Effects of soil, light, and temperature on freshwater tannin concentrations

Tannins are plant secondary compounds that leach into soil and water. Tannin concentrations can be higher in lentic freshwater than other aquatic ecosystems, which can result in toxicity to freshwater organisms. While the amount of plant material and the plant tissue concentrations af-fect aqueous tannin concentrations, little is known about which environmental conditions alter the removal and breakdown of tannins in freshwater, altering the exposure of freshwater organisms. We investigated the effects of soil, light, and temperature to aqueous tannin concentrations.

单宁（Tannins）是一类可淋溶进入土壤与水体的植物次生代谢物。静水淡水生态系统（lentic freshwater）中的单宁浓度通常高于其他水生生态系统，这可能对淡水生物产生毒性作用。尽管植物生物量与植物组织内的单宁含量会影响水体中的单宁浓度，但目前学界对于哪些环境条件会改变淡水生态系统中单宁的降解与移除过程、进而影响淡水生物的暴露水平，仍知之甚少。本研究探究了土壤、光照与温度对水体单宁浓度的影响。