Dynamics and sources of soil organic C following afforestation of croplands with poplar in a semi-arid region in northeast China.

PLoS One · 2014 · PMC3900571 · PMID 24466183

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an increasing trendno p-value reported

[38] also observeed that SOC stocks in 0–10 cm layer had an increasing trend along a choronosequence of poplar plantations in the Columbia Plateau, Oregon, USA.

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