Profile distribution and temporal changes of sulphate and nitrate contents and related soil properties under beech and spruce forests

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• 作者：Vá ; clav Tejneck&yacute ; ^a ; ^{tejnecky@af.czu.cz} ; Monika Bradová ; ^a ; Lubo&scaron ; Bor?vka^a ; Karel N¨§me?ek^a ; Ond?ej &Scaron ; ebek^b ; Antoní ; n Nikodem^a ; Jitka Zená ; hlí ; ková ; ^c ; Jan Rejzek^c ; Ond?ej Drá ; bek^a
• 关键词：Soil acidification ; Vegetation cover ; Forest soils ; Anions ; Sulphate ; Nitrate
• 刊名：Science of the Total Environment
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：442
• 期：Complete
• 页码：165-171
• 全文大小：422 K

文摘

The behaviour of principal inorganic anions in forest soils, originating mainly from acid deposition, strongly influences the forest ecosystem response on acidification. The aim of this study was to describe seasonal and temporal changes of sulphate and nitrate contents and related soil properties under beech and spruce forests in a region heavily impacted by acidification. The Jizera Mountains area (Czech Republic) was chosen as such a representative mountainous soil ecosystem. Soil samples were collected at monthly intervals from April to October during the years 2008-2010 under both beech and spruce stands. Soil samples were collected from surface fermentation (F) and humified (H) organic horizons, humic (A) organo-mineral horizons and subsurface mineral (B) horizons (cambic or spodic). A deionised water extract was applied to unsieved fresh samples and the content of anions in these extracts was determined by ion chromatography (IC).

In the studied soil profiles, the lowest amount of SO₄^2 ? was found in the organo-mineral A horizons under both types of vegetation. Under spruce the highest amount of SO₄^2 ? was determined in mineral spodic (B) horizons, where a strong sorption influence of Fe and Al oxy-hydroxides is expected. Under beech the highest amount was observed in the surface organic F horizons (forest floor). The amount of NO₃^? is highest in the F horizons and decreases with increasing soil profile depth under both types of vegetation. A significantly higher amount of NO₃^? was determined in soils under the beech stand compared to spruce. For both soil environments - under beech and also spruce stands - we have determined a general increase of water-extractable SO₄^2 ? and NO₃^? during the whole monitoring period. The behaviour of SO₄^2 ? and NO₃^? in the soils is strongly related to the dynamics of soil organic matter and particularly to the DOC.