Effects of Spartina alterniflora invasion on soil respiration in the Yangtze River estuary, China.

PLoS One · 2015 · PMC4370568 · PMID 25799512

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may not be significantno p-value reported

Finally, although increased soil moisture can restrict O 2 diffusion from the atmosphere into the soil [ 39 ], this negative effect on soil respiration may not be significant.

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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.