Nitrous oxide emission factors for urine and dung patches in a subtropical Brazilian pastureland

Effect of Dung Quantity and Quality on Greenhouse Gas Fluxes From Tropical Pastures in Kenya

“…This difference from the previous study might be related to the high altitude of Nairobi (~1,850 m asl), which results in relatively low humidity and higher solar radiation causing quick drying of dung irrespective of the weight of the dung. The N 2 O EF was similarly not affected by dung weight, consistent with a study undertaken in Brazil by Sordi et al ().…”

Sheep Excreta as Source of Nitrous Oxide in Ryegrass Pasture in Southern Brazil

“…But, the EF estimated here is much lower than the default EF of the N deposited by sheep during grazing of 1 % proposed by the IPCC (2013) and the EF of 0.25 % for dung deposited on grazed pastures in New Zealand (Ministry for the Environment, 2012). This result suggests that excreta, urine and dung, should be separately addressed in national greenhouse gas inventories or communications, corroborating the results of Sordi et al (2014) working with cattle excreta. Due to lack of regional EF values for the South of Brazil, the EF value of 1 % established by the IPCC is adopted in national inventories and potentially overestimates the N 2 O emissions from pastures.…”

“…Soil bulk density and total porosity were measured in cores collected in soil sampling rings of 0.085-m diameter and 0.050-m height. Water-filled pore space (WFPS) was calculated considering gravimetric soil moisture, soil bulk density, and total porosity (Sordi et al, 2014). Rainfall and daily mean air temperature data were recorded in a meteorological station located 500 m away from the study site and are shown in figure 1.…”

The interactive effects of fertiliser nitrogen with dung and urine on nitrous oxide emissions in grassland

“…Urine patches in pastures rank among the highest sources of N 2 O emission from animal production systems (van Groenigen et al, 2005b) and grazing animals have been identified as significant contributors to the global N 2 O budget (Oenema et al, 1997). The effect of urine on N 2 O emissions has been investigated using artificial urine (Anger et al, 2003;de Klein and van Logtestijn, 1994;Clough et al, 1996), in controlled laboratory conditions (Monaghan and Barraclough, 1993;van Groenigen et al, 2005a), on lysimeters (Selbie et al, 2014) and in field studies with real urine (Krol et al, 2015;Sordi et al, 2013;de Klein et al, 2003). The contribution of dung patches to N 2 O emissions have also been investigated (Flessa et al, 1996;Allen et al, 1996;Yamulki et al, 1998;van der Weerden et al, 2011;Sordi et al, 2013).…”

“…The effect of urine on N 2 O emissions has been investigated using artificial urine (Anger et al, 2003;de Klein and van Logtestijn, 1994;Clough et al, 1996), in controlled laboratory conditions (Monaghan and Barraclough, 1993;van Groenigen et al, 2005a), on lysimeters (Selbie et al, 2014) and in field studies with real urine (Krol et al, 2015;Sordi et al, 2013;de Klein et al, 2003). The contribution of dung patches to N 2 O emissions have also been investigated (Flessa et al, 1996;Allen et al, 1996;Yamulki et al, 1998;van der Weerden et al, 2011;Sordi et al, 2013). Recent approaches have focused on generating 'disaggregated' emission factors for dung and urine (van der Weerden et al, 2011).…”