Climate and land use controls on soil organic carbon in the loess plateau region of China.

PLoS One · 2014 · PMC4006802 · PMID 24788559

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a decreasing trendno p-value reported

In this study, the SOC changed slowly, and even had a decreasing trend in the 1960s.

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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.