Soil solution chemistry associated with rainfall simulations investigating nocturnal CO2 uptake by soil in the Tabernas Desert

This dataset contains soil solution chemistry measurements collected during rainfall simulation and soil solution extraction campaigns conducted between 9 October 2020 and 21 March 2021 at 5 cm under mature cyanobacterial crusts in the experimental site of El Cautivo (Tabernas Desert, Almeria, Spain). The dataset was generated to investigate the geochemical processes associated with nocturnal CO₂ uptake by soils, with a particular focus on coupled gypsum dissolution–calcite precipitation processes. Measurements include pH, temperature, alkalinity, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), major cations (Ca, Mg, Na, K), major anions (SO₄²⁻, Cl⁻, NO₃⁻), and mineral saturation indices for calcite and gypsum.本数据集包含2020年10月9日至2021年3月21日期间，在西班牙阿尔梅里亚省塔韦纳斯沙漠的埃尔考蒂沃（El Cautivo）试验站点，成熟蓝藻结皮下方5厘米处开展的降雨模拟与土壤溶液提取实验中采集的土壤溶液化学测定数据。该数据集旨在探究土壤夜间吸收二氧化碳相关的地球化学过程，重点关注石膏溶解-方解石沉淀的耦合过程。本次测定的指标包括pH值、温度、碱度、溶解性无机碳（dissolved inorganic carbon, DIC）、溶解性有机碳（dissolved organic carbon, DOC）、主要阳离子（钙Ca、镁Mg、钠Na、钾K）、主要阴离子（硫酸根SO₄²⁻、氯根Cl⁻、硝酸根NO₃⁻），以及方解石和石膏的矿物饱和指数。