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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6. 海南岛农牧生产体系磷素循环量(A)和利用率(B)变化 | 
| Fig. 6. Changes of phosphorus circulation quantity (A) and use efficiency (B) in the crop-livestock production system of Hainan Island | 
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