Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor

[eng] The research reported in this thesis focuses on studying the effects of naturally occurring mycorrhiza and the role of forest floor in the cycling of P in fast growing forest plantations. In order to study the effects of mycorrhizae on forest soils fertility and the subsequent seedling growth...

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Author: Romanyà i Socoró, Joan
Format: doctoral thesis
Status:Published version
Publication Date:1993
Country:España
Institution:Universidad de Barcelona
Repository:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/36109
Online Access:https://hdl.handle.net/2445/36109
http://www.tdx.cat/TDX-0201110-114543
http://hdl.handle.net/10803/957
Access Level:Open access
Keyword:Sòls forestals
Arrels (Botànica)
Nutrició vegetal
Forest soils
Roots (Botany)
Plant nutrition
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oai_identifier_str oai:diposit.ub.edu:2445/36109
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
title Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
spellingShingle Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
Romanyà i Socoró, Joan
Sòls forestals
Arrels (Botànica)
Nutrició vegetal
Forest soils
Roots (Botany)
Plant nutrition
title_short Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
title_full Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
title_fullStr Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
title_full_unstemmed Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
title_sort Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floor
dc.creator.none.fl_str_mv Romanyà i Socoró, Joan
author Romanyà i Socoró, Joan
author_facet Romanyà i Socoró, Joan
author_role author
dc.contributor.none.fl_str_mv Vallejo, V. Ramón (Victoriano Ramón)
Universitat de Barcelona. Departament de Biologia Vegetal
dc.subject.none.fl_str_mv Sòls forestals
Arrels (Botànica)
Nutrició vegetal
Forest soils
Roots (Botany)
Plant nutrition
topic Sòls forestals
Arrels (Botànica)
Nutrició vegetal
Forest soils
Roots (Botany)
Plant nutrition
description [eng] The research reported in this thesis focuses on studying the effects of naturally occurring mycorrhiza and the role of forest floor in the cycling of P in fast growing forest plantations. In order to study the effects of mycorrhizae on forest soils fertility and the subsequent seedling growth response, radiata pine (Pinus radiata D. Don) seedlings were grown in pots using the soil collected from a mature (23 year old) radiata pine plantation. The experiment was arranged in a two factor design. The treatments comprised of sterilized and unsterilized soil, either fertilized with superphosphate (100 KgP/ha) or remained non-fertilized. In an attempt to explore nutrient uptake mechanisms under contrasted soil fertility and under mycorrhizal and non-mycorrhizal conditions, Barber-Cushman nutrient uptake model was used to simulate nutrient uptake in these treatments. Mycorrhiza suppressed treatments showed low mineral NO3-N concentration and high autoclave N in soil. NH,-N concentration was not affected by any treatment. Water and bicarbonate soluble reactive P (SRP) and soluble non-reactive P (NRP) were not changed by mycorrhiza. Phosphatase activity greatly decreased in mycorrhiza suppressed treatments. Despite superphosphate addition increased all forms of P, acid phosphatase activity did not change by this factor. Mycorrhiza suppression decreased seedling growth but not root length or surface. Non-mycorrhizal seedlings showed a much large proportion of roots thinner than 0.5 mm diameter. While in 7 month old seedling needle development was delayed in nonmycorrhizal pots, 4 months later all needles had the same size. At this stage of growth, plant adapted to nutritional shortages by loosing needles. Except in non-mycorrhizal-unfertilized seedlings, where growth was limited by P, in the other treatments growth was N and Mg limited. Mycorrhizal associations increased the specific uptake rate (mmol cm(-1) root) for N, P, K, S, Mg, Ca and Al. While under natural P availability conditions, P uptake was largely reduced after mycorrhiza suppression, under high P availability it was hardly increased by mycorrhiza. Barber-Cushman model was able to predict the relative variations in P and Mg uptake only in non-mycorrhizal treatments. While P uptake appeared to be controlled by root surface, Mg uptake was mostly regulated by root length. To study the role of the forest floor in the cycling of nutrients, nutrient leaching through litter layers was monitored in a mature radiata pine plantation (18 year old) using 20 zerotension lysimeters installed underneath the Oa horizon. Both P and N concentrations in the litter leachates showed large seasonal changes. Organic P compounds were more readily retained at the forest floor than organic N compounds. A large proportion of nutrients leached throughout the year (51% and 61% of total P and N exported respectively) took place during short periods of time. Most N transferred from the forest floor to the mineral soil was in organic form. In contrast, P was mostly transferred as inorganic P (SRP). The total amount of nutrient exported to the mineral soil were of the same order of magnitude than the yearly nutrient increases in aboveground biomass. There were evidences suggesting that a major content part of this nutrient flow originated in the forest canopy. Using a new proposed anion resin fractionation technique, P forms in litter leachates and soil solution were compared. This technique showed that Murphy and Riley method to determine P concentration in solution was not able to distinguish clearly between inorganic and organic P in solution. One limitation of the fractionation technique was that it was not a clean separation of organic and inorganic P forms. However, it does appear to be useful for documenting relative changes in P forms when samples are contrasted. In a mixed Eucalyptus forest in SE Australia, the effect of slash burning on surface soil P forms and on sorption and desortption of P were studied. According to fire intensity, three different microsites were selected: unburnt , burnt and intensely burnt. The effects of fire on soil P were greatest in the surface soil horizons and depended upon fire intensity. After fire labile inorganic P (Bray I) increased from <1 mg kg(-1) to 5-13 mg kg(-1) in the ash bed. The increase in labile organic P (NaHCO2) contrasted with a decrease in total organic P (H2SO4) and less labile organic P (NaOH) in ashbed soils. The ashbed soil showed an increase insorption capacity in the 0-5 cm layer, but the sorbed P was generally less tightly bound to the solid phase.
publishDate 1993
dc.date.none.fl_str_mv 1993
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/36109
http://www.tdx.cat/TDX-0201110-114543
http://hdl.handle.net/10803/957
url https://hdl.handle.net/2445/36109
http://www.tdx.cat/TDX-0201110-114543
http://hdl.handle.net/10803/957
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv (c) Romanyà i Socoró, 1993
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Romanyà i Socoró, 1993
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona
publisher.none.fl_str_mv Universitat de Barcelona
dc.source.none.fl_str_mv Tesis Doctorals - Departament - Biologia Vegetal
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422632511733760
spelling Phosphorus cycling in fast growing forest plantations: availability, plant uptake and the role of forest floorRomanyà i Socoró, JoanSòls forestalsArrels (Botànica)Nutrició vegetalForest soilsRoots (Botany)Plant nutrition[eng] The research reported in this thesis focuses on studying the effects of naturally occurring mycorrhiza and the role of forest floor in the cycling of P in fast growing forest plantations. In order to study the effects of mycorrhizae on forest soils fertility and the subsequent seedling growth response, radiata pine (Pinus radiata D. Don) seedlings were grown in pots using the soil collected from a mature (23 year old) radiata pine plantation. The experiment was arranged in a two factor design. The treatments comprised of sterilized and unsterilized soil, either fertilized with superphosphate (100 KgP/ha) or remained non-fertilized. In an attempt to explore nutrient uptake mechanisms under contrasted soil fertility and under mycorrhizal and non-mycorrhizal conditions, Barber-Cushman nutrient uptake model was used to simulate nutrient uptake in these treatments. Mycorrhiza suppressed treatments showed low mineral NO3-N concentration and high autoclave N in soil. NH,-N concentration was not affected by any treatment. Water and bicarbonate soluble reactive P (SRP) and soluble non-reactive P (NRP) were not changed by mycorrhiza. Phosphatase activity greatly decreased in mycorrhiza suppressed treatments. Despite superphosphate addition increased all forms of P, acid phosphatase activity did not change by this factor. Mycorrhiza suppression decreased seedling growth but not root length or surface. Non-mycorrhizal seedlings showed a much large proportion of roots thinner than 0.5 mm diameter. While in 7 month old seedling needle development was delayed in nonmycorrhizal pots, 4 months later all needles had the same size. At this stage of growth, plant adapted to nutritional shortages by loosing needles. Except in non-mycorrhizal-unfertilized seedlings, where growth was limited by P, in the other treatments growth was N and Mg limited. Mycorrhizal associations increased the specific uptake rate (mmol cm(-1) root) for N, P, K, S, Mg, Ca and Al. While under natural P availability conditions, P uptake was largely reduced after mycorrhiza suppression, under high P availability it was hardly increased by mycorrhiza. Barber-Cushman model was able to predict the relative variations in P and Mg uptake only in non-mycorrhizal treatments. While P uptake appeared to be controlled by root surface, Mg uptake was mostly regulated by root length. To study the role of the forest floor in the cycling of nutrients, nutrient leaching through litter layers was monitored in a mature radiata pine plantation (18 year old) using 20 zerotension lysimeters installed underneath the Oa horizon. Both P and N concentrations in the litter leachates showed large seasonal changes. Organic P compounds were more readily retained at the forest floor than organic N compounds. A large proportion of nutrients leached throughout the year (51% and 61% of total P and N exported respectively) took place during short periods of time. Most N transferred from the forest floor to the mineral soil was in organic form. In contrast, P was mostly transferred as inorganic P (SRP). The total amount of nutrient exported to the mineral soil were of the same order of magnitude than the yearly nutrient increases in aboveground biomass. There were evidences suggesting that a major content part of this nutrient flow originated in the forest canopy. Using a new proposed anion resin fractionation technique, P forms in litter leachates and soil solution were compared. This technique showed that Murphy and Riley method to determine P concentration in solution was not able to distinguish clearly between inorganic and organic P in solution. One limitation of the fractionation technique was that it was not a clean separation of organic and inorganic P forms. However, it does appear to be useful for documenting relative changes in P forms when samples are contrasted. In a mixed Eucalyptus forest in SE Australia, the effect of slash burning on surface soil P forms and on sorption and desortption of P were studied. According to fire intensity, three different microsites were selected: unburnt , burnt and intensely burnt. The effects of fire on soil P were greatest in the surface soil horizons and depended upon fire intensity. After fire labile inorganic P (Bray I) increased from <1 mg kg(-1) to 5-13 mg kg(-1) in the ash bed. The increase in labile organic P (NaHCO2) contrasted with a decrease in total organic P (H2SO4) and less labile organic P (NaOH) in ashbed soils. The ashbed soil showed an increase insorption capacity in the 0-5 cm layer, but the sorbed P was generally less tightly bound to the solid phase.Universitat de BarcelonaVallejo, V. Ramón (Victoriano Ramón)Universitat de Barcelona. Departament de Biologia Vegetal1993info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/36109http://www.tdx.cat/TDX-0201110-114543http://hdl.handle.net/10803/957Tesis Doctorals - Departament - Biologia Vegetalreponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglés(c) Romanyà i Socoró, 1993info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/361092026-05-27T06:46:51Z
score 15,301603

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