Journal of Geo-information Science >
Spatiotemporal Dynamic Analysis of MODIS LAI Reconstructed in Different Cultivation Areas in China from 2001 to 2017
Received date: 2020-04-15
Request revised date: 2020-06-09
Online published: 2021-06-25
Supported by
National Key Research and Development Plan of China(2018YFC1506602)
Key Program of National Natural Science Foundation of China(91437220)
Copyright
Leaf Area Index (LAI), one of the vegetation biomass indicators, not only change with growth of crops, but also closely related to agroecology and crop yield in cultivation areas. In this study, the long time series of MODIS-LAI data were reconstructed in China's cultivation areas from 2001 to 2017. The spatial and temporal changes of LAI were further analyzed by Mann-Kendall test, coefficient of variation, and gravity center migration model. The results show that LAI significantly increased wavelike from 2001 to 2017 in cultivation areas of China. The correlation coefficient between LAI and crop yield was as high as 0.91. There were significant differences in mean LAI between different seasons, with summer (1.54) > autumn (0.78)> spring (0.63) > winter (0.31) and an average of 1.13 for the growing season. LAI changed little from 2001 to 2012 in the double and triple cropping regions but showed an increase trend after 2012. It was very different that LAI in the single cropping region showed a steady increase before 2006 and an abrupt increase after 2006. The coefficient of variation of LAI was large in cultivation areas in the north of the Yangtze River in China with a maximum of 4.12. Moreover, the gravity center of cultivation areas first migrated forward southwest and then forward northwest. The migration range of LAI gravity center during farmland growth season was larger than that of cultivation area. It migrated to the west after the north-south transfer, with a migration distance of 82.78 km and 90.53 km, respectively.
WANG Yuqi , SHEN Runping , HUANG Anqi , ZHOU Minyue . Spatiotemporal Dynamic Analysis of MODIS LAI Reconstructed in Different Cultivation Areas in China from 2001 to 2017[J]. Journal of Geo-information Science, 2021 , 23(4) : 658 -669 . DOI: 10.12082/dqxxkx.2021.200182
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