20181108
Author :
Stevenson, Bryan A
Parfitt, RL
Schipper, Louis A
Baisden, W Troy
Mudge, P
Stevenson, Bryan A
Parfitt, RL
Schipper, Louis A
Baisden, W Troy
Mudge, P
Title : Relationship between soil δ15N, C/N and N losses across land uses in New Zealand
Journal : Agriculture, ecosystems & environment
Comment :
Several of the major processes that result in N loss from soil (nitrification, ammonia volatilization, and denitrification) discriminate against 15N and fractionate the stable N isotopes, thus δ15N of ecosystem components has been suggested as an indicator of ecosystem N leakiness.
Mean soil δ15N differed between land uses with intensively managed cropping having the highest mean soil δ15N (6.2‰) followed by dairy (5.4‰), drystock (3.8‰), forestry (2.8‰) and indigenous forests (2.1‰). Over all land uses there was a negative correlation between δ15N and the soil C/N ratio (p =−0.73) and regression analysis indicated a relatively strong linear relationship between δ15N and C/N (r2 = 0.56, P < 0.001) when cropping sites (where significant loss of soil C had occurred), and sites with C/N ratio >18 were excluded.
Comment :
Several of the major processes that result in N loss from soil (nitrification, ammonia volatilization, and denitrification) discriminate against 15N and fractionate the stable N isotopes, thus δ15N of ecosystem components has been suggested as an indicator of ecosystem N leakiness.
Mean soil δ15N differed between land uses with intensively managed cropping having the highest mean soil δ15N (6.2‰) followed by dairy (5.4‰), drystock (3.8‰), forestry (2.8‰) and indigenous forests (2.1‰). Over all land uses there was a negative correlation between δ15N and the soil C/N ratio (p =−0.73) and regression analysis indicated a relatively strong linear relationship between δ15N and C/N (r2 = 0.56, P < 0.001) when cropping sites (where significant loss of soil C had occurred), and sites with C/N ratio >18 were excluded.
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