Detection of nitrate leaching through bypass flow using pan lysimeter, suction cup, and resin capsule
Detection of nitrate leaching through bypass flow using pan lysimeter, suction cup, and resin capsule
复制标题
使用盘蒸渗仪、吸盘和树脂胶囊通过旁路流检测硝酸盐浸出
DOI：
10.1080/00380768.2000.10409135
复制
发表时间：
2000
影响因子：
2
通讯作者：
R. Hatano
中科院分区：
文献类型：
--
作者：
M. Pampolino;T. Urushiyama;R. Hatano
摘要我们比较了使用混合床离子交换树脂胶囊（RC），吸盘（SC），潘蒸渗仪（PL），地下排水（DR）的检测硝酸盐运动通过粘土，洋葱（洋葱L.）经过了七个月的培育在表土水平，SC收集的溶液显示出比PL收集的样品更高的NO3 −浓度。然而，在80 cm深度，DR和PL样品的NO3-浓度高于SC样品，表明旁路或大孔隙流是NO3-向地下排水或地下水传输的主要机制，而SC收集的溶液主要代表土壤团聚体内部的溶液。使用树脂胶囊法导致15厘米深度的NO3 −值最初高于50厘米深度，但在充分沥滤和植物吸收后，趋势发生逆转。在RC安装期间，RC在15 cm深度处吸附的NO3 −量与DR样品中NO3 −的平均浓度之间以及RC在50 cm深度处吸附的NO3 −与PL样品在80 cm深度处的平均NO3 −浓度之间存在高度显著的相关性。这些结果表明，RC方法，使通过大孔流的硝酸盐迁移的检测是一个很有前途的技术硝酸盐淋溶测量。
Abstract We compared the use of mixed-bed ion exchange resin capsules (RC), suction cups (SC), pan lysimeters (PL), and subsurface drainage (DR) for the detection of nitrate movement through a clayey soil where onion (Allium cepa L.) had been cultivated over a period of seven months. At the topsoil level, solutions collected with SC showed higher concentrations of NO3 − than the PL-collected samples. At 80-cm depth, however, the concentrations of NO3 − were higher for the DR and PL samples than for the SC samples, suggesting that bypass or macropore flow was the primary mechanism of NO3 − transport to subsurface drainage or groundwater, while solutions collected by SC mostly represented solutions inside soil aggregates. The use of the resin capsule method resulted in higher values of NO3 − at 15- than at 50-cm depth initially but the trend was reversed after sufficient leaching and plant uptake. High and significant correlations were obtained between the amount of NO3 − adsorbed on RC at 15-cm depth and the mean concentration of NO3 − in the DR samples during the RC installation period and between the NO3 − adsorbed on RC at 50-cm depth and the mean NO3 − concentration of PL samples at 80-cm depth. Such results indicate that the RC method which enables the detection of nitrate transport via macropore flow is a promising technique for nitrate leaching measurements.