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Closed depressions and soil phosphorus influence subsurface phosphorus losses in a tile‐drained field in Illinois
Journal of Environmental Quality ( IF 2.4 ) Pub Date : 2020-07-29 , DOI: 10.1002/jeq2.20120
Luis F. Andino 1 , Lowell E. Gentry 1 , Jennifer M. Fraterrigo 1, 2
Affiliation  

Artificial subsurface (tile) drainage systems can convey phosphorus (P) from agricultural fields to surface waters; however, controls of subsurface dissolved reactive P (DRP) losses at the sub-field scale are not fully understood. We characterized subsurface DRP loads and flow-weighted mean concentration (FWMC) from January 2015 through September 2017 to determine seasonal (growing vs. non-growing) patterns from 36 individually monitored plots across a farm under a corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] rotation in east-central Illinois. Using linear mixed models, we investigated the effects of soil test P (STP), depression depth, and their interaction with precipitation and P fertilization on subsurface DRP losses. Dissolved reactive P loads in drainage tiles increased with precipitation and were greatest during the non-growing season (NGS) in 2016 and 2017. Annual subsurface DRP loads were positively related to STP, and during the NGS, there was a positive relationship between depression depth quantified at the plot-scale and subsurface DRP loads and FWMC. Along a depression-depth gradient, piecewise regression displayed a threshold at a depth of 0.38 m at which STP increased, indicating soil P accumulation in deeper closed depressions. Our study highlights the need to identify areas with the greatest risk of subsurface P losses to implement sub-field scale nutrient management practices.

中文翻译:

封闭洼地和土壤磷影响伊利诺伊州瓦片排水田的地下磷损失

人工地下(瓷砖)排水系统可以将磷(P)从农田输送到地表水;然而,在子场尺度下对地下溶解反应性磷 (DRP) 损失的控制尚不完全清楚。我们对 2015 年 1 月至 2017 年 9 月的地下 DRP 负荷和流量加权平均浓度 (FWMC) 进行了表征,以确定玉米 (Zea mays L.) 下农场的 36 个单独监测地块的季节性(生长与非生长)模式和大豆 [Glycine max (L.) Merr.] 在伊利诺伊州中东部轮作。使用线性混合模型,我们研究了土壤测试磷 (STP)、洼地深度及其与降水和磷肥的相互作用对地下 DRP 损失的影响。排水砖中的溶解反应性磷负荷随着降水而增加,并且在 2016 年和 2017 年的非生长季节 (NGS) 期间最大。年度地下 DRP 负荷与 STP 呈正相关,在 NGS 期间,洼地深度之间存在正相关关系在地块尺度和地下 DRP 载荷和 FWMC 上量化。沿着洼地-深度梯度,分段回归在 0.38 m 深度显示阈值,此时 STP 增加,表明土壤 P 在更深的封闭洼地中积累。我们的研究强调需要确定地下 P 损失风险最大的区域,以实施亚田规模的养分管理实践。在地块尺度上量化的凹陷深度和地下 DRP 载荷与 FWMC 之间存在正相关关系。沿着洼地-深度梯度,分段回归在 0.38 m 深度显示阈值,此时 STP 增加,表明土壤 P 在更深的封闭洼地中积累。我们的研究强调需要确定地下 P 损失风险最大的区域,以实施亚田规模的养分管理实践。在地块尺度上量化的凹陷深度和地下 DRP 载荷与 FWMC 之间存在正相关关系。沿着洼地-深度梯度,分段回归在 0.38 m 深度显示阈值,此时 STP 增加,表明土壤 P 在更深的封闭洼地中积累。我们的研究强调需要确定地下 P 损失风险最大的区域,以实施亚田规模的养分管理实践。
更新日期:2020-07-29
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