当前位置： SCI文献检索 > ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY期刊下所有文献 > Biogeochemical toxicity and phytotoxicity of nitrogenous compounds in a variety of arctic soils.

Biogeochemical toxicity and phytotoxicity of nitrogenous compounds in a variety of arctic soils.

Abstract：

:Ammonium nitrate (NH(4)NO(3)) is a common water pollutant associated with many industrial and municipal activities. One solution to reduce exposure of sensitive aquatic systems to nitrogenous compounds is to atomize (atmospherically disperse in fine particles) contaminated water over the Arctic tundra, which will reduce nitrogen loading to surface water. The toxicity of ammonium nitrate to Arctic soils, however, is poorly understood. In the present study, we characterized the biogeochemical toxicity and phytotoxicity of ammonium nitrate solutions in four different Arctic soils and in a temperate soil. Soil was exposed to a range of ammonium nitrate concentrations over a 90-d period. Dose responses of carbon mineralization, nitrification, and phytotoxicity endpoints were estimated. In addition to direct toxicity, the effect of ammonium nitrate on ecosystem resilience was investigated by dosing nitrogen-impacted soils with boric acid. Ammonium nitrate had no effect on carbon mineralization activity and only affected nitrification in one soil, a polar desert soil from Cornwallis Island, Northwest Territories, Canada. In contrast, ammonium nitrate applications (43 mmol N/L soil water) significantly impaired seedling emergence, root length, and shoot length of northern wheatgrass (Elymus lanceolatus). Concentrations of ammonium nitrate in soil water that inhibited plant parameters by 20% varied between 43 and 280 mmol N/L soil water, which corresponds to 2,100 to 15,801 mg/L of ammonium nitrate in the application water. Arctic soils were more resistant to ammonium nitrate toxicity compared with the temperate soil under these study conditions. It is not clear, however, if this represents a general trend for all polar soils, and because nitrogen is an essential macronutrient, nitrogenous toxicity likely should be considered as a special case for soil toxicity.

journal_name

Environ Toxicol Chem

journal_title

Environmental toxicology and chemistry

authors

Anaka A,Wickstrom M,Siciliano SD

doi

10.1897/07-567

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

1809-16

issue

eissn

0730-7268

issn

1552-8618

pii

07-567

journal_volume

pub_type

杂志文章

在线工具

Biogeochemical toxicity and phytotoxicity of nitrogenous compounds in a variety of arctic soils.