Quantified images plus videos of iron and manganese reduction of IRIS films in hypersaline soils

These data belong to the research project (AQUASALT), EraNET that in Spain has been supported by grant PCI2018-09299 funded by MCIN/AEI/10.13039/50110 0 011033 and co-funded by the European Union. The data corresponds to the Spanish study area, the Salineta inland saline wetland (41°28'55.34"N, 0° 9'23.59"W) located 60 km far from Zaragoza city, in one of the most arid areas of the Central Ebro Basin, NE Spain. In this project we studied the redox conditions of the hypersaline soils in Salineta playa-lake, which are subjected to intermittent flooding, along a period of 17 months, in 2019 and 2020. The data were obtained during the monitoring of the soil redox conditions using IRIS (Indicators of Reduction in Soils) films and clear IRIS tubes coated with iron oxide and manganese oxide and supplied by the Prof. Martin Rabenhorst and Dr. Brian Scott, from the University of Maryland, USA. The monitoring of the IRIS films consisted on the quantification of the oxide-coating removed from the films. The oxide-coating of the films was reduced and then dissolved due to the microbial action. Firstly, the manganese-oxide coated films and later the iron-oxide coated films lost gradually their cover paint until showing the white underlying PVC film without paint. Content: This dataset comprises 20 folders corresponding to the 10 iron plus 10 manganese IRIS film samplings in Salineta playa-lake. Each IRIS sampling includes also a video obtained with the clear IRIS tubes installed close to the IRIS films. We followed the method and camera instrument described in Scott et al. (2021) (DOI: 10.1002/saj2.20171). The videos of the soil allowed the direct monitoring of the oxide-paint removal and guided the successive sampling of the IRIS films. Each sampling included the video-image monitoring of the clear-IRIS tubes and the retrieval of three replicates of Fe and Mn IRIS films. Each folder contains the field photographs of the three iron or manganese films sampled. The photographs were processed: after cropping to the area of interest, they were binarized and the reduced (white) area of the film was then quantified. The numbering of the folders follows the order of sampling, from 1 to 10, and folders are labeled with F for iron and with M for manganese films. The Excel worksheet included in the present dataset contains the quantification data of the oxide-coating removed from iron and manganese films, together with the quantification of the black sulfides deposited on the iron films. The film area under reducing conditions (white PVC film) is expressed in percentage of the total film area. This percentage of paint removed has been calculated: 1) for every cm of the film depth (50 cm), 2) in the upper 0-30 cm of the film, and 3) in the total length of the film (0-50 cm). The removal rate indicates the reducing conditions evolution and intensity in the studied soils of the saline wetland.本数据集隶属于AQUASALT研究项目，该项目属于EraNET联合研究计划，在西班牙由MCIN/AEI/10.13039/501100011033资助的项目编号PCI2018-09299，并由欧盟联合出资。本数据集对应西班牙境内的研究区域——萨利内塔内陆盐沼湿地，其地理坐标为北纬41°28'55.34"、西经0°9'23.59"，距离萨拉戈萨市60公里，地处西班牙东北部埃布罗河中游最干旱的区域之一。 本项目针对该萨利内塔干盐湖内的高盐土壤氧化还原条件展开了为期17个月的监测，监测时段为2019年至2020年，该类土壤会遭受间歇性淹水。数据采集采用了IRIS（土壤还原指示剂，Indicators of Reduction in Soils）薄膜与涂覆氧化铁、氧化锰的透明IRIS管，相关器材由美国马里兰大学的马丁·拉本霍斯特（Martin Rabenhorst）教授与布莱恩·斯科特（Brian Scott）博士提供。IRIS薄膜的监测方法为量化其表面剥落的氧化物涂层：在微生物作用下，薄膜表面的氧化物涂层会被还原并溶解，首先是涂覆氧化锰的薄膜，随后是涂覆氧化铁的薄膜，其表面涂层会逐渐脱落，最终露出下方未涂层的白色PVC基底。 本数据集共包含20个文件夹，对应10组氧化铁IRIS薄膜采样与10组氧化锰IRIS薄膜采样。每组IRIS采样还附带一段视频，拍摄自安装在IRIS薄膜附近的透明IRIS管，本研究遵循了Scott等人2021年发表的方法与摄像设备方案（DOI: 10.1002/saj2.20171）。土壤视频可直接监测氧化物涂层的剥落进程，辅助后续IRIS薄膜的采样工作。每组采样均包含对透明IRIS管的视频图像监测，以及3组氧化铁与氧化锰IRIS薄膜的重复采样。每个文件夹内包含本次采集的3组氧化铁或氧化锰薄膜的野外实拍照片。照片经过预处理：先裁剪至目标观测区域，随后进行二值化处理，最终量化薄膜上被还原的白色区域占比。文件夹编号按照采样顺序从1至10编排，以“F”标识氧化铁薄膜采样组，以“M”标识氧化锰薄膜采样组。 本数据集附带的Excel工作表包含了从氧化铁与氧化锰IRIS薄膜上剥落的氧化物涂层量化数据，以及沉积在氧化铁薄膜上的黑色硫化物量化数据。还原条件下的薄膜区域（白色PVC基底）占薄膜总面积的百分比已被计算，该涂层剥落百分比分为三类：1）按薄膜深度每1厘米（总深度50厘米）分别计算；2）薄膜上层0-30厘米区域；3）薄膜全长（0-50厘米）。涂层剥落速率可反映该盐沼湿地研究区域内土壤还原条件的演化过程与强度。