Soil nitrogen dynamics in a holm oak forest

Bonilla, David; Rod�, F.

doi:10.1007/bf00118231

Cited by 25 publications

(8 citation statements)

References 40 publications

(27 reference statements)

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“…For example, phosphorus availability in the silicate soils of our study area might be reduced by aluminium and ferric oxides and hydroxides (Nanzyo et al 1993;Crews et al 1995). The lack of effect of nitrogen surplus could be due to the acidic soil pH, which reduces nitrification, or to rapid mineralization (Bonilla & Rodà 1992). Finally, nutrient leaching is also a possibility in the highly permeable soil of our study area.…”

Section: Discussionmentioning

confidence: 95%

Effects of fertilization and neighbour removal on biomass allocation and fruit production inCistus ladanifer

Delgado

Serrano

López

et al. 2011

Plant Biosystems - An International Journal Dealing with all As

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The aim of this article was to assess short-term (11 months) changes in vegetative biomass allocation and in reproductive output in response to increased nutrient availability and to different intra-specific competition scenarios in adult C. ladanifer plants. We performed a factorial field experiment with four treatments: (1) no fertilization and no neighbour removal, (2) fertilization (400 kg ha 71 of controlled release NPK fertilizer) and no neighbour removal, (3) no fertilization and neighbour removal (all vegetation growing within a 2 m radius around the target plant were cut) and (4) fertilization and neighbour removal. We found a significant interaction between fertilization and neighbour removal affecting patterns of biomass allocation; plants without neighbours allocated relatively more biomass to leaves and less to branches only in the nonfertilized group, with no evident effect on the fertilized one. Furthermore, the positive effects of neighbour removal on number and biomass of fruits were appreciable regardless of nutrient conditions, which suggest that competition intensity was independent from soil fertility.

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Section: Discussionmentioning

confidence: 95%

Effects of fertilization and neighbour removal on biomass allocation and fruit production inCistus ladanifer

Delgado

Serrano

López

et al. 2011

Plant Biosystems - An International Journal Dealing with all As

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“…Vegetative growth is more vigorous and frequently overlaps with flowering at mid‐spring. In this period, soil nutrient availability and nutrient uptake by roots are high (Bonilla & Rodá, 1992; Serrasoles et al ., 1999), and could provide a large proportion of the nutrients required for growth. Both N and P remobilization peak sharply in mid‐summer when soil supply is scarce.…”

Section: Discussionmentioning

confidence: 99%

Relationships between phenology and the remobilization of nitrogen, phosphorus and potassium in branches of eight Mediterranean evergreens

et al. 2005

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Summary• Few studies have examined the effects of plant growth on nutrient remobilization in phenologically contrasting species. Here we evaluated the consequences of above-ground seasonality of growth and leaf shedding on the remobilization of nutrients from branches in eight evergreen Mediterranean phanaerophytes that differ widely in phenology.• Vegetative growth, flower bud formation, flowering, fruiting, leaf shedding, and the variations in nitrogen (N), phosphorus (P) and potassium (K) pools in branches throughout the year were monitored in each species.• Nitrogen and P remobilization occurred in summer, after vegetative growth and synchronously with leaf shedding. Despite the time-lag between growth and remobilization, the branches that invested more nutrients in vegetative growth also remobilized more nutrients from their old organs. Potassium remobilization peaked in the climatically harshest periods, and appears to be related to osmotic requirements.• We conclude that N and P remobilization occurs mainly associated with leaf senescence, which might be triggered by factors such as the replenishment of nutrient reserves in woody organs, the hormonal relations between new and old leaves, or the constraints that summer drought poses on the amount of leaf area per branch in summer.

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“…Robertson (1982) used relative nitrification as an independent test of site factors (e.g., soil pH, C to N ratio) that potentially influence in situ nitrification. Relative nitrification has been shown to vary considerably with stand type, with much higher relative nitrification generally associated with hardwood than with conifer forests (Bonilla and Rodà 1992;Gilliam et al 2004;Fenn et al 2005). High relative nitrification also has been Fig.…”

Section: Effects Of Freezing On Net N Mineralization and Net Nitrificmentioning

confidence: 99%

Effects of experimental freezing on soil nitrogen dynamics in soils from a net nitrification gradient in a nitrogen-saturated hardwood forest ecosystem

2010

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This study examined effects of soil freezing on N dynamics in soil along an N processing gradient within a mixed hardwood dominated watershed at Fernow Experimental Forest, West Virginia. Sites were designated as LN (low rates of N processing), ML (moderately low), MH (moderately high), and HN (high). Soils underwent three 7-day freezing treatments (0, -20, or -80 8C) in the laboratory. Responses varied between temperature treatments and along the gradient. Initial effects differed among freezing treatments for net N mineralization, but not nitrification, in soils across the gradient, generally maintained at LN < ML MH < HN for all treatments. Net N mineralization potential was higher following freezing at -20 and -80 8C than control; all were higher than at 0 8C. Net nitrification potential exhibited similar patterns. LN was an exception, with net nitrification low regardless of treatment. Freezing response of N mineralization differed greatly from that of nitrification, suggesting that soil freezing may decouple two processes of the soil N cycle that are otherwise tightly linked at our site. Results also suggest that soil freezing at temperatures commonly experienced at this site can further increase net nitrification in soils already exhibiting high nitrification from N saturation.Résumé : Nous avons étudié les effets du gel du sol sur la dynamique de N dans le sol le long d'un gradient de transformation de N dans un bassin versant dominé par des feuillus mélangés à la Forêt expérimentale de Fernow, en Virginie-Occidentale. Les stations ont été classées sur la base du taux de transformation de N: LN (faible), ML (modérément faible), MH (modérément élevé) et HN (élevé). Les sols ont subi trois périodes de gel de 7 jours (0, -20 ou -80 8C) en laboratoire. Les réactions ont varié selon la température ainsi que le long du gradient. Les effets initiaux étaient différents selon l'intensité du gel dans le cas de la minéralisation nette mais pas dans le cas de la nitrification dans les sols le long du gradient qui s'est généralement maintenu à LN < ML < MH < HN avec tous les traitements. Le potentiel de minéralisation nette de N était plus élevé à la suite d'un gel à -20 et -80 8C que chez le témoin et plus élevé qu'à 0 8C dans tous ces traitements. Le potentiel de nitrification nette suivait le même patron. La station LN faisait exception: la nitrification nette était faible peu importe le traitement. La réponse de la minéralisation de N au gel était très différente de celle de la nitrification, indiquant que le gel du sol peut découpler deux processus du cycle de N dans le sol qui sont par ailleurs étroite-ment reliés dans notre site. Les résultats indiquent aussi que le gel du sol à des températures qui surviennent couramment dans ce site peut augmenter davantage la nitrification nette dans les sols où la nitrification est déjà élevée à cause de la saturation en N.[Traduit par la Rédaction]

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Soil nitrogen dynamics in a holm oak forest

Cited by 25 publications

References 40 publications

Effects of fertilization and neighbour removal on biomass allocation and fruit production inCistus ladanifer

Effects of fertilization and neighbour removal on biomass allocation and fruit production inCistus ladanifer

Relationships between phenology and the remobilization of nitrogen, phosphorus and potassium in branches of eight Mediterranean evergreens

Effects of experimental freezing on soil nitrogen dynamics in soils from a net nitrification gradient in a nitrogen-saturated hardwood forest ecosystem

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