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Title:
CSPs: LAI and PAR Gutianshan 2009
Access rights:
Private
Usage rights:
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Published:
No information available
Abstract:
Measuring light interception is important for understanding the conditions at the surface. Questions which had to be answered: How much of the light is reaching the ground and how much is hitting leaf material in the canopy? How efficient were the trees in filtering the light? This is important for having optimal photosynthetic performance.
Design:
Digital hemispherical photographs (Canon EOS 350 fitted with Sigma 8 mm fisheye objective) were taken at the central points of each subplot (n=9), horizontally leveled at 1.3 m height above ground in summer 2009. Auto Exposure Bracketing (AEB) at +/- 2 stops. The photos were analyzed with the software Hemisfer from P. Schleppi et al (2005). LAI was calculated on plot level including 9 pictures. Correction is applied for slope, non-linearity and clumping. Measurement of Photosynthetically Active Radiation (PAR) above and below canopy. PAR is between 400 and 700 nm wavelength. Term used: LI = (PAR above canopy - PAR below canopy) / (PAR above canopy). LI was calculated on plot level including 9 pairs of measurements. PAR is measured as photon flux density (μ mol m-2 s-1).
Spatial extent:
Comparative study sites of the BEF-China Experiment.
Temporal extent:
No information available
Taxonomic extent:
No information available
Measurement cirumstances:
No information available
Data analysis:
As plants are thought to compete for light, LAI gives a measure on how well the plot can exploit the resource light.

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Dataset column

Name:
CSP
Definition:
name of the CSP in the Nature ReserveBEF research plot nameReasearch plots of the Biodiversity - Ecosystem functioning experiment (BEF-China). There are three main sites for research plots in the BEF Experiment: Comparative Study Plots (CSP) in the Gutianshan Nature Reserve, having a size of 30x30m^2, measured on the ground.
Unit:
No information available
Datagroup:
BEF research plot name
Keywords:
CSP
Values:
CSP05
CSP01
CSP04
CSP03
CSP02
Contributors:
No information available

Dataset column

Name:
LAI
Definition:
leaf area index (LAI)
Unit:
dimensionless (m2 / m2)
Datagroup:
Leaf Area Index (LAI)
Keywords:
LAI, light
Values:
1.48
1.72
1.64
1.69
1.95
Contributors:
No information available

Dataset column

Name:
LI
Definition:
light interception (LI)
Unit:
μ mol m-2 s-1
Datagroup:
Photosynthetically active radiation (PAR)
Keywords:
light
Values:
0.755406143
0.726016542
0.653601658
0.679125793
0.779712715
Contributors:
No information available

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15 schmid medium

Bernhard
Schmid

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69 kundela medium

Andreas
Kundela

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