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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Soil phosphorus spatial variability due to landform, tillage, and input management: A case study of small watersheds in southwestern Manitoba
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Soil phosphorus spatial variability due to landform, tillage, and input management: A case study of small watersheds in southwestern Manitoba

机译：地形，耕作和投入管理导致的土壤磷空间变异性：以马尼托巴西南部的小流域为例

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Understanding spatial patterns of soil phosphorus is critical for efficient nutrient management and for the design of soil sampling in agricultural watersheds. This study describes patterns of soil test phosphorus (Olsen-P) concentration and variability for undulating/dissected agricultural landscapes in southwestern Manitoba under a range of management systems (no-input organic, organic with manure application, no-till, fertilized and tilled). Sampling occurred at 504 locations located in 16 small watersheds draining eight different fields. At a regional scale, most variance in Olsen-P for the 0-15 cm depth was associated with differences among fields (0.344 [log (mg kg(-1))](2), 47%). However, significant variance (0.263 [log (mg kg(-1))](2), 36%) was associated with differences among sampling plots within each field. Olsen-P for the 15-60 cm depth was lower and variance was more strongly associated with differences in field. Among-field differences in Olsen-P for 0-15 cm were strongly associated with management. Elevated Olsen-P was observed for fields that historically received application of fertilizer or manure in combination with tillage and lower Olsen-P was observed for low input organic and no-till fields. For six of eight fields sampled, a high proportion of variance in Olsen-P at the 0-15 cm depth was predicted by the Topographic Wetness Index (TWI) (r(2) = 0.46-0.96, p 0.01), with better predictive ability observed in low input and no-till fields. Despite differences in this relationship associated with management history, a significant positive correlation with TWI was observed among all sampling plots (r(2) = 025, p 0.0001, n = 56). The tendency toward P accumulation in low lying areas highlights the potential to reduce input rates in these locations for a variety of farm management systems practiced on the glacially formed landscapes of the Canadian prairies, but the need to develop management system specific recommendations for targeted application are also illustrated in this case study. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.
机译：了解土壤磷的空间格局对于有效的养分管理和农业流域土壤采样设计至关重要。这项研究描述了在一系列管理系统（无输入有机肥，有机肥，免耕，施肥和耕作）下一系列管理体系下西南部马尼托巴省土壤测试磷（Olsen-P）的浓度模式和波动/解剖农业景观的变异性。 。采样发生在位于16个小流域的504个位置，排水了8个不同的油田。在区域尺度上，Olsen-P在0-15厘米深度处的最大差异与田间差异有关（0.344 [log（mg kg（-1））]（2），47％）。但是，显着差异（0.263 [log（mg kg（-1））]（2），36％）与每个字段内采样图之间的差异相关。 15-60厘米深度处的Olsen-P较低，方差与田间差异密切相关。 Olsen-P在0-15 cm的田间差异与管理有密切关系。对于历史上曾接受肥料或肥料结合耕作的田地，观察到的Olsen-P升高，而对于低投入有机田和免耕田，观察到Olsen-P降低。对于八个采样场中的六个，通过地形湿度指数（TWI）预测了0-15厘米深度处Olsen-P的高比例变化（r（2）= 0.46-0.96，p <0.01），更好在低投入和免耕田间观察到的预测能力。尽管与管理历史相关的这种关系存在差异，但在所有采样区中均观察到与TWI的显着正相关（r（2）= 025，p <0.0001，n = 56）。低洼地区磷积累的趋势凸显了在加拿大大草原冰河形成的地形上实施的各种农场管理系统可能会降低这些地区的输入速率，但是需要针对目标应用制定管理系统特定建议在本案例研究中也进行了说明。官方版权（C）2016，由Elsevier B.V.保留所有权利。

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