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		海南岛农牧生产体系磷元素流动时空变化特征
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			Temporal and Spatial Variation Characteristics of Phosphorus Element Flows in the Crop-Livestock Production System of Hainan Island
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| 图1. 农牧生产体系磷素流动模型 | 
| Fig. 1. Schematic diagram of phosphorus flows model in the crop-livestock production system | 
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