Long-term vegetation restoration increases deep soil carbon storage in the Northern Loess Plateau.

Sci Rep · 2021 · PMC8253830 · PMID 34215791

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a decreasing trendno p-value reported

Like many other studies, the SOC for all land uses demonstrated a decreasing trend with soil depth 21 , 28 , 34 .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.