1. Institute of Agriculture Sustainable Development, Shandong Academy of Agriculture Sciences, Ji’nan 250100, China; 2. Key Laboratory of East China Urban Agriculture, Ministry of Agriculture, Ji’nan 250100, China;
Crop growth condition monitoring is one of the key contents of crop monitoring. The growth condition of different periods is obviously different especially in a large region because of phenology. In order to improve the accuracy of the research on crop monitoring in the large region and long time series, the authors extracted heading dates of winter wheat in Shandong Province from 2001 to 2015 based on MOD09A1 datasets and then analyzed the spatio-temporal changes of the condition during the heading period of winter wheat. The main conclusions are as follows: ① Heading dates from EVI have a better consistency with ground observation data than results of NDVI. ② Heading stage is mainly concentrated in mid-April to late-April and gradually postponed from south to north, and so is the situation from west to east. ③ Compared with other four indexes, PI_NDVI gets a better resultant index for monitoring the actual growth conditions of winter wheat in the study area. ④ Founded on the results of PI_NDVI, irrigation condition of winter wheat during the heading stage was on the rise from 2001 to 2015. However, interannual fluctuation was obvious. Conditions of winter wheat exhibited an obvious difference in different areas of the same year. However, the growing conditions are consistent in most of the study region, close to the average level of 15 years. The results in this paper are concordant with the records of situ measurement and previous researches in the same area, and this indicates that the research thinking in this paper can provide certain references for the study of crop condition using remote sensing.
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2018, Vol. 30 
), 隋学艳1,2, 姚慧敏1,2, 梁守真1,2, 王猛1,2
