Panuska,J.C. and Karthikeyan,K.G.(2010): Phosphorus and organic matter enrichment in snowmelt and rainfall-runoff from three corn management systems. Geoderma, 154, 253-260.

『３つのトウモロコシ管理システムからの融雪水および降水源流水の中のリンと有機物の濃集』

『Abstract
　The physical nature of sediment transport favors the movement of smaller and less dense materials, typically resulting in greater (enriched) sediment total phosphorus (TP) and organic matter (OM) concentrations than those of the parent soil. In rainfall-runoff, residue cover significantly influenced P enrichment, with the median TP enrichment ratio (TPER) for corn-grain (1.4) being significantly greater (p=0.007) than that for corn-silage (0.8) and manured corn-silage (1.0) fields, which were similar. While greater P enrichment was observed in snowmelt compared to rainfall-runoff, attributable to correspondingly high OMER values, TPER was unaffected by treatment differences (p=0.60). The OM enrichment was much higher (〜10×) during snowmelt (9.7) compared to rainfall-runoff (0.97). Low flow rates over frozen surfaces may have favored enhanced transport of OM and clay-sized particles in snowmelt. Crop residue contributions from corn-grain systems favor greater transport of organic P forms (i.e., low dissolved reactive P/total dissolved P ratios) whereas inorganic P dominance was observed in silage fields. Additional intra-event runoff data generated for fields with different crop-row orientations (contour vs. up-and-down the slope) provided more insights into the temporal dynamics of P enrichment process. The TPER values were generally inversely related to flow rate and soil loss. This study addresses crucial knowledge/information gaps on the role played by the mode of runoff generation (rainfall-runoff vs. snowmelt) and field roughness conditions (due to crop residue, crop-row orientation) on P enrichment from row-cropped agricultural systems.

Keywords: Soil erosion; Sediments; Enrichment; Total phosphorus; Organic matter; Surface crusting』

1. Introduction
2. Materials and methods
　2.1. Field sites and instrumentation
　2.2. Land management
　2.3. Sample collection and analysis
　　2.3.1. Bulk sampling
　　2.3.2. Intra-event continuous sampling
　　2.3.3. Statistical analysis
3. Results and discussion
　3.1. Precipitation data
　3.2. Site soil data
　3.3. Bulk-sampled runoff
　　3.3.1. TP enrichment
　　3.3.2. OM enrichment
　3.4. Organic matter type and runoff P form
　3.5. Intra-event rainfall-runoff and P enrichment
4. Conclusions
Nomenclature
Acknowledgments
References

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