The impact of four decades of annual nitrogen addition on dissolved organic matter in a boreal forest soil

Rappe-George, M. O.; Gärdenäs, Annemieke I.; Kleja, Dan Berggren

doi:10.5194/bg-10-1365-2013

Cited by 15 publications

(10 citation statements)

References 45 publications

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“…As SUVA is a common indicator of DOM aromaticity, this result suggests that the long-term N addition shifted soil DOM to a higher relative abundance of aromatics in the deeper soil horizons. Short-term N additions in different forests have shown distinct responses of SUVA to N addition. , However, the present results coincide with an earlier finding that 4 decades of N addition increased the SUVA of soil-derived DOM in B horizons but not in O horizons in a boreal forest and another finding that SUVA and soluble phenols in soil DOM at 75 cm were all increased at four different forests with 10 years of N addition . Furthermore, the average E2/E3 ratios were consistently lower in the N-added soils than those in control soils in all horizons (Figure ).…”

Section: Resultssupporting

confidence: 88%

“…While several studies have hypothesized that DOM may respond differentially to the long-term addition, ,,, this study identified previously unreported shifts in DOM composition with long-term N addition. After 22 years of N addition, soil-derived DOM exhibited a minor increase in its storage (an increase of ∼10%) but had significant alterations in its optical properties and molecular-level composition.…”

Section: Resultsmentioning

confidence: 66%

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Long-Term Nitrogen Addition Alters the Composition of Soil-Derived Dissolved Organic Matter

Wang

Liu

Bowden

et al. 2019

ACS Earth Space Chem.

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Forest soil dissolved organic matter (DOM) is a major source of terrigenous dissolved organic carbon (DOC) that is an important component of biogeochemical cycles. While many studies have shown that DOM dynamics are regulated strongly by nitrogen availability, how continued or increasing deposition of reactive nitrogen to forests alters the molecular composition of soil DOM remains unexplored. We studied the storage and molecular-level composition of soil-derived DOM after 22 years of nitrogen addition in a temperate deciduous forest. Soil DOC quantity changes were small (+19.0 g/m2; ∼10% increase) but the molecular composition changed markedly. Indices based on optical spectroscopy suggested that DOM molecular size and aromaticity were elevated with nitrogen addition. Nuclear magnetic resonance analyses showed that DOM contained more carbohydrates and aromatics but less aliphatic compounds with nitrogen addition. Ultrahigh-resolution mass spectrometric analysis further supports the finding that solid-phase isolated DOM from nitrogen-added soils was larger in molecular size and aromaticity. Condensed aromatic dissolved black carbon, particularly those compounds with high molecular size/carbon number and those stored in deep soils, showed the greatest percent increase with nitrogen addition. These results countered our hypothesis that soluble carbohydrates would be selectively removed from the DOC pool compared to polyphenols and condensed aromatic components under nitrogen enrichment. These changes in DOM molecular composition may also impact microbial communities and downstream metabolism of DOC.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 66%

Long-Term Nitrogen Addition Alters the Composition of Soil-Derived Dissolved Organic Matter

Wang

Liu

Bowden

et al. 2019

ACS Earth Space Chem.

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“…There are studies that found increased DOC concentrations (Pregitzer et al, 2004;Fröberg et al, 2013;Shi et al, 2019). However, other field studies did not find effects on DOC from N applications (Magill et al, 2004;McDowell et al, 2004;Rappe-George et al, 2013). In fact the conventional concept for forest fertilization is to repeat application after around seven years which corresponded well to the duration of fertilization effects seen in this study.…”

Section: Discussionsupporting

confidence: 75%

Duration of forest fertilization effects on streamwater chemistry in a catchment in central Sweden

Lundin

Nilsson

2021

Forest Ecology and Management

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Demands for forest biomass production for energy, construction and carbon storage purposes are increasing, and therefore measures to increase tree growth are required. One potential measure is nitrogen (N) fertilization, as N is usually the most growth-limiting nutrient in boreal forests and partly due to decreasing atmospheric N deposition in northern Europe in recent decades. However, N fertilization can have adverse effects, such as soil acidification and N leaching, particularly nitrate leaching via streamwater flow. To mitigate the acidification risk, dolomite (CaMg(CO 3 ) 2 ) is added to N fertilizer boron (B) as increased tree growth hamper tree uptake of this essential micronutrient.This study examined the effects of forest fertilization on streamwater chemistry in the 45 ha Swedish catchment Risfallet (RF), around 80% of which was treated with fertilizer. That was rather exceptional, as most previous catchments studied have had <50% treated area, which may give weaker treatment signals. A paired catchment method combined with the control area and calibration period technique was applied to evaluate leaching effects from forest fertilization. Effects over 7.5 years were compared with previously reported initial effects in the first year, in order to assess the duration of fertilization effects on surface water. High excess outflow of N over five years was detected, with 20% of the applied amount leached and with nitrate dominating total nitrogen. Excess outflow of Ca and Mg was highest in the first year. Effects on pH were limited, with calculated untreated pH on 5.9 being on average 0.4 units lower during the first six months and then remaining at 0.2 units lower.Recommended could be to mainly fertilize well-drained soil, avoid wet areas and open streams. Consider the hydrological conditions while weather would be more hazardous to foresee.

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“…Under most conditions, the addition of N did not change the overall pattern of monthly changes in soil DOC and DIC as compared to the control. In many studies only minor or no effects of addition N have been found 35,36 . We found that the soil DOC changes significantly and rapidly between months.…”

Section: Discussionmentioning

confidence: 99%

The effects of nitrogen addition on dissolved carbon in boreal forest soils of northeastern China

Shi

Dech

Yao

et al. 2019

Sci Rep

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Understanding the effects of nitrogen (N) addition on dissolved carbon in boreal forest soils is essential for accurate evaluation of regional carbon balances. The objective of this study was to determine the effects of different levels and types of N addition on soil dissolved carbon concentration in a cold-temperate coniferous forest through an in-situ fertilization experiment. Simulated atmospheric N addition was applied in a factorial experiment with N addition level (control, 10, 20 and 40 kg of N ha −1 yr −1 ) and N type (NH 4 Cl, KNO 3 and NH 4 NO 3 ) treatments. The experiment was conducted over the 2010 growing season (May-September) at the Kailaqi farm of Genhe Forestry Bureau, located in the northern Great Xin’an mountain range, northern China. Monthly N addition treatments were applied in three replicate plots per treatment (n = 36), and measurements of dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) were derived from monthly sampling of the organic and mineral soil horizons. There was a significant effect of N type, with the combined N source (NH 4 NO 3 ) producing significantly higher DOC than the control (ambient addition) or the NH 4 Cl treatment in both the organic and mineral layers. The N addition treatment increased DIC in the organic layer at the low levels only, while N type did not have a significant effect. There was a significant interaction of the month and the N level treatment, as low level N addition tended to increase the content of soil DOC while high level N tended to inhibit soil DOC content, with these trends being most pronounced in the middle of the growing season. These results elucidate the importance of the type and timing of N additions to the dynamics of soil carbon pools.

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The impact of four decades of annual nitrogen addition on dissolved organic matter in a boreal forest soil

Cited by 15 publications

References 45 publications

Long-Term Nitrogen Addition Alters the Composition of Soil-Derived Dissolved Organic Matter

Long-Term Nitrogen Addition Alters the Composition of Soil-Derived Dissolved Organic Matter

Duration of forest fertilization effects on streamwater chemistry in a catchment in central Sweden

The effects of nitrogen addition on dissolved carbon in boreal forest soils of northeastern China

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