Tree thinning as an option to increase herbaceous yield of an encroached semi-arid savanna in South Africa.

BMC Ecol · 2005 · PMC1164409 · PMID 15921528

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a negative trendno p-value reported

From Figure 4a there is a negative trend between ETTE ha -1 and total grass DM yield of the combined subhabitats.

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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.