Ecosystem services changes between 2000 and 2015 in the Loess Plateau, China: A response to ecological restoration.

PLoS One · 2019 · PMC6349322 · PMID 30689646

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an increasing trendno p-value reported

During this period, average annual water regulation amount was about 16.52 billion m 3 /yr, with an increasing trend of 0.21 billion m 3 /yr.

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a decreasing trendno p-value reported

Sand fixation showed a decreasing trend mainly because of decreased wind speeds.

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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.