Stream water concentrations of herbicides and nutrients for sites in the northern Missouri and southern Iowa region, 1994 to 1999

The data set contains stream water concentrations of herbicides and nutrients for 153 sites in the northern Missouri/southern Iowa region from 1994 to 1995. The data are available in Microsoft Excel 2010 format. Sheet 1 (Metadata) of the file contains supporting information regarding the length of record, site locations, parameters measured, concentrations units, method detection limits, describes the meaning of zero and blank cells, defines the major land resource areas (MLRAs) of the region, and provides a link to the U. S. Geological Survey discharge data. Sheet 2 (Site names and locations) has a list of the site names by MLRA, river system, and site name. It also contains site locations, provided as Universal Transverse Mercator coordinates, drainage areas, and indicates which sites were co-located at U. S. Geological Survey gauge sites. Sheet 3 (Concentration Data) contains data for 15 herbicide and nutrient analytes along with the corresponding site name, river system, and MLRA.

Atrazine concentrations in Goodwater Creek Experimental Watershed (GCEW) were shown to be among the very highest of any watershed in the United States based on comparisons using the national Watershed Regressions for Pesticides (WARP) model and by direct comparison with the 112 watersheds used in the development of WARP. The herbicide data collected in GCEW are documented at plot, field, and watershed scales. This 20-yr-long (1991-2010) effort was augmented with a spatially broad effort within the Central Mississippi River Basin encompassing 12 related claypan watersheds in the Salt River Basin, two cave streams on the fringe of the Central Claypan Areas in the Bonne Femme watershed, and 95 streams in northern Missouri and southern Iowa. The research effort on herbicide transport has highlighted the importance of restrictive soil layers with smectitic mineralogy to the risk of transport vulnerability. Near-surface soil features, such as claypans and argillic horizons, result in greater herbicide transport than soils with high saturated hydraulic conductivities and low smectitic clay content. Resources in this dataset:Resource Title: GeoData catalog record. File Name: Web Page, url: https://geodata.nal.usda.gov/geonetwork/srv/eng/catalog.search#/metadata/GoodwaterNutrient_jjm_2015-03-12_1534

该数据集收录了1994年至1995年间，密苏里州北部与爱荷华州南部地区153个监测点的除草剂和营养物水浓度数据。数据以Microsoft Excel 2010格式提供。文件的第一张表格（元数据）包含了关于记录长度、监测点位置、测量参数、浓度单位、检测限度的支持信息，并对零值和空白单元格的含义进行了描述，定义了该区域的主要土地利用资源区域（MLRAs），并提供了美国地质调查局排放数据的链接。第二张表格（站点名称和位置）列出了按MLRA、河流系统和站点名称排列的站点名称，还包括了站点位置、作为通用横轴墨卡托坐标提供的位置信息、排水面积，以及哪些站点与美国地质调查局的测流站重合。第三张表格（浓度数据）包含了15种除草剂和营养物分析物的数据，以及相应的站点名称、河流系统和MLRA。在Goodwater Creek实验流域（GCEW）中，通过使用国家流域回归模型（WARP）进行对比以及与用于WARP开发的112个流域的直接对比，证实了其阿特拉津浓度是美国任何流域中最高的之一。GCEW中收集的除草剂数据在地块、田野和流域尺度上均有记录。这一持续20年（1991-2010）的研究工作，在密西西比河流域中心区域进行扩展，覆盖了盐河盆地内的12个相关粘土平原流域，以及Bonne Femme流域边缘中央粘土平原区域的两个洞穴溪流，以及密苏里州北部和爱荷华州南部的95条溪流。关于除草剂迁移的研究强调了具有滑石矿物学的限制性土壤层对于迁移风险的重要性。近地表土壤特征，如粘土盘和粘粒层，比具有高饱和水力传导率和低滑石粘土含量的土壤更容易导致除草剂的迁移。本数据集资源：资源标题：GeoData目录记录。文件名：网页，网址：https://geodata.nal.usda.gov/geonetwork/srv/eng/catalog.search#/metadata/GoodwaterNutrient_jjm_2015-03-12_1534