Standing crop, production, and turnover of fine roots on dry, moderate, and wet sites of mature Douglas-fir in western Oregon

Santantonio, D.; Hermann, Richard K.

doi:10.1051/forest:19850201

Cited by 203 publications

(131 citation statements)

References 30 publications

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“…The limitations underlined here join the general views (B6hm, 1979;Santantonio and Hermann, 1985), stating how timeconsuming precise root studies can be. An improvement of the methods described here might be to provide for the possibility of taking samples at various precise developmental stages, giving access to studies on root turnover and productivity, and to the study of nutrient cycles.…”

Section: Introductionmentioning

confidence: 70%

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The study of tree fine root distribution and dynamics using a combined trench and observation window method

Bedeneau¹,

Auclair²

1989

Ann. For. Sci.

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Section: Introductionmentioning

confidence: 70%

“…Only a few studies have dealt with adult forest trees, mainly due to the considerable technical problems involved (B6hm, 1979 (Persson, 1983;Santantonio and Hermann, 1985;Ries, 1988). In The method used here is that of regionalized variables developed by Matheron (1965) for prospecting and evaluating geological deposits.…”

Section: Introductionmentioning

confidence: 99%

The study of tree fine root distribution and dynamics using a combined trench and observation window method

Bedeneau¹,

Auclair²

1989

Ann. For. Sci.

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“…However, this missing biomass should represent a very small part of the total root system biomass. It must also be recalled that fine root biomass may vary all along the year in relation to fine root turnover [21,31]. However, in the study site of Hesse, the data obtained by Epron et al [12] showed that the living fine root biomass varied only slightly during the growing season.…”

Section: Tree Root Biomass and Biomass Incrementmentioning

confidence: 98%

Root biomass and biomass increment in a beech (Fagus sylvatica L.) stand in North-East France

Goff

Ottorini

2001

Ann. For. Sci.

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-This study is part of a larger project aimed at quantifying the biomass and biomass increment of an experimental beech stand aged 30 years, and comparing the carbon sequestration in trees to carbon fluxes. The below ground part of trees is expected to play an important role in carbon sequestration. A method has been developed to estimate the biomass and biomass increment of coarse, small and fine roots of trees from root system excavations of sampled trees of different crown classes. The biomass and biomass increment of broken root ends during excavation was estimated from the diameter of the roots at the broken points. Equations were then established relating the biomass and biomass increment of the different root categories to tree DBH. These equations were then used to estimate the root biomass and biomass increment of the experimental stand from stem inventory, for the different root categories. Trees from dominant and codominant crown classes contribute for more than 80% to below ground biomass and biomass increment of the stand. root system / biomass / biomass increment / biomass distribution / Fagus sylvatica Résumé -Biomasse et accroissement en biomasse du système racinaire dans un peuplement de hêtre du Nord-Est de la France. Cette étude fait partie d'un projet plus vaste ayant pour objectif l'estimation de la biomasse aérienne et souterraine d'un peuplement expérimental de hêtre de 30 ans et de son accroissement, pour comparer la quantité de carbone séquestrée annuellement dans les arbres aux flux de carbone mesurés par les échanges gazeux. La partie souterraine des arbres paraît jouer un rôle important dans la séquestration du carbone. Une méthode a été développée pour estimer la biomasse et l'accroissement en biomasse des racines de différentes catégories de grosseur grâce à l'extraction du sol de systèmes racinaires d'un échantillon d'arbres représentatif des diffé-rentes classes de statut social du peuplement. La biomasse et l'accroissement en biomasse des parties de racines cassées lors de l'extraction du sol ont pu être estimés, pour chaque catégorie de racine, à partir du diamètre des racines au niveau de la cassure. Des relations ont ensuite été établies entre la biomasse racinaire et son accroissement, pour chaque catégorie de racines, et le diamètre de l'arbre à 1,30 m. Ces équations ont été utilisées pour estimer les biomasses au niveau du peuplement à partir de l'inventaire des arbres. Les arbres dominants et codominants du peuplement contribuent pour plus de 80 % à la biomasse souterraine du peuplement et à son accroissement. système racinaire / biomasse / accroissement de la biomasse / répartition de la biomasse / Fagus sylvatica

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“…The external factors, including temperature, water content, and chemical characteristics of the soil may also control the decay rate of fine roots [22]. Similar mass losses have been reported for fine roots of the Chinese fir (61.3%) after 1 year of decomposition in Huitong north of our research site [15], while much lower values of 12% to 25% were obtained for red pine, Scots pine, Douglas fir, and mixed hardwood in temperate zones [4,11,19].…”

Section: Dry Weight Lossmentioning

confidence: 99%

Decomposition dynamic of fine roots in a mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum in mid-subtropics

et al. 2004

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-Decomposition of fine roots (< 2 mm in diameter, viz. < 0.5 mm, 0.5-1.0 mm, 1.0-2.0 mm) was studied by means of litter bag in a mixed forest of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) and Tsoong's tree (Tsoongiodendron odorum Chun) in Sanming, Fujian, China. In a 540 d period of decay, fine roots in all litter bags decomposed in a three-phase manner: (a) for the Chinese fir, an initial, relatively low rate of decay up to 90 d followed by a period of rapid weight loss until 270 d, and then by a phase of slow decay rate; (b) for the Tsoong's tree, a rapid loss period between 0-60 d followed by a relatively rapid loss period between 60-360 d, and then a slow loss period between 360-540 d occurred. The mass loss after 1 yr of decomposition ranged from 58.5% to 63.3% for the Chinese fir and 68.8% to 78.2% for the Tsoong's tree. Fine roots with a larger diameter had a lower rate of mass loss. Consistent increase in lignin concentration and decrease in absolute amount of phosphorus (P) were found for fine roots of the two tree species during decomposition. The absolute amounts of nitrogen (N) increased a little initially in the fine roots of the Chinese fir during a short duration. In contrast, the fine roots of Tsoong's tree were releasing N from the outset. The chemical composition controlled decomposition rate and it was found a change of TNC (total nonstructural carbohydrates)-regulating in the initial decomposition phase to lignin-or N-regulating in the second phase, and P-or lignin-regulating in the last phase.fine root / decomposition / lignin / nitrogen / phosphorus / mixed forest / Cunninghamia lanceolata / Tsoongiodendron odorum Résumé -Dynamique de la décomposition des radicelles dans une forêt mélangée de Cunninghamia lanceolata et Tsoongiodendron odorum en zone subtropicale. On a étudié la décomposition de radicelles de diamètre inférieur à 2 mm (< 0,5 mm; 0,5 à 1,0 mm; 1,0 à 2,0 mm) en utilisant des sacs enterrés dans la litière, dans une forêt mélangée de sapin de Chine (Cunninghamia lanceolata (Lamb.) Hook) et d'arbres de Tsoong (Tsoongiodendron odorum Chun) située à Sanming, Fujian, Chine. Au cours des 540 jours d'observation de la dégradation des radicelles, leur décomposition s'est déroulée selon trois phases. a) Pour le sapin de Chine, on enregistre un taux initial de dégradation relativement lent jusqu'à 90 jours, puis une perte rapide de poids au cours de la période suivante allant jusqu'à 270 jours, et ensuite un taux de dégradation lent. b) Pour l'arbre de Tsoong, on constate une perte de poids rapide au cours des 60 premiers jours, puis une perte relativement rapide jusqu'à 360 jours et enfin une perte lente entre 360 et 540 jours. La perte de poids après 1 an de décomposition est comprise entre 58,5 % et 63,3 % pour le sapin de Chine et entre 68,8 % et 78,2 % pour l'arbre de Tsoong. La perte de poids est moindre pour les radicelles les plus grosses. On note chez les deux espèces, au cours de la décomposition, une certaine augmentation du taux de lignine et une nette réduc...

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Standing crop, production, and turnover of fine roots on dry, moderate, and wet sites of mature Douglas-fir in western Oregon

Abstract: SummaryStanding crops of live and dead fine (< I mm diameter) and small (1 to 5 mm diameter) roots

Cited by 203 publications

References 30 publications

The study of tree fine root distribution and dynamics using a combined trench and observation window method

The study of tree fine root distribution and dynamics using a combined trench and observation window method

Root biomass and biomass increment in a beech (Fagus sylvatica L.) stand in North-East France

Decomposition dynamic of fine roots in a mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum in mid-subtropics

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