| 基于3S技术的甘南草地覆盖度动态变化研究 |
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| 引用本文： | 王浩,李文龙,杜国祯,朱晓丽. 基于3S技术的甘南草地覆盖度动态变化研究[J]. 草业学报, 2012, 21(3): 26-37. DOI: 10.11686/cyxb20120304 |
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| 作者姓名： | 王浩 李文龙 杜国祯 朱晓丽 |
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| 作者单位： | 1.兰州大学草地农业科技学院 草地农业生态系统国家重点实验室,甘肃 兰州 730020; 2.兰州大学干旱与草地生态教育部重点实验室,甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金，中央高校基本科研业务专项基金，国家教育部博士点基金，教育部"春晖计划"，国家科技部科技支撑重点项目 |
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| 摘 要： | 以像元二分法模型为基础,构建了基于改进归一化植被指数(NDVI)的植被覆盖度定量估算模型,并利用MODIS卫星遥感数据,基于3S技术(GIS,RS,GPS)空间分析功能,分级计算得到了甘南2002,2004,2006,2008年的草地植被覆盖度,分析了甘南2002-2008年植被覆盖度变化的空间动态演变过程和趋势。结果表明,2002-2008年,甘南植被覆盖度质量总体呈下降趋势,一级盖度植被的退化比较严重,草地植被的演变情况主要由优等植被覆盖(一、二级)向低等植被覆盖(四、五级)演变。研究结果揭示了甘南州草地退化状况日趋严重的事实,为相关研究和政府草地管理提供了有效依据。
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| 关 键 词： | 草地植被覆盖度 NDVI MODIS 3S技术 |
Research on the change of grassland vegetation coverage using 3S technology in Gannan |
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| WANG Hao , LI Wen-long , DU Guo-zhen , ZHU Xiao-li. Research on the change of grassland vegetation coverage using 3S technology in Gannan[J]. Acta Prataculturae Sinica, 2012, 21(3): 26-37. DOI: 10.11686/cyxb20120304 |
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| Authors: | WANG Hao LI Wen-long DU Guo-zhen ZHU Xiao-li |
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| Affiliation: | 1.State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China; 2.Key Laboratory of Arid and Grassland Ecology of Ministry of Education, Lanzhou University, Lanzhou 730000, China) |
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| Abstract: | Using the dimidiate pixel model and 3S technique(GIS,RS,GPS),a new vegetation coverage analyze model was built on the basis of the NDVI vegetation index.The vegetation coverage was estimated in Gannan state in 2002,2004,2006 and 2008 with MODIS data and the characteristics of the vegetation coverage dynamics was analysed.From 2002 to 2008,the deterioration of rangeland vegetation coverage in Gannan was general,and the degradation level of the first stage vegetation was high.The change in grassland vegetation cover reflected the trend of conversion from high-stage(the 1st and 2nd stage) to low-stage(the 4th and 5th stage) coverages.It further confirmed that the grassland vegetation in Gannan area is progressively degrading more seriously.The result will be useful for further academic research and rangeland management. |
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| Keywords: | rangeland vegetation coverage NDVI MODIS 3S technology |
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