Dataset: Spatiotemporal variability and origin of CO2 and CH4 tree stem fluxes in an upland forest

The exchange of multiple greenhouse gases (i.e., CO2 and CH4) between tree stems and the atmosphere represents a knowledge gap in the global carbon cycle. Stem CO2 and CH4 fluxes vary across time and space and is unclear which are their individual or shared drivers. This dataset contains information of CO2 and CH4 fluxes at different stem heights combining manual (biweekly; n=678) and automated (hourly; n>38,000) measurements in a temperate upland forest.
This study was performed in an upland forested area at the St. Jones Reserve [39°5’20”N, 75°26’21”W], a component of the Delaware National Estuarine Research Reserve (DNERR).
The dominant vegetation species are bitternut hickory (Carya cordiformis), eastern red cedar (Juniperus virginiana L.), American holly (Ilex opaca (Ashe)), sweet gum (Liquidambar styraciflua L.) and black gum (Nyssa sylvatica (Marshall)), with an overall tree density of 678 stems ha-1 and mean diameter at breast height (DBH) of 25.7±13.9 cm (mean±sd). We studied bitternut hickory, which is one of the most important species in the study site, accounting for 24.9% of the total basal area.
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