2000—2015年中国土地荒漠化连续遥感监测及其变化

以植被覆盖度作为荒漠化评价的指标,利用2000—2015年序列影像计算的年均植被覆盖度和气温、降水等数据,分析不同地区荒漠多年间荒漠化动态的变化过程、自然因素对土地荒漠化动态的影响以及人类活动对土地荒漠化的贡献。结果表明:我国土地荒漠化呈整体得到初步遏制,荒漠化土地持续减少,但局部地区呈扩大的趋势;全国大部分地区气象因子未发生显著变化,西藏东部和云南山区气温上升和降水下降对土地荒漠化起到了促进作用;国家的政策和人工造林、退耕还林和保护天然林等重大工程对遏制我国土地荒漠化具有重要作用。

Continuous Remote Sensing Monitoring and Changes of Land Desertification in China from 2000 to 2015

Using vegetation coverage as the main indicator for desertification evaluation,the annual average vegetation cover,temperature,precipitation and other data were calculated with the 2000-2015 serial images to analyze the dynamic change process of deserts and the effects of natural factors on land desertification dynamics in different regions over many years.The afforestation and other desertification prevention projects were combined to analyze the contribution of human activities to land desertification.Our results show that China’s land desertification has been initially contained overall,desertification land continues to decrease,and some areas are still expanding,and the area of desertification land has continued to decrease.Meteorological factors have not changed significantly in most parts of the country.The decline in rainfall has played a role in promoting desertification.National policies and major projects such as artificial afforestation,returning farmland to forests,and protecting natural forests have made major contributions to curbing land desertification in China.