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multiple cropping Intensity in China Derived from Agro-meteorological Observations and MODIS Data

Chinese Geographical Science 2014年第2期24卷 205-219页

作者： YAN Huimin XIAO Xiangming HUANG Heqing LIU Jiyuan CHEN Jingqing BAI Xuehong Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Department of Botany and Microbiology Center for Spatial AnalysisUniversity of Oklahoma

Double-and triple-cropping in a year have played a very important role in meeting the rising need for food in ***,the intensified agricultural practices have significantly altered biogeochemical cycles and soil *** 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 *** 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 *** 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 *** to the MODIS-derived multiple cropping distribution in 2002,the proportion of cropland cultivated with multiple crops reached 34%in ***-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 double-and triple-cropping *** resultant multiple cropping map could be used to evaluate the impacts of agricultural intensification on biogeochemical cycles.

关键词： agricultural intensification multiple-cropping crop calendar agro-meteorological observation moderate resolution imaging spectroradiometer(MODIS)

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