Photosynthetic rates for leaves from 5 precipitation treatments

Study number: 

40

Data set ID: 

2100409001

Data Access: 

Unrestricted

Dataset status: 

Date range: 

2007-07-25 to 2008-09-20

Original investigator: 

Heather Throop

Data contact: 

Abstract: 

Data are photosynthetic rates (Amax) for leaves collected from plants subjected to five possible precipitation treatments: -80%, -50%, control (0), +50%, +80%.

The objective is to assess photosynthetic response of plants to precipitation manipulations.

Methods: 

instrumental (LiCor 6400)

Photosynthetic rate was measured for mesquite and black grama leaves periodically throughout the growing season. Measurements were made for one leaf for each species from each plot selected for measurements. Measurements were made on a LiCor 6400 with optimal conditions for photosynthesis (PAR = 1500-2000 umol m-2 sec-1, leaf temperature 25-32 C, RH 30-70%). Measurements were made in the morning.

Quality assurance: 

QA/QC: Date Entry by QA/QC Description ---------- ---------------------------- ---------------------------------------------- 09/04/2009 Heather Throop Data checked upon instrument download Preliminary treatment of data: Photosynthetic rates recalculated based on cuvette leaf area

Additional information: 

Block 2 of Sala's Global Change experiment (LTER Study 278) in Pasture 13

Maintenance: 

Approximately 3 times per growing season, contingent upon precipitation

LTER Core Area(s): 

LTER VI Proposal Category: 

Research Network: