Carbon and nitrogen in forest soils: Potential indicators for sustainable management of eucalypt forests in south-eastern Australia

Hopmans, P.; Bauhus, Jürgen; Khanna, P.; Weston, Christopher J.

doi:10.1016/j.foreco.2005.08.006

Cited by 43 publications

(26 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similarly, Alexis et al (2007) reported char production rates of 0.14 kg BC m −2 in a Florida scrub-oak ecosystem. Much greater increases in site charcoal (<2 mm, to 30 cm depth) of 2 to 18 kg m −2 were reported by Hopmans et al (2005) after clearfelling and burning of two Eucalyptus sites in Australia. Together, BC input rates from single fires in most of these studies are typically one to two orders of magnitude below that what we found as BC stocks though similar levels can be achieved in individual cases.…”

Section: Discussionmentioning

confidence: 79%

Mobility of black carbon in drained peatland soils

2007

View full text Add to dashboard Cite

Abstract. Amount, stability, and distribution of black carbon (BC) were studied at four sites of a large peatland ("Witzwil") formerly used as a disposal for combustion residues from households to derive BC displacement rates in the profile. Possible artefacts from thermal oxidation with Differential Scanning Calorimetry (DSC) on BC quantification of C-rich deposits were inferred by choosing three sites from a second peatland with no historical record of waste disposal as a reference ("Seebodenalp"). All sites were under grassland at time of sampling, but were partially cropped in the past at Witzwil. Mean BC contents in topsoils of Witzwil ranged from 10.7 to 91.5 (0-30 cm) and from 0.44 to 51.3 (30-140 cm) mg BC g −1 soil, corresponding to BC/OC ratios of 0.04 to 0.3 (topsoil) and 0.02 to 0.18 (deeper soil). At three sites of Seebodenalp, BC was below the detection limit of 0.4 mg g −1 organic soil, indicating negligible formation of BC during thermal oxidation of peat. 13 C NMR spectra corroborated the high BC contents at Witzwil. The data support a considerable vertical transport of BC given that soils were ploughed not deeper than 30 cm since abandonment of waste application about 50 years ago. The total amount of BC in the Witzwil profiles ranged from 3.2 to 7.5 kg BC m −2 , with 21 to 69 percent of it stemming from below the former ploughing depth. Under the premise of negligible rates of BC consumption since abandonment of waste application, minimum BC transport rates in these peats are 0.6 to 1.2 cm a −1 . The high mobility of BC might be explained by high macropore volumes in combination with occasional water saturation. By means of DSC peak temperatures, different types of BC could be distinguished, with deeper horizons containing BC of higher thermal stability. Application of combustion residues likely involved a mixture of various BC types, of which thermally more stable ones, most likely soots, were preferentially transported downwards.

show abstract

Section: Discussionmentioning

confidence: 79%

Mobility of black carbon in drained peatland soils

2007

View full text Add to dashboard Cite

show abstract

“…Conversion of 5.1% of initial mass produced 7070 kg ha −1 of charred particles >1000 µm (8.5% conversion on a C basis) during a slash-pile-and-burn experiment designed to emulate Neolithic practices in temperate deciduous forest (Eckmeier et al, 2006 2 ). Much greater increases in site charcoal (<2 mm, to 30 cm depth), of 20 000 and 170 000 kg ha −1 , were reported by Hopmans et al (2005) after clearfelling and burning of two eucalypt sites in Australia.…”

Section: Production Of Pycmentioning

confidence: 83%

“…Visual char >2 mm, to 30 cm depth b 20 000 and 170 000 kg C ha −1 Hopmans et al (2005) 4.1.2 Production determined by chemically-defined BC…”

Section: Production Of Pycmentioning

confidence: 99%

See 1 more Smart Citation

Black (pyrogenic) carbon: a synthesis of current knowledge and uncertainties with special consideration of boreal regions

2006

View full text Add to dashboard Cite

show abstract

“…Several studies in the literature show the importance of monitoring the quantity and quality of soil organic matter (SOM) so as to produce more with less intensive use of land (Souza et al, 2006;HopmanS et al, 2005;moreira and malavolta, 2004;D'anDrea et al, 2004;marcHiori Junior and melo, 2000). The microbial activity of soil and the fractions of labile SOM are considered important indicators of the sustainability of management systems (malucHe-Baretta et al, 2006;FraiSSe et al, 1999;Swezey et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of microbial biomass and organic matter labile pools in a haplic planosol soil

et al. 2010

View full text Add to dashboard Cite

The objective of this work was to study the spatial variability of soil microbial biomass (SMB) and labile soil organic matter pools (labile SOM), under different management systems and plant cover. The experiment was conducted in a Haplic Planosol soil on an Integrated Agroecological Production System (SIPA), in Seropédica, Rio de Janeiro. The evaluated management systems were: alley cropping, pasture, and bush garden, the late one was used as reference area. Three grids of regular spacing of 2.5 x 2.5 meters were used for sampling, consisting of 25 georeferenced points each, where soil samples were taken at 0-10 cm depth. The following labile constituents of soil organic matter were determined: free light fraction (FLF), water soluble C and N, C and N of SMB (SMB-C and SMB-N), and glomalin content. The textural fractions (sand, silt, and clay), pH in water, and chemical attributes (organic C, total N, Ca, Mg, Al, P, K, and CEC-cation exchange capacity) were also determined. The areas of alley cropping and pasture showed spatial dependence to the attributes of SOM. The occurrence of high spatial dependence for the attributes associated to microbial biomass in the alley cropping system (C, FLF, SMB-N and respiration), probably was due to external factors related to management, such as: intensive rotational cropping system, diversity of crops and different inputs of organic matter to soil such as pruning material and organic compost.Key words: organic carbon, geoestatistic, glomalin, precision agriculture. RESUMO VARIABILIDADE ESPACIAL DA BIOMASSA MICROBIANA E COMPARTIMENTOS LÁBEIS DA MATÉRIA ORGÂNICA DE UM PLANOSSOLO HÁPLICOO objetivo do trabalho foi estudar a variabilidade espacial da biomassa microbiana do solo (BMS) e dos constituintes lábeis da matéria orgânica do solo (MOS), sob diferentes sistemas de manejo e cobertura vegetal. O experimento foi instalado em um Planossolo Háplico no Sistema Integrado de Produção Agroecológica (SIPA), em Seropédica (RJ). Os sistemas de manejo avaliados foram: cultivo em aléias, pastagem e, horto florestal como área de referência. Para a amostragem utilizaram-se três grades regulares com espaçamento de 2,5 x 2,5 metros, composta de 25 pontos georreferenciados para cada grade, onde se coletou amostras de terra na profundidade de 0-10 cm. Em cada amostra determinaram-se os seguintes constituintes lábeis da MOS: fração leve livre, formas de C e N solúveis em água, C e N associado à BMS e teor de glomalina. Determinaram-se também as frações granulométricas areia, silte, argila, umidade gravimétrica, bem como os atributos químicos de rotina. Somente as áreas de cultivo em aléias e pastagem tiveram dependência espacial para os atributos da MOS. A ocorrência de maior dependência espacial dos parâmetros associados à BMS nas aléias (C, fração leve livre da MO, BMS-N e respiração), foi em decorrência de, provavelmente, de fatores extrínsicos relacionados ao manejo, tais como: intensa rotação e diversidade de culturas e aporte diferenciado de adubos orgânicos (material de poda ...

show abstract

Carbon and nitrogen in forest soils: Potential indicators for sustainable management of eucalypt forests in south-eastern Australia

Cited by 43 publications

References 23 publications

Mobility of black carbon in drained peatland soils

Mobility of black carbon in drained peatland soils

Black (pyrogenic) carbon: a synthesis of current knowledge and uncertainties with special consideration of boreal regions

Spatial variability of microbial biomass and organic matter labile pools in a haplic planosol soil

Contact Info

Product

Resources

About