黄土高原不同土地覆盖类型下生物指标的时空变化分析

摘要

地表土地覆盖情况在人类影响气候变化的途径中具有重要影响。结合MODIS生物指标和土地覆盖类型数据，对2000～2014年黄土高原地区不同土地覆盖类型下生物指标的变化特征进行了分析。结果表明：黄土高原地区近15年生物参数呈上升趋势，且林地和草地类型对这一结果贡献率更高，而稀疏灌木林的贡献率最低。“退耕还林／草”政策的实施，促进了黄土高原地区生物指标的提升，彰显了该政策实施所产生的良好成效。然而也应该加强稀疏灌木林地区地表的水土保持力度是以后的工作重点。%Land cover plays an important role in human being ’ s impact on the climatic change .Based on the data of MODIS biological indexes and land cover type, the change characteristics of biological indexes under different land cover types in the Lo-ess Plateau region during 2000~2014 were analyzed.The results showed that the biological parameters of the Loess Plateau had an upward trend in recent 15 years, and forest land and grassland had a higher contribution rate to this result, while sparse shrub forest had the lowest contribution rate to it .The implementation of policy “returning farmland to forest land and grassland” promo-ted the rising of biological indexes in the region of Loess Plateau, indicating that the policy implementation produced a good result. In the future, the water and soil conservation intensity in sparse shrub forest region should be strengthened too .