Aboveground net primary productivity measurement (Pinaceae)

Knowledge graph centered on Aboveground net primary productivity measurement (Pinaceae) with 38 nodes and 123 connections. Top connected: Spruce, elevational gradients, climate change effects on species interactions, Picea engelmannii, Subalpine forest carbon cycling: Short- and long-t.

Method synopsis

Calculation of tree biomass increment through repeat diameter measurements combined with allometric equations, plus litterfall collection to estimate total aboveground productivity.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Subalpine forest carbon cycling: Short- and long-term influence of climate and species (2005), Ecological Applications. Implementations in other papers (listed below) may differ.

1. Calculate tree biomass increment
   Remeasured dbh on all trees measured in 1999 as well as on saplings that had grown to 1.4 m since 1999 in June 2002. Calculated 2002 tree biomass using 2002 dbh and tree height equations used in 1999. Estimated mortality as total biomass of trees that were live in 1999 but dead in 2002 and divided biomass increment and mortality by time between measurement periods (2.8 yr) to yield annual rates.
   Quantities: All trees remeasured, 20 of 1378 trees across all plots, 2.8 year measurement intervalDuration: June 2002 remeasurementConditions: During growing season
   Equipment: steel diameter tape
2. Collect and process litterfall
   Collected litterfall monthly during growing seasons between August 1999 and July 2001, from mesh-lined (0.14-m² litter traps placed in each subplot. June collections included litter from previous October-May. Separated litter by species (pine, spruce, and fir), and/or component. Dried material at 65°C, weighed it, and calculated plot mean annual totals for two years August 1999-July 2000 and August 2000-July 2001.
   Quantities: 0.14 m² litter traps, 1 trap per subplot, 5 subplots per plot, monthly collections, 2 years of dataDuration: August 1999 to July 2001, monthly collectionsConditions: Growing seasons, dried at 65°C
   Equipment: 0.14-m² mesh-lined litter traps, oven, balance

Typical Equipment

• steel diameter tape
• mesh-lined litter traps
• oven
• balance

Output Measurements

• tree biomass increment
• litterfall mass
• aboveground net primary productivity

Papers Using This Protocol (1)

Species Studied With This Protocol