What question did this study set out to answer?

To isolate particulate organic matter using a dispersion method and evaluate its turnover dynamics relative to mineral-associated carbon across different cultivation treatments in native grassland soils.

May 1, 1992Soil Science Society of America Journal

Particulate Soil Organic‐Matter Changes across a Grassland Cultivation Sequence

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Authors

CCCynthia A. CambardellaNational Laboratory for Agriculture and the Environment EEEdward T. ElliottUniversity of Nebraska–Lincoln

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Implication

Comparative study demonstrates cultivation depletes particulate soil organic matter in grassland soils, indicating its role as a sensitive intermediate turnover pool.

Key Points

To isolate particulate organic matter using a dispersion method and evaluate its turnover dynamics relative to mineral-associated carbon across different cultivation treatments in native grassland soils.
Dispersed soil samples using 5 g L⁻¹ hexametaphosphate and passed them through a 53-µm sieve to isolate the particulate organic matter (POM) fraction.
Compared POM and mineral-associated carbon across native grassland and three 20-year cultivation regimes: bare-fallow, stubble-mulch, and no-till management.
Analyzed the POM fraction for lignin content, cellulose content, and stable carbon-isotope composition.
POM carbon accounted for 39% of total soil organic carbon in native sod, but decreased to 18% in bare-fallow, 19% in stubble-mulch, and 25% in no-till systems.
Mineral-associated organic carbon showed no decrease under bare-fallow compared with native sod, and increased in both stubble-mulch and no-till treatments.
The POM fraction contained 47% lignin with a lignocellulose index of 0.7, and stable carbon isotopes indicated wheat-derived POM turns over faster than grass-derived POM.

Cite This Study

Cambardella et al. (1992) studied this question.

synapsesocial.com/papers/69d8140d05ee2ba81dbef018 https://doi.org/10.2136/sssaj1992.03615995005600030017x

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Implication

Comparative study demonstrates cultivation depletes particulate soil organic matter in grassland soils, indicating its role as a sensitive intermediate turnover pool.

Particulate Soil Organic‐Matter Changes across a Grassland Cultivation Sequence

Discussion

Member takes

Implication

Key Points

Cite This Study

Particulate Soil Organic‐Matter Changes across a Grassland Cultivation Sequence

Discussion

Member takes

Implication

Key Points

Cite This Study

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