Search results for: J.A. Baldock

Items from 1 to 17 out of 17 results

article

Catchment scale mapping of measureable soil organic carbon fractions

S.B. Karunaratne, T.F.A. Bishop, J.A. Baldock, I.O.A. Odeh

Geoderma > 2014 > 219-220 > Complete > 14-23

This study aims to map the measurable fractions of soil organic carbon related to the RothC carbon model at the catchment scale and to assess the model and prediction quality. It also discusses how the outputs can be used to provide initial pool estimates for process modelling of soil carbon in a spatial context. The study was carried out in Cox's Creek catchment in northern New South Wales, Australia...

article

The sorption of organic carbon onto differing clay minerals in the presence and absence of hydrous iron oxide

A.R. Saidy, R.J. Smernik, J.A. Baldock, K. Kaiser, more

Geoderma > 2013 > 209-210 > Complete > 15-21

Sorption of organic carbon onto phyllosilicate clays and hydrous iron oxides influences the accumulation and stabilisation of organic carbon in soils. However, the effects of interactions between hydrous iron oxides and phyllosilicate clays on the sorption of dissolved organic carbon (DOC) are poorly understood. We carried out a batch experiment to examine the effects of goethite coatings on kaolinite,...

article

Soil organic carbon contributes to alkalinity priming induced by added organic substrates

F. Rukshana, C.R. Butterly, J.M. Xu, J.A. Baldock, more

Soil Biology and Biochemistry > 2013 > 65 > Complete > 217-226

Organic substrate input stimulates mineralisation of native soil organic matter, resulting in CO ₂ priming. Our previous studies showed that such CO ₂ priming enhanced alkalinity release but the mechanisms behind this are unknown. This study used ¹⁴ C-labelled compounds to investigate the effect of added organic compounds on decomposition of soil organic matter and how this...

article

Acid hydrolysis to define a biologically-resistant pool is compromised by carbon loss and transformation

L.G. Greenfield, E.G. Gregorich, C. van Kessel, J.A. Baldock, more

Soil Biology and Biochemistry > 2013 > 64 > Complete > 122-126

Biologically-resistant carbon (C) comprises the bulk of C in most soils and is often estimated from chemical separation of a soil organic matter (SOM) fraction that is not hydrolysed by strong acid, and exhibits an older radiocarbon age and slower turnover than the whole SOM. Here we examine the effects of acid hydrolysis – the method used to separate the nonhydrolysable C – on the quantity, structure...

article

The link between peat hydrology and decomposition: Beyond von Post

S.P.P. Grover, J.A. Baldock

Journal of Hydrology > 2013 > 479 > Complete > 130-138

Hydrology is central to the formation, growth and utilisation of peat soils. However, peat presents a difficult medium in which to measure hydrologic properties, due to its soft structure and high water content. The von Post scale is a widely used measure of the extent of decomposition of peat, which can be applied in the field or the laboratory without specialised equipment. von Post decomposition...

article

Model organic compounds differ in priming effects on alkalinity release in soils through carbon and nitrogen mineralisation

F. Rukshana, C.R. Butterly, J.A. Baldock, J.M. Xu, more

Soil Biology and Biochemistry > 2012 > 51 > Complete > 35-43

The influence of organic matter and its cycling on soil pH change is still unclear. This study investigated the effect of organic compounds on carbon and nitrogen dynamics and their relationship with pH changes in two soils differing in initial soil pH (Podosol of pH 4.5 and Tenosol of pH 6.2). Seven organic compounds representing common compounds in decomposing plant residues or root exudates were...

article

Effects of clay mineralogy and hydrous iron oxides on labile organic carbon stabilisation

A.R. Saidy, R.J. Smernik, J.A. Baldock, K. Kaiser, more

Geoderma > 2012 > 173-174 > Complete > 104-110

Stabilisation of soil organic carbon (SOC) is known to be affected by chemical adsorption of organic carbon onto clay minerals and iron or aluminium hydrous-oxides. However, little information is available on the relative effects of different clay minerals in the presence or absence of different hydrous oxides. We examined organic carbon stabilisation in an incubation experiment involving kaolinitic,...

article

Carbon pulses but not phosphorus pulses are related to decreases in microbial biomass during repeated drying and rewetting of soils

C.R. Butterly, E.K. Bünemann, A.M. McNeill, J.A. Baldock, more

Soil Biology and Biochemistry > 2009 > 41 > 7 > 1406-1416

Drying and rewetting cycles are known to be important for the turnover of carbon (C) in soil, but less is known about the turnover of phosphorus (P) and its relation to C cycling. In this study the effects of repeated drying-rewetting (DRW) cycles on phosphorus (P) and carbon (C) pulses and microbial biomass were investigated. Soil (Chromic Luvisol) was amended with different C substrates (glucose,...

article

Habitat selective factors influencing the structural composition and functional capacity of microbial communities in agricultural soils

S.A. Wakelin, L.M. Macdonald, S.L. Rogers, A.L. Gregg, more

Soil Biology and Biochemistry > 2008 > 40 > 3 > 803-813

Key physicochemical factors associated with microbial community composition and functions in Australian agricultural soils were identified. Soils from seven field sites, with varying long-term agricultural management regimes, were characterised physicochemically, on the basis of their bacterial and fungal community structures (using PCR-DGGE), and by assessing potential catabolic functions (MicroResp™)...

article

The effect of landuse on soil organic carbon chemistry and sorption of pesticides and metabolites

D.P. Oliver, J.A. Baldock, R.S. Kookana, S. Grocke

Chemosphere > 2005 > 60 > 4 > 531-541

Earlier studies had shown significant differences in sorption of nine pesticides in soils collected from two landuses (native vegetation and market gardens), which could not be explained on the basis of organic carbon content alone. Consequently it was hypothesised that the differences in sorption behaviour between the two landuses may be due to variation in the chemistry of the organic carbon. In...

article

Decomposition dynamics of plant materials in relation to nitrogen availability and biochemistry determined by NMR and wet-chemical analysis

W.J. Wang, J.A. Baldock, R.C. Dalal, P.W. Moody

Soil Biology and Biochemistry > 2004 > 36 > 12 > 2045-2058

Improved understanding of the interactive relationships of plant material decomposition kinetics to biochemical characteristics and nitrogen availability is required for terrestrial C accounting and sustainable land management. In this study, 15 typical and/or native Australian plant materials were finely ground and incubated with a sandy soil at 25°C and 55% water holding capacity without nitrogen...

article

Cycling and composition of organic matter in terrestrial and marine ecosystems

J.A. Baldock, C.A. Masiello, Y. Gélinas, J.I. Hedges

Marine Chemistry > 2004 > 92 > 1-4 > 39-64

Decomposing natural organic matter found in terrestrial and marine environments consists of a heterogenous mixture of particles and molecules with variable physical and chemical properties. The amount of organic matter present in these systems is controlled by the relative rates of accumulation and loss. Accumulation is controlled principally by net primary productivity whilst losses are mainly a...

article

Fixed nitrogen in sustainable farming systems: a symposium examining factors influencing the extent of biological nitrogen fixation and its role in southern Australian agricultural systems. Setting the scene

J.A. Baldock, R.A. Ballard

Soil Biology and Biochemistry > 2004 > 36 > 8 > 1191-1193

article

The biochemical and elemental compositions of marine plankton: A NMR perspective

J.I. Hedges, J.A. Baldock, Y. Gélinas, C. Lee, more

Marine Chemistry > 2002 > 78 > 1 > 47-63

The traditional Redfield-Ketchum-Richards (1963) equation for the production (or respiration) of ''average marine plankton''106CO ₂ +16HNO ₃ +H ₃ PO ₄ +122H ₂ O=(CH ₂ O) ₁ ₀ ₆ (NH ₃ ) ₁ ₆ (H ₃ PO ₄ )+1 38O ₂ has long been a useful guideline for establishing the ratios and reaction extents of...

article

Role of the soil matrix and minerals in protecting natural organic materials against biological attack

J.A. Baldock, J.O. Skjemstad

Organic Geochemistry > 2000 > 31 > 7-8 > 697-710

Natural organic materials in soils consist of a complex mixture of different biochemicals exhibiting numerous morphologies and stages of biological oxidation. A continuum of decomposability exists based on chemical structure; however, this continuum can be altered by interactions with minerals within matrices capable of stabilising potentially labile organic matter against biological oxidation. Protection...

article

The effects of vegetation and burning on the chemical composition of soil organic matter in a volcanic ash soil as shown by ¹ ³ C NMR spectroscopy. I. Whole soil and humic acid fraction

A. Golchin, P. Clarke, J.A. Baldock, T. Higashi, more

Geoderma > 1997 > 76 > 3-4 > 155-174

Soil samples were collected from the surface mineral horizon (Ah horizon) of four adjacent soils (sites I, II, III, IV) and one remote soil (site V) derived from volcanic ash in Japan. The four adjacent sites were managed as Miscanthus sinensis grassland for several hundred years by the use of annual burning to prevent the regrowth of native forest species. At site I, annual burning was still being...

article

The effects of vegetation and burning on the chemical composition of soil organic matter of a volcanic ash soil as shown by ¹ ³ C NMR spectroscopy. II. Density fractions

A. Golchin, J.A. Baldock, P. Clarke, T. Higashi, more

Geoderma > 1997 > 76 > 3-4 > 175-192

Soil samples from the surface mineral horizons (Ah) of two adjacent sites (sites I and III) and one remote site (site V), derived from volcanic ash in Japan, were collected and separated into fractions with densities < 1.0 free, < 1.6 free, < 1.6 occluded, 1.6-1.8, 1.8-2.0 and > 2.0 Mg m ^- ³ . The terms free and occluded were used to indicate density fractions in which organic...

Filter options

Publication date

Set your own date range

Content availability

Available (15)
None (2)

Keywords

DECOMPOSITION (5)
SOIL ORGANIC MATTER (4)
1 3 C CP/MAS NMR (2)
ALKALINITY PRIMING (2)
ANDOSOL (2)
BURNING (2)
CARBON (2)
NMR (2)
PROTON-SPIN RELAXATION EDITING (PSRE) (2)
1 3 C (1)
13C (1)
13C NMR (1)
14C-GLUCOSE (1)
14C-MALIC ACID (1)
ACID HYDROLYSIS (1)
ACIDIFICATION (1)
ACIDITY (1)
AUSTRALIA (1)
BACTERIA (1)
BINDING MECHANISMS (1)
BIOCHEMICAL (1)
BIOLOGICAL OXIDATION (1)
BLOCH DECAY (1)
BLOCH DECAY NMR (1)
CARBON CYCLE (1)
CARBON FRACTIONS (1)
CARBON MINERALISATION (1)
CATABOLIC FUNCTION (1)
CLAY MINERALOGY (1)
CO2 PRIMING (1)
COMMUNITY STRUCTURE (1)
CONCEPTUAL POOLS (1)
CP/MAS 13C NMR (1)
DENSITY FRACTION (1)
DIGITAL SOIL MAPPING (1)
DRYING–REWETTING (1)
ELECTROSTATIC INTERACTION (1)
ELEMENTAL (1)
FAME (1)
FUNGI (1)
HUMIC ACID (1)
HYDRAULIC CONDUCTIVITY (1)
HYDROUS IRON OXIDE (1)
INDIGENOUS ORGANIC MATTER (1)
INDIGENOUS SOIL ORGANIC MATTER (1)
INITIAL SOIL PH (1)
LIGNIN (1)
MARINE PLANKTON (1)
MARINE SEDIMENT (1)
MARINE WATER COLUMN (1)
MICROBIAL BIOMASS (1)
MICROBIAL ECOLOGY (1)
MICRORESP™ (1)
MINERALISATION (1)
MOLECULAR MIXING MODEL (1)
NITROGEN (1)
NITROGEN CYCLE (1)
NITROGEN TRANSFORMATION (1)
NUCLEAR MAGNETIC RESONANCE (1)
ORGANIC MATTER (1)
PCR-DGGE (1)
PEAT (1)
PHOSPHORUS AND CARBON PULSE (1)
PHOTOSYNTHESIS (1)
PHYSICAL PROTECTION (1)
REDFIELD RATIOS (1)
RESISTANT POOL (1)
RESPIRATION (1)
SOIL (1)
SOIL CARBON STABILISATION (1)
SOIL MINERALOGY (1)
SOIL PH (1)
SOIL RESPIRATION (1)
SOIL TEXTURE (1)
SPATIAL MODELLING (1)
SURFACE AREA (1)
SURFACE AREAS (1)
TWO-POOL MODEL (1)
UNCERTAINTY (1)
WATER YIELD (1)
more

INFONA - science communication portal

Search results for: J.A. Baldock

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Keywords

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options