| Evaluation of drought monitoring effects in the main growth and development stages of winter wheat using vegetation temperature condition index Ⅲ.——Impact evaluation of drought on wheat yield |
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| DOI：10.7606/j.issn.1000-7601.2014.05.037 |
| Key Words: vegetation temperature condition index normalized combination approach yield drought impact evaluation |
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| Abstract: |
| Selected the drought monitoring results of remote sensing by the vegetation temperature condition index (VTCI) for winter wheat after the winter at the ten-day intervals from March to May of the years from 2002 to 2009 in the Guanzhong Plain, the optimal weights of drought impact on wheat yield at the 4 main stages were determined based on the normalized combination approach. A linear re
gression model of annual VTCI with wheat yield was established for the four cities in the Guanzhong Plain (except Tongchuan City) and estimated the yield of the winter wheat. The results showed that: The winter wheat yield presented a rising trend with fluctuation in whole Guanzhong Plain from 2002 to 2009, the yield in middle of the plain was the highest, the yield in the west plain was the secon
d and the east plain was the lowest. Based on the whole yield estimating model of the four cities in the Guanzong Plain to forecast the yields on parts counties and districts of Xi'an City in 2010, has obtained rather good results, validated the whole yield estimating model with rather good accuracy, can be accurately reflected the impact of drought on the wheat yield in the Guanzhong Plain. |
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