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首页> 美国卫生研究院文献>Springer Open Choice >Extraction of soil solution by drainage centrifugation—effects of centrifugal force and time of centrifugation on soil moisture recovery and solute concentration in soil moisture of loess subsoils
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Extraction of soil solution by drainage centrifugation—effects of centrifugal force and time of centrifugation on soil moisture recovery and solute concentration in soil moisture of loess subsoils

机译：排水离心法提取土壤溶液—离心力和离心时间对黄土深层土壤水分回收和土壤水分中溶质浓度的影响

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摘要

The solute concentration in the subsoil beneath the root zone is an important parameter for leaching assessment. Drainage centrifugation is considered a simple and straightforward method of determining soil solution chemistry. Although several studies have been carried out to determine whether this method is robust, hardly any results are available for loess subsoils. To study the effect of centrifugation conditions on soil moisture recovery and solute concentration, we sampled the subsoil (1.5–3.0 m depth) at commercial farms in the loess region of the Netherlands. The effect of time (20, 35, 60, 120 and 240 min) on recovery was studied at two levels of the relative centrifugal force (733 and 6597g). The effect of force on recovery was studied by centrifugation for 35 min at 117, 264, 733, 2932, 6597 and 14,191g. All soil moisture samples were chemically analysed. This study shows that drainage centrifugation offers a robust, reproducible and standardised way for determining solute concentrations in mobile soil moisture in silt loam subsoils. The centrifugal force, rather than centrifugation time, has a major effect on recovery. The maximum recovery for silt loams at field capacity is about 40%. Concentrations of most solutes are fairly constant with an increasing recovery, as most solutes, including nitrate, did not show a change in concentration with an increasing recovery.
机译：根区下方地下土壤中的溶质浓度是浸出评估的重要参数。排水离心法被认为是确定土壤溶液化学性质的一种简单直接的方法。尽管已经进行了一些研究来确定这种方法是否可靠，但对于黄土深层土几乎没有任何结果。为了研究离心条件对土壤水分回收和溶质浓度的影响，我们在荷兰黄土地区的商业农场对地下土壤（深度1.5-3.0 m）进行了采样。在两个相对离心力水平（733和6597g）下研究了时间（20、35、60、120和240分钟）对恢复的影响。通过以117、264、733、2932、6597和14,191g离心35分钟来研究力对恢复的影响。对所有土壤水分样品进行化学分析。这项研究表明，排水离心法为测定粉壤土壤土中流动土壤水分中的溶质浓度提供了一种可靠，可重现和标准化的方法。离心力而不是离心时间对回收率有重要影响。田间土壤淤泥壤土的最大回收率约为40％。大多数溶质的浓度随回收率的增加而相当恒定，因为大多数溶质（包括硝酸盐）的浓度均未随回收率的增加而变化。

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