Nevertheless, our Amazon and African samples are non-randomly distrib- uted. It is possible to test whether this spatial bias might be driving the result by assessing whether we have oversampled unusually heavily in regions that happened to gaining biomass, and under-sampled those that happened to lose biomass.
At smaller scales this is unlikely, since the long-term mean net gain in Amazonia is almost identical whether the sampling unit is taken to be the'plot' (as here), or a larger unit such as a landscape cluster of plots' in both Amazonia and Africa(Phillips et al. 2009: Lewis et al. 2004b: 2009a At larger scales, while the networks still leave large expanses of Brazilian Amazonia and the Central Congo Basin
unsampled(Figure 4.1), the climate- and soil environmental space is well covered(Figure 4.2). Greater monitoring efforts in the difficult-to-access regions are of course needed to reduce the uncer- tainty due to incomplete spatial coverage.
Nevertheless, our Amazon and African samples are non-randomly distrib- uted. It is possible to test whether this spatial bias might be driving the result by assessing whether we have oversampled unusually heavily in regions that happened to gaining biomass, and under-sampled those that happened to lose biomass.At smaller scales this is unlikely, since the long-term mean net gain in Amazonia is almost identical whether the sampling unit is taken to be the'plot' (as here), or a larger unit such as a landscape cluster of plots' in both Amazonia and Africa(Phillips et al. 2009: Lewis et al. 2004b: 2009a At larger scales, while the networks still leave large expanses of Brazilian Amazonia and the Central Congo Basinunsampled(Figure 4.1), the climate- and soil environmental space is well covered(Figure 4.2). Greater monitoring efforts in the difficult-to-access regions are of course needed to reduce the uncer- tainty due to incomplete spatial coverage.
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