Nitrous oxide emissions from drained peat soil beneath pasture.

Autor:	Kelliher, FM, van Koten, C, Lindsey, SB, Wise, B, Rys, G
Předmět:	NITROUS oxide PEAT soils NITROGEN fertilizers TIME series analysis DISTRIBUTION (Probability theory) SKEWNESS (Probability theory)
Zdroj:	New Zealand Journal of Agricultural Research; Dec2016, Vol. 59 Issue 4, p363-376, 14p
Abstrakt:	Nitrous oxide (N2O) emissions (EN2O) from drained peat soils used for pastoral agriculture have not been measured throughout the year in New Zealand. In response to this research gap, EN2Owas measured fortnightly for 1 year in the Waikato region in a plot that was not grazed or nitrogen (N) fertilised. The time series was variable, the frequency distribution skewed and the fortnightly means correlated. To account for these factors, the data were logetransformed and an order 2 autoregressive model used to estimate a mean EN2Oof 4.3 g N ha−1 d−1and 95% confidence limits of 0.6–29.1 g N ha−1 d−1. There was a statistically significant, inverse relationship between EN2Oand the depth to groundwater. In winter, when rainfall totalled 393 mm, EN2Oand soil N content were significantly greater under a rain shelter designed to minimise N loss by leaching, than in an uncovered plot. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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