Changes in rice cropping systems in the Poyang Lake Region, China during 2004-2010
文献类型：SCI/SSCI论文
| 作者 | Li P. ; Feng Z. M.; Jiang L. G.; Liu Y. J.; Xiao X. M.
|
| 发表日期 | 2012 |
| 关键词 | Rice Cropping Systems Ndvi Temporal Windows Threshold Method Landsat The Poyang Lake Region (Plr) Multitemporal Modis Images Mekong Delta Land-use Vegetation Agriculture Cropland Fields South Site Area |
| 英文摘要 | 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 effects 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 km(2) 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 annually. 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 temporal windows, the spatial variation of rice cropping systems was very obvious, with an increased 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. |
| 出处 | Journal of Geographical Sciences |
| 卷 | 22 |
| 期 | 4 |
| 页 | 653-668 |
| 语种 | 英语 |
| ISSN号 | 1009-637X |
| 源URL | [http://192.168.22.105/handle/311030/26874]  |
| 专题 | 资源利用与环境修复重点实验室_外文论文 陆地表层格局与模拟院重点实验室_外文论文 |
| 推荐引用方式 GB/T 7714 | Li P.,Feng Z. M.,Jiang L. G.,et al. Changes in rice cropping systems in the Poyang Lake Region, China during 2004-2010. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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