Water use efficiency in a primary subtropical evergreen forest in Southwest China.

ABSTRACT: We calculated water use efficiency (WUE) using measures of gross primary production (GPP) and evapotranspiration (ET) from five years of continuous eddy covariance measurements (2009-2013) obtained over a primary subtropical evergreen broadleaved forest in southwestern China. Annual mean WUE exhibited a decreasing trend from 2009 to 2013, varying from ~2.28 to 2.68 g C kg H₂O^-1. The multiyear average WUE was 2.48 ± 0.17 (mean ± standard deviation) g C kg H₂O^-1. WUE increased greatly in the driest year (2009), due to a larger decline in ET than in GPP. At the diurnal scale, WUE in the wet season reached 5.1 g C kg H₂O^-1 in the early morning and 4.6 g C kg H₂O^-1 in the evening. WUE in the dry season reach

SUBMITTER: Song QH 

PROVIDER: S-EPMC5316949 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature