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Tree carbon (C) uptake (net primary productivity excluding fine root turnover, NPP′) in a New Zealand  Pinus radiata  D. Don plantation (42°52′ S, 172°45′ E) growing in a region subject to summer soil water deficit was investigated jointly with canopy assimilation ( A  c ) and ecosystem–atmosphere C exchange rate (net ecosystem productivity, NEP). Net primary productivity was derived from biweekly stem diameter growth measurements using allometric relations, established after selective tree harvesting, and a litterfall model. Estimates of  A  c  and NEP were used to drive a biochemically based and environmentally constrained model validated by seasonal eddy covariance measurements. Over three years with variable rainfall, NPP′ varied between 8.8 and 10.6 Mg C ha −1  year −1 , whereas  A  c  and NEP were 16.9 to 18.4 Mg C ha −1  year −1  and 5.0–7.2 Mg C ha −1  year −1 , respectively. At the end of the growing season, C was mostly allocated to wood, with nearly half (47%) to stems and 27% to coarse roots. On an annual basis, the ratio of NEP to stand stem volume growth rate was 0.24 ± 0.02 Mg C m −3 . The conservative nature of this ratio suggests that annual NEP can be estimated from forest yield tables.

Net ecosystem productivity, net primary productivity and ecosystem carbon sequestration in a Pinus radiata plantation subject to soil water deficit