Coarse root biomass for eucalypt plantations in Tasmania, Australia: sources of variation and methods for assessment

Resh, Sigrid C.; Battaglia, Michael; Worledge, Dale; Ladiges, S

doi:10.1007/s00468-003-0250-6

Cited by 69 publications

(66 citation statements)

References 27 publications

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“…Coarse roots are multifunctional tree components providing key functions such as transport (nutrients, photosynthate, water), storage (sugars and nutrients), biomechanical stabilization, as well as the framework upon which fine root develop and connect (Resh et al, 2003;Guo et al, 2013;Cook and Weigh, 2005).…”

Section: Root Harvestingmentioning

confidence: 99%

Root Structure and Belowground Biomass of Hybrid Poplar in Forestry and Agroforestry Systems in Mediterranean France

Jha

2017

Not Sci Biol

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In poplar, one of the most used species of forestry and agroforestry, below ground biomass allocation plays an important role in providing anchorage as well as efficient nutrient and water distribution channel. Available literature on this aspect is not enough in hybrid Poplar, Populus euramaricana I-214. Therefore, the study was aimed at finding how this species developed its root system and how much belowground biomass was allocated in Forest System (FRS) and Agroforest System (AFS). This was done using soil excavation and root coring methods. Coarse roots were distributed in all directions but their number and proximal cross section area (CSA) were not uniform. In the case of AFS tree maximum CSA was distributed in the south and south-west direction while in FRS it was in the north-east and south-east direction. Fine roots were observed throughout the rooting zone along with coarse and medium roots up to a maximum depth of 2.4 m in FRS and 2.8 m in AFS. Total belowground biomass was higher in AFS tree (130 kg tree -1 ) than FRS tree (120 kg tree -1 ). But on hectare basis FRS accumulated (24.5 Mg ha ). However, if practiced in surplus agriculture area and considered the system as a whole, AFS allows grain production in lieu of some biomass deficit.

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Section: Root Harvestingmentioning

confidence: 99%

Root Structure and Belowground Biomass of Hybrid Poplar in Forestry and Agroforestry Systems in Mediterranean France

Jha

2017

Not Sci Biol

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“…In order to complement the information available for large values of stand aboveground biomass, literature describing eucalyptus root biomass in other countries was obtained. Available information for E. globulus (Resh et al, 2003) was used to fit the final equation. No information was found for root biomass from coppiced stands.…”

Section: Estimation Of Stand Root Biomassmentioning

confidence: 99%

“…Table 2 presents the characteristics of the dataset. (Resh et al, 2003 An independent dataset was used to compare estimates of total stand biomass that were obtained using tree allometric equations, a constant BEF or the BEF prediction equation. The dataset contains data from continuous forest inventory and from permanent plots of two other Portuguese pulp companies (Oliveira, 2008).…”

Section: Changes In Bef With Stand Characteristics and Development Ofmentioning

confidence: 99%

Biomass expansion factors for Eucalyptus globulus stands in Portugal

Soares¹,

Tomé²

2012

For. syst.

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One of several procedures for estimating carbon stocks in forests is the estimation of tree or stand biomass based on forest inventory data. The two approaches normally used to convert field measurements of trees to stand biomass values are allometric biomass equations and biomass expansion factors (BEFs). BEFs are used in published National Forest Inventory results in which biomass is not estimated or as a complement of growth models that do not include biomass predictions. In this paper, the effectiveness of BEFs for estimating total stand biomass in Portuguese Eucalyptus globulus plantations was analyzed. Here, BEF is defined as the ratio of total stand biomass (aboveground biomass plus root biomass) to stand volume with bark. To calculate total biomass, an equation was developed to estimate root biomass as a function of aboveground biomass. Changes of BEF with stand variables were analyzed. Strong relationships were observed between BEF and stand age, stand basal area, stand volume and dominant height. Consequently, an equation to predict BEF as a function of stand variables was fitted, and dominant height was selected as the predictor stand variable. Estimates of total stand biomass based on individual tree allometric equations were compared with estimates obtained with a constant BEF (0.77), used in the Portuguese National Inventory Report on Greenhouse Gases, and with estimates obtained using the dominant height-dependent BEF equation developed in this work. The BEF prediction model proposed in this work may be used to improve E. globulus Portuguese biomass estimates when tree allometric equations cannot be used.Key words: root biomass; aboveground biomass; biomass expansion factors; allometric equations. Resumen Factores de expansión de la biomasa de rodales de Eucalyptus globulus en PortugalEl objetivo es estimar las reservas de carbono en los bosques mediante la comparación de dos métodos: ecuaciones alométricas de biomasa y los factores de expansión de la biomasa (BEF). Las estimaciones de la biomasa total del rodal, basado en las ecuaciones alométricas de árboles individuales se compararon con las estimaciones obtenidas con unos factores de expansión constante de la biomasa (BEF) de 0.77, utilizados en el Informe del Inventario Nacional de Portugal de gases de efecto invernadero, y con las estimaciones obtenidas utilizando la ecuación de altura dominante de BEF desarrollada en este trabajo. En este trabajo se analizó la eficacia de la BEF para estimar la biomasa total del stand en portugués plantaciones de Eucalyptus globulus. Aquí, el BEF se define como el cociente de la biomasa total del stand (biomasa aérea más la biomasa de raíces), situándose el volumen con corteza. Para el cálculo de la biomasa total, se desarrolló una ecuación para estimar la biomasa de raíces en función de la biomasa sobre el suelo. Se analizaron los cambios de BEF con las variables del rodal. Se observó una gran relación entre el BEF y la edad del rodal, el área basal, el volumen y la altura dominante. Por lo tanto, ...

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“…Coarse roots are also multifunctional tree components providing key functions such as transport (nutrients, photosyntate, water), storage (sugars and nutrients) and biomechanical stabilisation, as well as being the framework upon which fine root develop and connect [41][42][43]. The relative importance of such functions will likely vary with tree development and growth environment.…”

Section: Introductionmentioning

confidence: 99%

Plastic Allometry in Coarse Root Biomass of Mature Hybrid Poplar Plantations

et al. 2015

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In this study, we sampled coarse root biomass of three poplar clones in four 13-year-old hybrid poplar (Populus spp.) plantations, with the objective of developing an allometric relationship between diameter at breast height (DBH) and coarse root biomass. A second objective was to test significance of site, clone and ×site clone interaction effects on coarse root biomass, using analysis of covariance (ANCOVA), with DBH as a covariate. Across the four sites, the general allometric relationship between DBH and coarse root biomass was highly significant (R 2 =0.78, p<0.001). However, given the high significance of the site effect (p< 0.001) in the ANCOVA and the differences in data distribution between sites, two allometric relationships were developed based on the fertility class of sites (high and moderate). Environmentspecific allometric relationships developed for two site fertility classes had a better fit (R 2 =0.81-0.90, p<0.001). ANCOVA, with DBH as a covariate and site fertility class as a main effect, also showed that both of these variables significantly affected (p <0.001) coarse root biomass allocation. Environmentspecific equations showed that higher coarse root biomass was allocated in harsher environments for a given DBH, probably to improve access to growth limiting soil nutrients or to build-up larger storage sites for amino acids and non-structural carbohydrates. Consequently, poplar coarse root biomass growth is both driven by ontogeny (size) and environment, reflecting the plasticity of the root system of mature poplars. Implications of using general vs. environment-specific equations in estimating stand-level root biomass and shoot to root ratios are discussed. Shoot to root ratios calculated using environment-specific equations were more strongly correlated to key environmental variables than ratios calculated using the general equation, with soil NO 3 supply rate being the strongest predictor of the ratio (R 2 =0.90, p<0.001).

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Coarse root biomass for eucalypt plantations in Tasmania, Australia: sources of variation and methods for assessment

Cited by 69 publications

References 27 publications

Root Structure and Belowground Biomass of Hybrid Poplar in Forestry and Agroforestry Systems in Mediterranean France

Root Structure and Belowground Biomass of Hybrid Poplar in Forestry and Agroforestry Systems in Mediterranean France

Biomass expansion factors for Eucalyptus globulus stands in Portugal

Plastic Allometry in Coarse Root Biomass of Mature Hybrid Poplar Plantations

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