Role of Light Fraction Soil Organic Matter in the Phosphorus Nutrition of Eucalyptus globulus Seedlings

O'Hara, Christopher; Bauhus, Jürgen; Smethurst, P. J.

doi:10.1007/s11104-005-2675-8

Cited by 18 publications

(3 citation statements)

References 38 publications

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“…As a result, the size of the LFOM pool responds much more quickly to agricultural management than the total SOM pool, and LFOM is considered to represent an early indicator to determine long term impacts of management on soil quality and C sequestration (Janzen et al 1992;Bending et al 2004; Leifeld and Kogel-Knaber 2005). Soil C, N and P mineralisation have all been correlated with LFOM, confirming that it represents an active pool of SOM with importance to plant nutrient supply (Hassink 1995;Sierra 1996;O'Hara et al 2006).…”

Section: Introductionmentioning

confidence: 73%

Incorporation of nitrogen from crop residues into light-fraction organic matter in soils with contrasting management histories

Bending

Turner

2008

Biol Fertil Soils

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Section: Introductionmentioning

confidence: 73%

Incorporation of nitrogen from crop residues into light-fraction organic matter in soils with contrasting management histories

Bending

Turner

2008

Biol Fertil Soils

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“…Mineralization of soil organic matter contributes to the supply of plant-available nutrients such as nitrogen (N) and phosphorus (P) (Compton and Boone 2002;O'Hara et al 2006;Tiessen et al 2004). Most soils contain a large pool of stable organic matter and a smaller pool of actively cycling organic matter derived from recent inputs of plant, microbial, and animal residues (Sollins et al 1984).…”

Section: Introductionmentioning

confidence: 99%

Impacts of plantation forest management on soil organic matter quality

et al. 2011

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Purpose Light fraction soil organic matter is characterized by rapid mineralization due to the labile nature of its chemical constituents and to the lack of protection by soil colloids. The changes in the size of light fraction soil organic matter constituents are useful early indicators of management-related carbon (C) and nutrient changes. However, previous studies have not assessed the impacts of forest management practices on the chemical composition and sources of organic matter in the light fraction. The change in the chemistry of light fraction soil organic matter may significantly affect turnover rate of organic matter in the whole soil and soil fertility. The aim of this study was to assess how different forest management practices would affect the chemical composition of light fraction soil organic matter. Materials and methods Soils in 0-5, 5-15, and 15-25-cm layers were sampled in 2009 from a 19-year-old secondrotation Pinus radiata D. Don plantation. Soils were subject to four different treatment combinations (stem-only and whole-tree harvesting residue management treatments were combined with the presence or absence of nitrogen (N)). The soil was physically separated into two pools based on density fractionation. The C and N concentrations in the whole soil, light, and heavy fractions were determined. Light fraction soil organic matter in upper soil (0-5 cm depth) was analyzed by solid-state CPMAS 13 C NMR and GC/MS to determine the effects of forest management practices on the composition of organic C functional groups and the relative abundance of plant biomarkers. Results and discussion Long-term fertilization did not affect the C and N concentrations in the whole soil, light and heavy fractions, but increased the relative enrichment of alkyl C and alkyl-to-O-alkyl C ratio in the light fraction soil organic matter at the 0-5 cm depth, which may suggest increased decomposition of the light fraction. The relative abundance of cutin-derived compounds, which originate from the waxy coating of leaves, was greater in the light fraction soil organic matter in the fertilized plots than in the unfertilized plots. The relative abundance of major carbohydrates, labile components in the light fraction soil organic matter, decreased in the fertilized plots despite greater inputs from forest litter, compared to that in the unfertilized plots. Compared with whole-tree harvest plots, stem-only harvest plots had greater C concentrations in the light fraction soil organic matter at 0 to 25-cm layer and seemed to have a greater alkyl-to-O-alkyl ratio in the light fraction of soil organic matter, but the difference in alkyl-to-O-alkyl ratio due to harvest residue management was not significant (P<0.05) at the 0-5 cm depth. Post-harvesting residue management did not significantly affect functional organic C groups as analyzed by CPMAS 13 C NMR, or the relative abundance of cutin, suberin, lignin-derived compounds or major carbohydrates determined by GC/MS. Conclusions The analyses of light fraction soil organic matte...

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“…The organic C in the soil is not a uniform material (O'Hara et al, 2006) but rather a complex mixture of plant, animal and microbial residues in various stages of decomposition (Post and Kwon, 2000). The soil organic carbon (SOC) in light fraction (LF, with density <1.7 g/cm 3 ; LF organic carbon, LF-OC) is a component that commonly refers to relatively fresh, free or not well protected organic debris (Six et al, 2002;O'Hara et al, 2006) with high decomposability (Post and Kwon, 2000). In contrast, the SOC in heavy fraction (HF, with density >1.7 g/cm 3 ; HF organic carbon, HF-OC) represents the comparatively decomposed component.…”

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confidence: 99%

Conventional tillage improves the storage of soil organic carbon in heavy fractions in the Loess Plateau, China

Han

Niu

et al. 2015

J. Arid Land

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Soil labile organic carbon (C) plays an important role in improving soil quality. The relatively stable fractions of soil organic C (SOC) represent the bulk of SOC, and are also the primary determinant of the long-term C balance of terrestrial ecosystems. Different land use types can influence the distribution patterns of different SOC fractions. However, the underlying mechanisms are not well understood. In the present study, different fractions of SOC were determined in two land use types: a grazed grassland (established on previously cultivated cropland 25 years ago, GG) and a long-term cultivated millet cropland (MC). The results showed that C concentration and C storage of light fractions (LF) and heavy fractions (HF) presented different patterns along the soil profiles in the two sites. More plant residues in GG resulted in 91.9% higher LF storage at the 0-10 cm soil depth, further contributed to 21.9% higher SOC storage at this soil depth; SOC storage at 20-60 cm soil depth in MC was 98.8% higher than that in GG, which could be mainly attributed to the HF storage 104.5% higher than in GG. This might be caused by the long-term application of organic manure, as well as the protection from plough pan and silt-and clay-sized particles. The study indicated that different soil management practices in this region can greatly influence the variations of different SOC fractions, while the conventional tillage can greatly improve the storage of SOC by increasing heavy fractions.

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Role of Light Fraction Soil Organic Matter in the Phosphorus Nutrition of Eucalyptus globulus Seedlings

Cited by 18 publications

References 38 publications

Incorporation of nitrogen from crop residues into light-fraction organic matter in soils with contrasting management histories

Incorporation of nitrogen from crop residues into light-fraction organic matter in soils with contrasting management histories

Impacts of plantation forest management on soil organic matter quality

Conventional tillage improves the storage of soil organic carbon in heavy fractions in the Loess Plateau, China

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