Characterizing Spatial Patterns of Phenology in Cropland of China Based on Remotely Sensed Data

查看全文 作　　者：WU Wen-[1]bin;YANG [1]Peng;TANG Hua-[1]jun;ZHOU Qing-[1]bo;CHEN Zhong-[1]xin;Ryosuke [2]Shibasaki

机构地区：[1]Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Resources Remote Sensing and Digital Agriculture, Ministry of Agriculture, Beijing 100081, P.R.China;[2]Center for Spatial Information Science, University of Tokyo, Tokyo 153-8505, Japan

出　　处：《Agricultural Sciences in China》索引2010年第9卷第1期,共12页

基　　金：supported by the National Natural Science Foundation of China (40930101,40971218);the 948 Program,Ministry of Agriculture of China (2009-Z31);the Foundation for National Non-Profit Scientific Institution,Ministry of Finance of China (IARRP-2010-2) 摘　　要：This study used time-series of global inventory modeling and mapping studies(GIMMS) normalized difference vegetation index(NDVI) datasets at a spatial resolution of 8 km and 15-d interval to investigate the spatial patterns of cropland phenology in China.A smoothing algorithm based on an asymmetric Gaussian function was first performed on NDVI dataset to minimize the effects of anomalous values caused by atmospheric haze and cloud contamination.Subsequent processing for identifying cropping systems and extracting phenological parameters,the starting date of growing season(SGS) and the ending date of growing season(EGS) was based on the smoothed NVDI time-series data.The results showed that the cropping systems in China became complex as moving from north to south of China.Under these cropping systems,the SGS and EGS for the first growing season varied largely over space,and those regions with multiple cropping systems generally presented a significant advanced SGS and EGS than the regions with single cropping patterns.On the contrary,the phenological events of the second growing season including both the SGS and EGS showed little difference between regions.The spatial patterns of cropping systems and phenology in Chinese cropland were highly related to the geophysical environmental factors.Several anthropogenic factors,such as crop variety,cultivation levels,irrigation,and fertilizers,could profoundly influence crop phenological status.How to discriminate the impacts of biophysical forces and anthropogenic drivers on phenological events of cultivation remains a great challenge for further studies. 关键词：中国南方空间格局物候学遥感数据时间序列数据归一化植被指数农作物品种种植系统

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Characterizing Spatial Patterns of Phenology in Cropland of China Based on Remotely Sensed Data

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