Investigating the relationship between tree stem respiration and growth rate

Description: This study was conducted at the Maliau Basin Conservation area (4.747°, 116.970°) in an old-growth forest, the Belian plot. The sample consisted of ten trees of variety of species and a range of growth rates. Sampling took place over 3 consecutive days (18/02/2020 - 20/02/2020) to compile a 24-hour cycle due to logistical constrains impeding continuous measurement. Stem Respiration was measured hourly using a closed chamber EGM-4 Infrared Gas Analyser. Each tree has a 5cm long PVC collar with a 10.6cm internal diameter sealed with glue at 1.1m height. For each measurement, the chamber was flushed and collar fanned to remove stagnant air. The chamber was then sealed onto the PVC collar and Rs measured for 120 seconds. The raw measurements provides CO2 concentration (ppm), the results were then downloaded and filtered to remove initial stabilisation period and outliers using the R package "egm_r_tools" (see https://github.com/davidorme/egm_r_tools), with the ideal measurement being a linear slope with minimal residuals. The filtered efflux slope for each tree was then scaled to hourly and summed to give a daily total per tree. Out of the 24-hour period, two hour slots were missing (14:00 and 04:00) due to logistical constraints . Project: This dataset was collected as part of the following SAFE research project: MRes Tropical Forest Ecology Field Course XML metadata: GEMINI compliant metadata for this dataset is available here Files: This consists of 1 file: Stem_Resp_TFE2020.xlsx Stem_Resp_TFE2020.xlsx This file contains dataset metadata and 4 data tables: Respiration_data_corrected (described in worksheet Respiration_data_corrected) Description: 24 hour observations of CO2 flux patterns corrected using egm-r-tools R package Number of fields: 7 Number of data rows: 240 Fields: date: Calendar date (Field type: date) hour: Hour in which the measurement was taken and represents (Field type: time) tree_tag: ID number of tree sampled (Field type: id) corrected_flux: EGM corrected flux using egm_r_tools R package (Field type: numeric) subplot: Subplot number within Belian Plot (Field type: id) Subplot_code: Subplot (Field type: location) EGM_unit: Number of EGM unit used (Field type: id) Respiration_data_uncorrected (described in worksheet Respiration_data_uncorrected) Description: Raw uncorrected 24 hour observations of CO2 flux patterns from EGM machine Number of fields: 5 Number of data rows: 219 Fields: date: Calendar date (Field type: date) Time: time respiration measurement was taken (Field type: time) tree_tag: ID number of tree sampled (Field type: id) EGM_Record_No: file number of measurement taken on EGM (Field type: numeric) CO2_Concentration: Measured CO2 (Field type: numeric) Tree_data (described in worksheet Tree_data) Description: Description of tree information for sampled trees Number of fields: 10 Number of data rows: 10 Fields: Plot: SAFE Project plot code (Field type: location) tree_tag: ID number of tree sampled (Field type: id) Species: Species of tree (Field type: taxa) WoodDensity: Estimated wood density of tree (Field type: numeric) Census_date1: Calendar date of most recent census (Field type: date) D.POM_cm1: Diamater of tree at measurement point at census 1 (Field type: numeric) Height_m: Height of tree (Field type: numeric) H.POM_m: Height at which tree diameter is measured (Field type: numeric) Census_date2: Calendar date of previous census (Field type: date) D.POM_cm2: Diamater of tree at measurement point at census 2 (Field type: numeric) Hourly_data (described in worksheet Hourly_data) Description: Hourly records of temperature and weather observations during the study Number of fields: 4 Number of data rows: 24 Fields: Date: Calendar date (Field type: date) Hour: Hour of which measurments were taken (Field type: time) Temperature (DegC): Air temperature (Field type: numeric) Weather_Observations: weather observations (Field type: comments) Date range: 2018-08-21 to 2020-02-20 Latitudinal extent: 4.7467 to 4.7480 Longitudinal extent: 116.9693 to 116.9706 Taxonomic coverage: All taxon names are validated against the GBIF backbone taxonomy. If a dataset uses a synonym, the accepted usage is shown followed by the dataset usage in brackets. Taxa that cannot be validated, including new species and other unknown taxa, morphospecies, functional groups and taxonomic levels not used in the GBIF backbone are shown in square brackets.  -  Plantae  -  -  Tracheophyta  -  -  -  Magnoliopsida  -  -  -  -  Ericales  -  -  -  -  -  Ebenaceae  -  -  -  -  -  -  Diospyros  -  -  -  -  -  -  -  Diospyros pilosanthera  -  -  -  -  -  Sapotaceae  -  -  -  -  -  -  Payena  -  -  -  -  -  -  -  Payena microphylla  -  -  -  -  Laurales  -  -  -  -  -  Lauraceae  -  -  -  -  -  -  Eusideroxylon  -  -  -  -  -  -  -  Eusideroxylon zwageri  -  -  -  -  Malvales  -  -  -  -  -  Dipterocarpaceae  -  -  -  -  -  -  Dryobalanops  -  -  -  -  -  -  -  Dryobalanops lanceolata  -  -  -  -  -  -  Shorea  -  -  -  -  -  -  -  Shorea faguetiana  -  -  -  -  Magnoliales  -  -  -  -  -  Annonaceae  -  -  -  -  -  -  Maasia  -  -  -  -  -  -  -  Maasia sumatrana  -  -  -  -  Sapindales  -  -  -  -  -  Meliaceae  -  -  -  -  -  -  Aglaia  -  -  -  -  -  -  -  Aglaia odoratissima  -  -  -  -  -  -  -  Aglaia silvestris