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| The Influence of Farmland Expansion Using MODIS Data on Temperature in an Agricultural Area of Sanjiang Plain |
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| KeyWord:temperature; farmland expansion; land use; MODIS; MM5; irrigation |
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| Abstract: |
| The response of land surface thermal characteristics to land use conversions has become an issue for geographers and meteorologists and the impact on temperature is the key concern. This paper analyzed the influence of farmland expansion on temperature in an agricultural area in Sanjiang plain. Using two images of moderate-resolution imaging spectroradiometer（MODIS）, the spatial information of regional land use in 2001 and 2008 were acquired. The Mesoscale model 5（MM5） was applied to downscale the data of temperature with the height of 2 meters derived from the final operational global analysis（FNL） data and to obtain monthly mean temperature of corresponding periods with a lower resolution. The results revealed that there was an obvious difference between monthly mean temperature in 2001 and 2008. The expansion of farmland and the conversion of cereal crop and broadleaf crop were the major patterns of land use variations in the past 8 years. Converting other types of land use to cereal crop and broadleaf crop resulted in temperature declining. The conversions of deciduous broadleaf trees to these two crops caused more intensive decline in temperature. Reclaiming forest land for farmland and shifting dry farm to paddy field both led to the temperature rising. The study demonstrated that spatial distribution of temperature in the agricultural area was influenced by farmland expansion. |
