The Ayeyarwady Delta in the Bay of Bengal, the rice bowl of Myanmar, depends on natural conditions, especially rainfall. During the dry season, the delta’s coastal zone experiences saline water intrusion due to its low-lying topography. On May 2, 2008, Cyclone Nargis made landfall and crossed Ayeyarwady Region and Yangon City, affecting more than 50 townships and causing massive destruction of personal property and natural ecosystems. There is no doubt that Nargis caused an unprecedented large-scale disaster, but there is no objective method to quantify crop yield and salinity damage in the delta post-Nargis. The purpose of this study, therefore, is to clarify the changes in vegetation in paddy fields in the Ayeyarwady Delta using Moderate Resolution Imaging Spectroradiometer data pre- and post-Nargis and determine whether this method can be applied to measure crop and salinity damage. The study used daily composite data at a 250-m resolution (MOD09GQ, collection 6) from 2004 to 2013 and calculated NDVI and salinity indices smoothed by locally weighted regression (Lowess). Based on the results of our studies, NDVI peak value in 2008 was lower by 19% compared to 2007 data, and that the NDVI peak values declined for three straight years since May 2008 when Nargis struck. However, salinity damage evaluation pre- and post-Nargis (using the salinity index equation) showed that soil electrical conductivity did not tend to move up in the post-Nargis dry season (2009), indicating that the decrease in NDVI values was not due to salinity damage.

缅甸的饭碗孟加拉湾的伊洛瓦底三角洲取决于自然条件，尤其是降雨。在干旱季节，三角洲的沿海地区由于地势低洼而遭受盐水入侵。2008年5月2日，纳尔吉斯飓风登陆并越过伊洛瓦底地区和仰光市，影响了50多个城镇，并严重破坏了个人财产和自然生态系统。毫无疑问，纳尔吉斯造成了史无前例的大规模灾难，但没有客观的方法来量化纳尔吉斯峰后三角洲的农作物产量和盐分损害。因此，本研究的目的是 旨在使用纳尔吉斯前后的中分辨率成像分光光度计数据澄清伊洛瓦底江三角洲稻田中植被的变化，并确定该方法是否可用于测量农作物和盐碱度损害。该研究使用了2004年至2013年每日250 m分辨率的复合数据（MOD09GQ，集合6），并计算了NDVI和盐度指数，并通过局部加权回归（Lowess）进行了平滑处理。根据我们的研究结果，2008年的NDVI峰值比2007年的数据低了19％，并且自2008年5月纳尔吉斯发生以来，NDVI的峰值连续三年下降。然而，纳尔吉斯峰前后的盐渍破坏评估（使用盐度指数方程式）显示，在纳尔吉斯峰后的干旱季节（2009年），土壤电导率没有上升的趋势，