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Science. 2011 Aug 26;333(6046):1093; author reply 1093. doi: 10.1126/science.1199544.

Comment on "Drought-induced reduction in global terrestrial net primary production from 2000 through 2009".

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  • 1Department of Biological Sciences, Macquarie University, North Ryde NSW 2109, Australia.


Zhao and Running (Reports, 20 August 2010, p. 940) reported that global net primary production has declined over the past decade and that this reduction was caused by drought. However, their findings are not direct measurements, but rather are based on outcomes from models in which a strong temperature dependence is assumed. I examine the assumptions underlying their results and show that their findings can be explained as logical consequences of these assumptions.

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