| 鄱阳湖区2004-2010年水稻种植制度时空变化(英文) |
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| 引用本文： | 李鹏,封志明,姜鲁光,刘煜杰,肖向明.鄱阳湖区2004-2010年水稻种植制度时空变化(英文)[J].地理学报(英文版),2012,22(4):653-668. |
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| 作者姓名： | 李鹏 封志明 姜鲁光 刘煜杰 肖向明 |
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| 作者单位： | Institute of Geographic Sciences and Natural Resources Research,CAS;Graduate University of Chinese Academy of Sciences;Department of Botany and Microbiology,Center for Spatial Analysis,University of Oklahoma |
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| 基金项目： | National Basic Research Program of China(973 Program),No.2009CB421106;National Natural Science Foundation of China,No.40901285 |
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| 摘 要： | Rice cropping systems not only characterize comprehensive utilization intensity of agricultural resources but also serve as the basis to enhance the provision services of agro-ecosystems.Yet,it is always affected by external factors,like agricultural policies.Since 2004,seven consecutive No.1 Central Documents issued by the Central Government have focused on agricultural development in China.So far,few studies have investigated the ef-fects of these policies on the rice cropping systems.In this study,based upon the long-term field survey information on paddy rice fields,we proposed a method to discriminate the rice cropping systems with Landsat data and quantified the spatial variations of rice cropping systems in the Poyang Lake Region(PLR),China.The results revealed that:(1) from 2004 to 2010,the decrement of paddy rice field was 46.76 km2 due to the land use change.(2) The temporal dynamics of NDVI derived from Landsat historical images could well characterize the temporal development of paddy rice fields.NDVI curves of single cropping rice fields showed one peak,while NDVI curves of double cropping rice fields displayed two peaks an-nually.NDVI of fallow field fluctuated between 0.15 and 0.40.NDVI of the flooded field during the transplanting period was relatively low,about 0.20±0.05,while NDVI during the period of panicle initiation to heading reached the highest level(above 0.80).Then,several temporal windows were determined based upon the NDVI variations of different rice cropping systems.(3) With the spatial pattern of paddy rice field and the NDVI threshold within optimum tem-poral windows,the spatial variation of rice cropping systems was very obvious,with an in-creased multiple cropping index of rice about 20.2% from 2004 to 2010.The result indicates that agricultural policies have greatly enhanced the food provision services in the PLR,China.
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| 关 键 词： | rice cropping systems NDVI temporal windows threshold method Landsat the Poyang Lake region(PLR) |
| 收稿时间： | 2011-09-28 |
Changes in rice cropping systems in the Poyang Lake Region,China during 2004-2010 |
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| LI Peng
,
FENG Zhiming
,
JIANG Luguang
,
LIU Yujie
,
XIAO Xiangming.Changes in rice cropping systems in the Poyang Lake Region,China during 2004-2010[J].Journal of Geographical Sciences,2012,22(4):653-668. |
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| Authors: | LI Peng FENG Zhiming JIANG Luguang LIU Yujie XIAO Xiangming |
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| Institution: | 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3. Department of Botany and Microbiology, Center for Spatial Analysis, University of Oklahoma, Norman 73019, OK, USA |
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| Abstract: | Rice cropping systems not only characterize comprehensive utilization intensity of agricultural resources but also serve as the basis to enhance the provision services of agro-ecosystems.Yet,it is always affected by external factors,like agricultural policies.Since 2004,seven consecutive No.1 Central Documents issued by the Central Government have focused on agricultural development in China.So far,few studies have investigated the ef-fects of these policies on the rice cropping systems.In this study,based upon the long-term field survey information on paddy rice fields,we proposed a method to discriminate the rice cropping systems with Landsat data and quantified the spatial variations of rice cropping systems in the Poyang Lake Region(PLR),China.The results revealed that:(1) from 2004 to 2010,the decrement of paddy rice field was 46.76 km2 due to the land use change.(2) The temporal dynamics of NDVI derived from Landsat historical images could well characterize the temporal development of paddy rice fields.NDVI curves of single cropping rice fields showed one peak,while NDVI curves of double cropping rice fields displayed two peaks an-nually.NDVI of fallow field fluctuated between 0.15 and 0.40.NDVI of the flooded field during the transplanting period was relatively low,about 0.20±0.05,while NDVI during the period of panicle initiation to heading reached the highest level(above 0.80).Then,several temporal windows were determined based upon the NDVI variations of different rice cropping systems.(3) With the spatial pattern of paddy rice field and the NDVI threshold within optimum tem-poral windows,the spatial variation of rice cropping systems was very obvious,with an in-creased multiple cropping index of rice about 20.2% from 2004 to 2010.The result indicates that agricultural policies have greatly enhanced the food provision services in the PLR,China. |
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| Keywords: | rice cropping systems NDVI temporal windows threshold method Landsat the Poyang Lake region(PLR) |
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