Repository_Soda_Saline_2018

The major ion concentration data of sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), chloride (Cl), sulphate (SO₄), bicarbonate (HCO₃), carbonate (CO₃) and pH (if it was coupled with ion data) were input into the database. The data were drawn from a large geographic scale across Eurasia (Austria, China, Hungary, Kazakhstan, Mongolia, Russia, Serbia, Turkey) and from a large number of saline lakes and pans (N=220) with minimum a 1.0 g L^–1 salinity threshold. The 1.0 g L^–1 salinity threshold was selected based on a former study (Boros et al., 2014), where this threshold was experimentally found to be the characteristic boundary of soda ecosystems. Salinity was estimated by the sum of measured concentrations of eight major ions (Na, K, Ca, Mg, Cl, SO₄, HCO₃, CO₃). As generally known, sodium is by far the most common cation in saline lakes and necessarily the dominant cation in soda type lakes. Therefore, sites were excluded from the dataset if Na was not the most abundant ion. If seasonal or annual water data were available, mean values were put into database. Most of the data came from papers (sources are indicated in the table) published in the period from 1956‒2017. <br>钠（Sodium, Na）、钾（Potassium, K）、钙（Calcium, Ca）、镁（Magnesium, Mg）、氯（Chloride, Cl）、硫酸盐（Sulphate, SO₄）、碳酸氢盐（Bicarbonate, HCO₃）、碳酸盐（Carbonate, CO₃）的主要离子浓度数据，以及与离子观测配套的pH值（若有对应同步观测），均被录入数据库。<br>该数据集的采样范围覆盖横跨欧亚大陆的广大区域，涵盖奥地利、中国、匈牙利、哈萨克斯坦、蒙古国、俄罗斯、塞尔维亚、土耳其等国，共包含220个盐度阈值不低于1.0 g·L⁻¹的盐湖与盐沼浅湖（N=220）。<br>本次采用的1.0 g·L⁻¹盐度阈值参考自Boros等人2014年的研究，该研究通过实验证实该阈值为苏打型生态系统的特征边界。<br>盐度通过8种主要离子（Na、K、Ca、Mg、Cl、SO₄、HCO₃、CO₃）的实测浓度之和估算得到。<br>众所周知，钠是盐湖中最为常见的阳离子，且必然为苏打型盐湖的优势阳离子。因此，若某采样点的优势阳离子并非钠，则将其从数据集中剔除。<br>若存在季节性或年度水体监测数据，则取其平均值录入数据库。<br>本数据集的绝大多数数据来源于1956年至2017年间发表的学术论文，具体文献来源详见附表。