A comment on scaling methane emissions from vegetation and grazing ruminants in New Zealand

Functional Plant Biology : FPB
Francis M KelliherGerald Rys

Abstract

Keppler et al. (2006, Nature 439, 187-191) showed that plants produce methane (CH4) in aerobic environments, leading Lowe (2006, Nature 439, 148-149) to postulate that in countries such as New Zealand, where grazed pastures have replaced forests, the forests could have produced as much CH4 as the ruminants currently grazing these areas. Estimating CH4 emissions from up to 85 million ruminants in New Zealand is challenging and, for completeness, the capacity of forest and pastoral soils to oxidise CH4 should be included. On average, the CH4 emission rate of grazing ruminants is estimated to be 9.6 ± 2.6 g m-2 year-1 (±standard deviation), six times the corresponding estimate for an indigenous forest canopy (1.6 ± 1.1 g m-2 year-1). The forest's soil is estimated to oxidise 0.9 ± 0.2 g m-2 year-1 more CH4 than representative soils beneath grazed pasture. Taking into account plant and animal sources and the soil's oxidative capacity, the net CH4 emission rates of forest and grazed ecosystems are 0.6 ± 1.1 and 9.8 ± 2.6 g m-2 year-1, respectively.

References

Aug 19, 2005·Nature·Martin R ManningWilliam Allan
Jan 13, 2006·Nature·David C Lowe
Jan 13, 2006·Nature·Frank KepplerThomas Röckmann
Feb 1, 1994·Environmental Science & Technology·K JohnsonP Zimmerman
Jun 1, 2006·Functional Plant Biology : FPB·Miko U F KirschbaumAnthony J Winters

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Citations

Oct 6, 2009·New Zealand Veterinary Journal·C S Pinares-PatinoS O Hoskin

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