中国地理科学 ›› 2014, Vol. 0 ›› Issue (2): 205-219.doi: 10.1007/s11769-013-0637-2

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

YAN Huimin1, XIAO Xiangming2, HUANG Heqing1, LIU Jiyuan1, CHEN Jingqing1, BAI Xuehong1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    2. Department of Botany and Microbiology, Center for Spatial Analysis, University of Oklahoma, Norman, Oklahoma 73019-5300, USA
  • 收稿日期:2012-09-12 修回日期:2012-12-17 出版日期:2014-01-27 发布日期:2014-01-28
  • 通讯作者: YAN Huimin,yanhm@igsnrr.ac.cn E-mail:yanhm@igsnrr.ac.cn
  • 基金资助:

    Under the auspices of Strategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues of Chinese Academy of Sciences (No. XDA05050602), Major State Basic Research Development Program of China (No. 2010CB950904), National Natural Science Foundation of China (No. 40921140410, 41071344), Land Cover and Land Use Change Program of National Aeronautics and Space Administration, USA (No. NAG5-11160, NNG05GH80G)

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

YAN Huimin1, XIAO Xiangming2, HUANG Heqing1, LIU Jiyuan1, CHEN Jingqing1, BAI Xuehong1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    2. Department of Botany and Microbiology, Center for Spatial Analysis, University of Oklahoma, Norman, Oklahoma 73019-5300, USA
  • Received:2012-09-12 Revised:2012-12-17 Online:2014-01-27 Published:2014-01-28

摘要:

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 double- and triple-cropping practices. The 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)

Abstract:

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 double- and triple-cropping practices. The resultant multiple cropping map could be used to evaluate the impacts of agricultural intensification on biogeochemical cycles.

Key words: agricultural intensification, multiple-cropping, crop calendar, agro-meteorological observation, moderate resolution imaging spectroradiometer (MODIS)