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气象:2010,36(12):109-115
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退耕前后吴起地区土地利用变化对温度的影响
(1.陕西省延安市气象局, 延安 716000;2.甘肃省庆阳市气象局, 庆阳 745000)
The Impact of Land Use Change on Temperature as Revealed by Satellite Images of Wuqi, Shaanxi Province
(1.Yan’an Meteorological Office of Shaanxi Province, Yan’an 716000;2.Qingyang Meteorological Office of Gansu Province, Qingyang 745000)
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投稿时间:2009-08-20    修订日期:2010-02-10
中文摘要: 利用TM遥感影像解译土地利用状况、植被覆盖度,研究退耕还林前后的土地利用、植被覆盖度的变化,揭示陕西省吴起县退耕还林生态建设工程所取得的实效;利用吴起与周边6个气象站37年的气温和地温资料,分析吴起土地覆盖变化后对温度的影响。结果表明,随着退耕还林工程的实施,吴起县域版图在遥感影像逐渐显现、越来越清晰,植被覆盖增加极为显著,高覆盖植被面积在逐年增加,低覆盖植被面积在逐年减少,植被恢复情况明显好于周围区域。与1997年相比,到2007年吴起县有75.15%耕地不再耕种,退出的耕地主要变为草地、林地和果园;林草覆盖率增加显著,由1997年的37.06%提高到2007年的80.60%。植被覆盖变化后,对地温和气温均产生了影响,变暖趋势得到下降,对夏季的影响大于冬季,夜间的影响大于白天。
Abstract:To study changes of land use status and vegetation coverage pre and post returning farmland to forest, the TM remote sensing images were interpreted, revealing the practical effectiveness for ecological construction project of Wuqi County, Shaanxi Province by returning farmland to forestry. Based on the air temperature and soil temperature 37 year data at 6 meteorological stations surrounding Wuqi County, the effects of the land cover change on temperature in this area have been analyzed. The results showed that Wuqi County layout appears gradually, and has become increasingly clear with the implementation of the project of returning farmland to forest. Meanwhile, the vegetation coverage increases significantly, the high vegetation coverage area is increasing year by year, the low vegetation coverage area is just decreasing, and the vegetation restoration is significantly better than the surrounding area. Compared with 1997, the 75.15% of arable land is no longer farmed by 2007, the withdrawal of the main arable land turns into grassland, woodland and orchards; and the vegetation coverage has increased significantly, from 37.06% in 1997 to 80.60% in 2007. There has an impact on the air temperature and soil temperature after vegetation cover changes, warming trend is declining, the impact of the summer is greater than in winter, and the night time than during the day.
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基金项目:延安市科学技术研究发展计划项目(2007Z-10)资助
引用文本:
孙智辉,雷延鹏,任继帮,曹雪梅,刘志超,2010.退耕前后吴起地区土地利用变化对温度的影响[J].气象,36(12):109-115.
SUN Zhihui,LEI Yanpeng,REN Jibang,CAO Xuemei,LIU Zhichao,2010.The Impact of Land Use Change on Temperature as Revealed by Satellite Images of Wuqi, Shaanxi Province[J].Meteor Mon,36(12):109-115.