Data from: Carbon dynamics and environmental controls of a hilly tea plantation in Southeast China
Tea plantations are widely distributed and continuously expanding across subtropical China in recent years. However, carbon flux exchanges from tea plantation ecosystems are poorly understood at the ecosystem level. In this study, we use the eddy covariance technique to quantify the magnitude and te...
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Zusammenfassung: | Tea plantations are widely distributed and continuously expanding across
subtropical China in recent years. However, carbon flux exchanges from tea
plantation ecosystems are poorly understood at the ecosystem level. In
this study, we use the eddy covariance technique to quantify the magnitude
and temporal variations of the net ecosystem exchange (NEE) in tea
plantation in Southeast China over four years (2014-2017). The result
showed that the tea plantation was a net carbon sink, with an annual NEE
that ranged from -182.40 g C m-2 to -301.51 g C m-2, which was a much
lower carbon sequestration potential than other ecosystems in subtropical
China. Photosynthetic photon flux density (PPFD) explained the highest
proportion of the variation in NEE and gross primary productivity (GPP)
(for NEE: F=389.89, P < 0.01; for GPP: F=1018.04, P < 0.01),
and air temperature (Ta) explained the highest proportion of the variation
in ecosystem respiration (RE) (F=13141.81, P < 0.01). The strong
pruning activity in April not only reduced the carbon absorption capacity
but also provided many plant residues for respiration, which switched the
tea plantation to a carbon source from April to June. Suppression of NEE
at higher air temperatures was due to the decrease in GPP more than the
decrease in RE, which indicated that future global warming may transform
this subtropical tea plantation from a carbon sink to carbon source. |
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DOI: | 10.5061/dryad.r9r0vj7 |