Foliar and soil N and δ N as restoration metrics at Pūtaringamotu Riccarton Bush, Christchurch city.

Autor: Hawke, D. J., Cranney, O. R., Horton, T. W., Bury, S. J., Brown, J. C. S., Holdaway, R. N.
Předmět:
Zdroj: Journal of the Royal Society of New Zealand; Dec2017, Vol. 47 Issue 4, p319-335, 17p
Abstrakt: Delta15N values and associated N concentrations may be useful nutrient cycling metrics for assessing restoration progress, and complement biodiversity assessment. We tested this hypothesis at Pūtaringamotu Riccarton Bush (‘Pūtaringamotu’), a low-rainfall urban forest fragment under restoration since 1974. Foliar and soil measurements came from four indigenous forests (Pūtaringamotu; Saltwater, high rainfall, logged until 2002; Ōkārito, high rainfall, never logged; Scotchman’s Creek, high rainfall, burrowing seabirds present). Despite different disturbance histories, Pūtaringamotu, Ōkārito and Saltwater results all fitted globalδ15N regressions between rainfall and foliar N concentration. Enhanced foliar N concentrations accompanying low rainfall at Pūtaringamotu were similar to seabird-affected Scotchman’s Creek. Although Pūtaringamotu foliarδ15N values showed differences between taxa, they were less pronounced than for Ōkārito; Saltwater showed no effect. Further investigation of nutrient cycling restoration metrics at Pūtaringamotu should therefore emphasise progressive development of differences in foliarδ15N between plant taxa, pooled values being insufficiently sensitive. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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