in the annual and seasonal alternations of vegetation
productivity. Through the analysis of remotely sensed images, it is proved that vegetation indices can
give signifi cant information regarding vegetation. The main purpose of this study was to estimate
the infl uences of precipitation and temperature on spatio-temporal pattern of vegetation dynamics in
Mongolia using MODIS sensor derived NDVI images over the course of 10 years. The correlation
coeffi cient showed that mean growing season NDVI was correlated with both climatic factors,
but more signifi cantly correlated with precipitation (
r
2
=0.92,
p
=0.000) than temperature (
r
2
=0.55,
p
=0.013). Growing season precipitation slightly decreased with an annual average decrement of 0.2
mm (
r
2
=0.06). Meanwhile, the growing season mean temperature slightly increased over 10 years,
with an annual average increment of 0.01°C per year (
r
2
=0.003) from 2000 to 2009. However, the
relationship between NDVI and climatic factors, and their change trends have been varied spatially
and temporally. |
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| ISSN: | 1684-3908 2225-4994 |