PREMIS-ghg

Soil GHG experiment

Motivation

Disturbances such as sea level rise, increased extreme weather events, and climate change can have lasting impacts on terrestrial ecosystems. Monitoring greenhouse gas fluxes at the terrestrial-aquatic interface offers a way to quantify the stability and resilience of terrestrial soils in a stressed environment.

Design

We are testing soil response to salt water intrusion by monitoring soil respiration rates along a creek transect at the Smithsonian Environmental Research Center (SERC). We have transplanted soil cores (40 cm diameter, 20 cm depth) along a salinity and elevation gradient at three locations (~1 km between salinity plots, ~50 m between elevation plots). This design will also be replicated on the west coast at Beaver Creek. We hypothesize that an increase in salinity will suppress soil CO2 respiration, but not affect methane production.

More info here!

Real-time data diagnostics

Last run: Wed Dec 11 09:27:14 2019

IRGA data

CO2 flux over time

#> 
#> Attaching package: 'lubridate'
#> The following object is masked from 'package:base':
#> 
#>     date

Soil temperature versus CO2 flux for all cores

Licor soil moisture over time

Coefficient of variation between collars

Weather station data

Soil temperature at 20 cm and 2 cm depth

Air temperature and Relative Humidity

Soil moisure at 20CM and 2CM depth

Stdev for each temperature and moisture probe

#> # A tibble: 201,733 x 7
#> # Groups:   Site, Sensor_Depth, Sensor_Group [18]
#>   Site  Sensor_Depth Sensor_Group Timestamp               n meanValue
#>   <chr> <chr>        <chr>        <dttm>              <int>     <dbl>
#> 1 HSLE  20CM         Temp         2018-06-12 13:53:03     1      17.3
#> 2 HSLE  20CM         Temp         2018-06-12 14:08:03     1      17.3
#> 3 HSLE  20CM         Temp         2018-06-12 14:23:03     1      17.3
#> 4 HSLE  20CM         Temp         2018-06-12 14:38:03     1      17.4
#> 5 HSLE  20CM         Temp         2018-06-12 14:53:03     1      17.4
#> # … with 2.017e+05 more rows, and 1 more variable: sdValue <dbl>

Wells

Well conductivity data

Other

Histogram of trees by DBH

Litter data

#> Warning: Removed 12 rows containing missing values (position_stack).