基于SPOT-NDVI的川西平原水稻生育期监测分析

The Monitoring Analysis of Paddy Rice Growing Periods in the Western Sichuan Plain Based on SPOT-NDVI

为了更好的监测川西平原农区水稻长势情况，深入了解水稻各生育期生长状态差别，利用2001—2010年SPOTNDVI的旬合成资料序列，分析了川西平原水稻生育期长势与NDVI的关系。结果表明：水稻各生育期与NDVI有很好的对应关系。水稻返青期植被指数在0．5～0．6之间；分蘖一拔节期水稻NDVI指数达到峰值，在0．7～0．8之间；抽穗扬花期水稻NDVI指数有所下降，在0．6左右；进入乳熟成熟期后，水稻植被指数迅速降低到0．4以下。由此得出，SPOTNDVI资料能够较为准确地反映川西平原稻区的水稻生育期和不同生育期水稻的长势情况，该资料可以用来作为监测川西平原农区水稻长势情况的重要数据之一。

The satellite data have been used to monitor the growth status of paddy rice. Because of the complex climate features, whether the method can be applied in Sichuan Basin remains unclear. In this study, the authors investigate the growth status of paddy rice in the western Sichuan plain by using composed ten-day NDVI sequence of SPOT data from 2001 to 2010. The results showed that, the seasonal variation of NDVI sequence of SPOT could accurately reflect the growing periods and the growth status of paddy rice in the western Sichuan plain： each growing period of paddy rice is corresponding to a certain NDVI value. The NDVI value was between 0.5 and 0.6 during the period of paddy rice reviving. The NDVI value reached its peak from the tillering period to stem extension period of paddy rice, up to 0.7-0.8. In booting NDVI declined to 0.6. After that, it decreased rapidly, and was less than 0.4 periods. Based on the results, it could be concluded that, the SPOT NDVI data paddy rice in the western Sichuan plain, and could use as one of potential growth status of paddy rice. and sprouting during the milkripe could depict the data sources for periods, the and mature growth status of monitoring the