State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, PR China.
Ecotoxicol Environ Saf. 2020 Aug;199:110678. doi: 10.1016/j.ecoenv.2020.110678. Epub 2020 May 11.
NaCl and NaSO are the foremost salt compositions in coastal wetlands, while their effects on soil net nitrogen mineralization still remain unclear. Aimed at investigating the two salt compositions on soil net nitrogen mineralization, a 30-day laboratory incubation experiment was respectively conducted by adding 5‰ NaCl and NaSO to incubated coastal wetland soils under aerobic conditions. Our results showed that NaSO addition increased the rates of mineralization (R) by an average of 33.03% and nitrification (R) by 23.84% during the incubation (p < 0.05). In contrast, NaCl addition significantly reduced R by 71% and R by 44% at day 7 (p < 0.05). The activities of fluorescein diacetate, arylamidase and urease in NaSO addition treatments were higher than those in NaCl addition treatment. These results demonstrated the ion-specific effects of salt type on nitrogen mineralization rates and enzyme activities.
NaCl 和 NaSO 是滨海湿地中最主要的盐分组成，但其对土壤净氮矿化的影响尚不清楚。本研究通过向好气条件下培养的滨海湿地土壤中添加 5‰的 NaCl 和 NaSO，进行为期 30 天的实验室培养实验，旨在研究这两种盐对土壤净氮矿化的影响。结果表明，NaSO 处理在培养过程中平均分别增加了氮矿化（R）和硝化（R）速率 33.03%和 23.84%（p<0.05）。相比之下，NaCl 处理在第 7 天显著降低了 R 和 R 分别为 71%和 44%（p<0.05）。NaSO 处理中荧光二乙酸酯、芳基酰胺酶和脲酶的活性均高于 NaCl 处理。这些结果表明盐类型对氮矿化速率和酶活性具有离子特异性效应。
