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Is the simple auger coring method reliable for below-ground standing biomass estimation in Eucalyptus forest plantations?

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Background and Aims Despite their importance for plant production, estimations of below-ground biomass and
its distribution in the soil are still difficult and time consuming, and no single reliable methodology is available for different root types. To identify the best method for root biomass estimations, four different methods, with labour requirements, were tested at the same location.
Methods The four methods, applied in a 6-year-old Eucalyptus plantation in Congo, were based on different soil sampling volumes: auger (8 cm in diameter), monolith (25 × 25 cm quadrate), half Voronoi trench (1.5 m3) and a full Voronoi trench (3 m3), chosen as the reference method.
Key Results With the reference method (0–1m deep), fine-root biomass (FRB, diameter ,2 mm) was estimated
at 1.8 t ha21, medium-root biomass (MRB diameter 2–10 mm) at 2.0 t ha21, coarse-root biomass (CRB, diameter .10 mm) at 5.6 t ha21 and stump biomass at 6.8 t ha21. Total below-ground biomass was estimated at 16.2 t ha21 (root : shoot ratio equal to 0.23) for this 800 tree ha21 eucalypt plantation density. The density of FRB was very high (0.56 t ha21) in the top soil horizon (0–3 cm layer) and decreased greatly (0.3 t ha21) with depth (50–100 cm). Without labour requirement considerations, no significant differences were found between the four methods for FRB and MRB; however, CRB was better estimated by the half and full Voronoi trenches.
When labour requirements were considered, the most effective method was auger coring for FRB, whereas the
half and full Voronoi trenches were the most appropriate methods for MRB and CRB, respectively.
Conclusions As CRB combined with stumps amounted to 78% of total below-ground biomass, a full Voronoi
trench is strongly recommended when estimating total standing root biomass. Conversely, for FRB estimation, auger coring is recommended with a design pattern accounting for the spatial variability of fine-root distribution.
Key words: Eucalypt plantation, Eucalyptus urophylla, E. grandis, root biomass, auger, monolith, Voronoi
trench, accuracy and precision, labour requirements, Congo.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

: Oxford University Press on behalf of the Annals of Botany Company., 2011

Deskripsi Fisik

Annals of Botany 108: 221–230, 2011

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TANAMAN PERTANIAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

Yuli/Agus

Versi lain/terkait

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