Point-frame measurments from a nitrogen (N), phosphorus (P) and N+P fertilization experiment at the 2007 Anaktuvuk River, Alaska, USA fire scar during the 2016-2019 growing seasons

Abstract: 

This file contains point-frame measurements from a nitrogen (N), phosphorus (P) and N+P fertilization experiment established in the southern section of the 2007 Anaktuvuk River fire in 2016 at a severely burned site and an unburned site. Pin-vegetation contact was recorded using a 0.75 m2 frame with 41 evenly spaced pin-drop points. Data was collected once during the height of the  growing season in 2016 (when fertilization began) 2017, 2018 and 2019.  This data was used to measure the impact of fertilization and fire on community composition.

Project Keywords: 

Data set ID: 

20106

EML revision ID: 

2
Published on EDI/LTER Data Portal

Citation: 

Rocha, A. V. 2020. Point-frame measurments from a nitrogen (N), phosphorus (P) and N+P fertilization experiment at the 2007 Anaktuvuk River, Alaska, USA fire scar during the 2016-2019 growing seasons Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/c28d78e8a3c11b52b38cf1f1c01dc671
People

Owner/Creator: 

Contact: 

Additional People: 

Associated Researcher
Dates

Date Range: 

Sunday, July 31, 2016 to Friday, July 26, 2019

Publication Date: 

2020

Methods: 

Sites are located within the southern section of the Anaktuvuk River Fire (ARF) scar approximately 37 km NW of Toolik Field Station at a severely burned (68.99°N, 150.28°W) and unburned (68.93°N, 150.21°W) location established previously by Rocha and Shaver in 2008 (Rocha and Shaver 2011a, b). At both sites, a randomized block, factorial N and P fertilization experiment was established in 2016 (9 years post-fire). The experimental design consisted of 5 blocks each consisting of a control (CT), nitrogen (N), phosphorus (P), and nitrogen plus phosphorus (N+P) treatment.  CT plots recieved no treatment, N plots received 5 g/m2 of NH4 as NH4Cl and 5 g/m2 of NO3 as NaNO3, P plots received 5 g/m2 of P as P2O5 and N+P plots received both of the N and P fertilizer treatment. Fertilizer amounts mimiced treatment amounts at the Arctic LTER sites at Toolik Lake. Each plot was 20 m2.


Point-frame measurments were recorded at peak of each growing season from 2016-2019. In short, hits were recorded using a point-intercept method. A 0.75 m2 frame containing 41 evenly spaced pin sampling points was placed 0.5 meters in from the middle of the southern edge of each plot and at a height above the canopy. A 4 mm-diameter, metal pin was dropped vertically through the canopy at each of the 41 sampling points and every vegetation-pin contact was recorded according to species and summed for each plot. 


Detailed site descriptions are published in

Rocha, A.V. and G.R. Shaver, 2011, Ecological Applications, v21, pg 477 and Rocha, A.V. and G.R. Shaver, 2011, Global Change Biology, v17, pg 2831.

Version Changes: 

Version 1, August 2020: Initial release

Version 2, August 2020: Define acronyms

Sites sampled.

Full Metadata and data files (either comma delimited (csv) or Excel) - Environmental Data Initiative repository.

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy