Study on hydrological functions of litter layers in North China.

PLoS One · 2013 · PMC3728107 · PMID 23936188

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showed a trendno p-value reported

By contrast, the needle leaf litter showed a trend to decrease, increase, and then markedly decrease when the rainfall intensity increased gradually from 6.7 to 115 mm h –1 .

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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.