Multiple Cropping Intensity in China Derived from Agro-meteorological Observations and MODIS Data

Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in China. However,the intensified agricultural practices have significantly altered biogeochemical cycles and soil quality. Understanding and mapping cropping intensity in China′s agricultural...

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Bibliographic Details
Published in:	Chinese geographical science 2014-04, Vol.24 (2), p.205-219
Main Authors:	Yan, Huimin, Xiao, Xiangming, Huang, Heqing, Liu, Jiyuan, Chen, Jingqing, Bai, Xuehong
Format:	Article
Language:	eng
Subjects:	agroecosystems Agroforestry algorithms biogeochemical cycles carbon cropland Crops Data analysis double cropping Earth and Environmental Science Geography Meteorology moderate resolution imaging spectroradiometer MODIS multiple cropping nitrogen soil quality time series analysis vegetation 中分辨率成像光谱仪中国农业气象观测复种强度数据导出生物地球化学循环
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Summary:	Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in China. However,the intensified agricultural practices have significantly altered biogeochemical cycles and soil quality. Understanding and mapping cropping intensity in China′s agricultural systems are therefore necessary to better estimate carbon,nitrogen and water fluxes within agro-ecosystems on the national scale. In this study,we investigated the spatial pattern of crop calendar and multiple cropping rotations in China using phenological records from 394 agro-meteorological stations（AMSs） across China. The results from the analysis of in situ field observations were used to develop a new algorithm that identifies the spatial distribution of multiple cropping in China from moderate resolution imaging spectroradiometer（MODIS） time series data with a 500 m spatial resolution and an 8-day temporal resolution. According to the MODIS-derived multiple cropping distribution in 2002,the proportion of cropland cultivated with multiple crops reached 34% in China. Double-cropping accounted for approximately 94.6% and triple-cropping for 5.4%. The results demonstrat that MODIS EVI（Enhanced Vegetation Index） time series data have the capability and potential to delineate the dynamics of doubleand triple-cropping practices. The resultant multiple cropping map could be used to evaluate the impacts of agricultural intensification on biogeochemical cycles.
ISSN:	1002-0063 1993-064X