Etude comparative de deux écosystèmes forestiers feuillu et résineux des Ardennes primaires françaises II. - Biomasse aérienne d'une plantation équienne d'Epicéa commun (Picea abies Karst.)

Ranger, Dominique; Nys, C.; Ranger, Jacques; Bréchet, C.; Doudou, J.; Gelhaye, Dominique; Lefèvre, Yves

doi:10.1051/forest:19810305

Cited by 1 publication

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“…Model parameters were either fixed based on values taken in the scientific literature or based on measurements made in the level II plots or in other experimental plots: fixed parameters: leaf area index (Bréda, ; Pokorny et al ., ), specific leaf area (Ranger et al ., ), maximum canopy interception capacity (Whelan & Anderson, ), parameters regulating litter decomposition and mineralization (Parmentier & Remacle, ; Jonard et al ., ), nitrification rate (Andrianarisoa et al ., ) and microbial C : N ratio (Malchair & Carnol, ), monthly litterfall amount and chemistry (RENECOFOR and REWASEF level II plots), tree growth rate determined based on yield tables (Dagnelie et al ., ). adjusted parameters: coefficient to adjust up or down evapo‐transpiration, distribution of nutrient uptake with soil depth, weathering rate determined by comparing predicted weathering fluxes with those reported for the Ardennes (Bonneau, ). …”

Section: Methodsmentioning

confidence: 99%

“…fixed parameters: leaf area index (Bréda, ; Pokorny et al ., ), specific leaf area (Ranger et al ., ), maximum canopy interception capacity (Whelan & Anderson, ), parameters regulating litter decomposition and mineralization (Parmentier & Remacle, ; Jonard et al ., ), nitrification rate (Andrianarisoa et al ., ) and microbial C : N ratio (Malchair & Carnol, ), monthly litterfall amount and chemistry (RENECOFOR and REWASEF level II plots), tree growth rate determined based on yield tables (Dagnelie et al ., ).…”

Section: Methodsmentioning

confidence: 99%

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Deterioration ofNorway spruce vitality despite a sharp decline in acid deposition: a long‐term integrated perspective

Jonard

Legout²,

Nicolas

et al. 2011

Global Change Biology

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Since the late 1970s, several long-term ecological studies were conducted to better understand the biogeochemical functioning of Norway spruce stands in the Ardennes as these nutrient-poor ecosystems were subject to high levels of acid deposition and exhibited symptoms of tree health decline. Between 1978 and 2009, acid deposition declined sharply, especially sulfur and to a lesser extent nitrogen deposition. The aim of this study was (i) to determine if the Norway spruce stands recovered after the reduction of acid deposition and (ii) to explain why such a recovery occurred or not. Therefore, we collected data from different projects carried out in the Ardennes to characterize the long-term temporal trends in soil solution chemistry, foliar nutrition, and crown condition. In parallel, a model describing the nutrient cycling in forests (NuCM) was calibrated and used to check the consistency of the observed temporal trends and to explain them. The soil solution concentration of most of the elements decreased between 1978 and 2002, which was ascribed to a decrease in atmospheric deposition. For potassium, a decline in the exchangeable pool was also showed based on the simulation carried out with NuCM. As nitrogen (N) deposition remained at an elevated level, Norway spruce stands were progressively saturated in N and mineral nutrition became more and more unbalanced. Except the foliar N and Al concentration that remained constant and increased respectively, the foliar concentration of all other nutrients decreased between 1993 and 2009, which can be explained by the decrease in ion concentration in solution. These nutritional disorders weakened trees and were probably exacerbated during the 2003 summer drought, after which symptoms of vitality loss progressively appeared. In these N-saturated ecosystems, the N cycle was disrupted by this health decline, which increased NO 3 À leaching reinforcing soil acidification and risk of aluminum (Al) toxicity.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Deterioration ofNorway spruce vitality despite a sharp decline in acid deposition: a long‐term integrated perspective

Jonard

Legout²,

Nicolas

et al. 2011

Global Change Biology

View full text Add to dashboard Cite

show abstract

Etude comparative de deux écosystèmes forestiers feuillu et résineux des Ardennes primaires françaises II. - Biomasse aérienne d'une plantation équienne d'Epicéa commun (Picea abies Karst.)

Abstract: Recherches forl'sti¿ ' res de Nallcy.Cha ll1 pl ' no ll x, F 54280 Seic h a /1/ ps

Cited by 1 publication

References 2 publications

Deterioration ofNorway spruce vitality despite a sharp decline in acid deposition: a long‐term integrated perspective

Deterioration ofNorway spruce vitality despite a sharp decline in acid deposition: a long‐term integrated perspective

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