| .基于MODIS的三江平原农业扩张对农区气温的影响[J].农业环境科学学报,2013,32(5):. |
| 基于MODIS的三江平原农业扩张对农区气温的影响 |
| The Influence of Farmland Expansion Using MODIS Data on Temperature in an Agricultural Area of Sanjiang Plain |
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| DOI：10.11654/jaes.2013.05.023 |
| 中文关键词: 气温 农田扩张 土地利用 MODIS MM5 灌溉 |
| 英文关键词: temperature farmland expansion land use MODIS MM5 irrigation |
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| 摘要点击次数: 1942 |
| 全文下载次数: 2298 |
| 中文摘要: |
| 土地利用变化所引起的地表水热特征变化已成为地理学家与气象学家共同关注的焦点问题，其中包括土地利用变化对气温的影响。以中分辨率成像光谱仪（Moderate-resolution Imaging Spectroradiometer，简称MODIS）的遥感影像为数据源，获取了挠力河中游2001年和2008年的土地利用数据；利用中尺度气象模式（Mesoscale Model 5, 简称MM5）对这一时期全球分析资料（Final Operational Global Analysis，简称FNL资料）来源的2 m气温数据进行了降尺度处理，据此分析了土地利用变化与农区气温之间的关系。结果表明：（1）过去8年间，研究区内最为明显的土地利用变化方向是农田的扩张和种植结构的调整；（2）2001年和2008年各土地利用类型的月平均气温差异显著；（3）各种土地类型转变为谷类作物和阔叶作物，气温均有所上升，其中“落叶阔叶林转变为谷类作物”和“落叶阔叶林转变为阔叶作物”气温上升幅度最大。研究结果说明农田扩张影响了农区气温，林地开垦为农田以及“旱改水”导致气温上升。 |
| 英文摘要: |
| 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. |
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