CRUI Land Use Project - Microclimate

Data

• hf138-01: microclimate

Overview

• Lead: Timothy Sipe, Richard Bowden, Charles McClaugherty
• Investigators: Rachel Clark, Melissa Kibler
• Contact: Timothy Sipe
• Start date: 1997-04-01
• End date: 1997-10-31
• Location: Prospect Hill Tract (Harvard Forest)
• Latitude: +42.53 to +42.55
• Longitude: -72.20 to -72.17
• Elevation: 335 to 357 meters
• Taxa:
• Research topic: historical, plot, community
• Study type: short-term measurement
• LTER core area: disturbance
• Keywords: air temperature, microclimate, photosynthetic photon flux, relative humidity, soil temperature
• Release date: 2009
• EML version: knb-lter-hfr.138.3
• Revisions:
• Related links:
• CRUI Land Use Project - Litterfall, Biomass and Productivity
• CRUI Land Use Project - Tree Canopy Leaf Area Index
• CRUI Land Use Project - Canopy Sky Factors
• CRUI Land Use Project - Herbaceous Species
• CRUI Land Use Project - Mapped Trees
• CRUI Land Use Project - Photosynthetic Light Response Curves
• CRUI Land Use Project - Herbaceous Stratum Sunfleck Regimes
• CRUI Land Use Project - Tree Seedlings
• CRUI Land Use Project - Herbaceous Community Composition
• CRUI Land Use Project - Soil Properties
• CRUI Land Use Project - Soil Respiration
• Abstract:

  Understory microenvironmental patterns are strongly influenced by both the forest community and substrate, which are in turn affected by site factors, disturbance history and recovery processes. We measured ground-level microclimates across the growing season as part of a multi-faceted study of soil-plant-atmosphere interactions in sites with different agricultural land-use legacies (formerly plowed, formerly pastured, permanent woodlots) in Prospect Hill.

  A permanent 30 x 50 m plot was established in each of six sites (2 per land use category) and gridded into 5 x 5 m sub-plots. Fifteen microclimate stations were used to measure photosynthetic photon flux (PPF, umol m-2 s-1, LI-190 quantum sensor, Li-Cor, Inc), soil temperature (107B thermistor, Campbell Scientific, Logan, Utah), and air temperature (107 thermistor, Campbell Scientific, Logan, Utah) at 5 locations each in three sites simultaneously. PPF and air temperature were measured at 50 cm, while soil temperature was measured 5 cm. The central sample station was located in the center (sub-plot D6) of the 30 x 50 m grid and four additional stations were positioned 10 m from the central station in the cardinal directions. In addition to the variables described above, relative humidity (%, 207 air temperature/relative humidity probe, Campbell Scientific, Logan, Utah) was measured at 50 cm at the central station.

  All sensors were connected to a Campbell Scientific 23X datalogger and sampled continuously every 10 sec and averaged every 10 minutes for 5 days at a time. The stations were switched between two sets of sites (P1-S2-W2 followed by P2-S1-W1) at the end of every week, so the data record for any one site includes alternate weeks. Measurements were made during April through September, 1997. The data archived here are daily means per variable per station. Missing records are due to inclement weather, while blank fields represent occasional sensor or datalogger connection problems.

• Methods:

  Plot locations: Plow #1 Site: Prospect Hill Tract, Compartment # III, southern end. Plow #2 Site: Prospect Hill Tract, Compartment # III, southern end. Pasture #1 Site: Prospect Hill Tract, Compartment # I, southeastern edge. Pasture #2 Site: Prospect Hill Tract, Compartment # VIII, central edge. Woodlot #1 Site: Prospect Hill Tract, Compartment # VIII, northeastern edge. Woodlot #2 Site: Prospect Hill Tract, Compartment # VII, central.

• Use:

  This dataset is released to the public and may be freely downloaded. Please keep the designated Contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement. For more information on LTER Network data access and use policies, please see: http://www.lternet.edu/data/netpolicy.html.

• Citation:

  Sipe T, Bowden R, McClaugherty C. 2009. CRUI Land Use Project - Microclimate. Harvard Forest Data Archive: HF138.

Detailed Metadata

hf138-01: microclimate

1. Site: site
   • P1: Plow 1
   • P2: Plow 2
   • S1: Pasture 1
   • S2: Pasture 2
   • W1: Woodlot 1
   • W2: Woodlot 2
2. Date: calendar date (YYYY-MM-DD)
3. Julian: Julian date (DDD)
4. PPF-D4: photosynthetic photon flux measured 50 cm above ground at permanent plot grid location D4 (micromolesPerMeterSquaredPerSecond )
5. PPF-F6: photosynthetic photon flux measured 50 cm above ground at permanent plot grid location F6 (micromolesPerMeterSquaredPerSecond )
6. PPF-D8: photosynthetic photon flux measured 50 cm above ground at permanent plot grid location D8 (micromolesPerMeterSquaredPerSecond )
7. PPF-B6: photosynthetic photon flux measured 50 cm above ground at permanent plot grid location B6 (micromolesPerMeterSquaredPerSecond )
8. PPF-D6: photosynthetic photon flux measured 50 cm above ground at permanent plot grid location D6 (micromolesPerMeterSquaredPerSecond )
9. TSOIL-D4: soil temperature (5 cm) at grid location D4 (celsius )
10. TSOIL-F6: soil temperature (5 cm) at grid location F6 (celsius )
11. TSOIL-D8: soil temperature (5 cm) at grid location D8 (celsius )
12. TSOIL-B6: soil temperature (5 cm) at grid location B6 (celsius )
13. TSOIL-D6: soil temperature (5 cm) at grid location D6 (celsius )
14. TAIR-D4: air temperature (50 cm) at grid location D4 (celsius )
15. TAIR-F6: air temperature (50 cm) at grid location F6 (celsius )
16. TAIR-D8: air temperature (50 cm) at grid location D8 (celsius )
17. TAIR-B6: air temperature (50 cm) at grid location B6 (celsius )
18. TAIR-D6: air temperature (50 cm) at grid location D6 (celsius )
19. RELHUM: relative humidity (%, 50 cm) measured at the central microclimate sampling location (D6) (dimensionless )