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GLBRC upscale fields … increase in leaf area index from July to September 2009

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GLBRC upscale fields … increase in leaf area index from July to September 2009. B Wilske, KBS GLBRC discuss 8 Oct. 2009. … why we measured plant height? (40 and 10 specimen per plot during 1 st and 2 nd campaign, respectively). B Wilske, KBS GLBRC discuss 8 Oct. 2009.

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Presentation Transcript
slide1
GLBRC upscale fields

… increase in leaf area index from July to September 2009

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide2
… why we measured plant height?

(40 and 10 specimen per plot during 1st and 2nd campaign, respectively)

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide3
… influence of slope on soil moisture?

evidently just a rough tendency

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide4
… influence of slope on growth?

All plots vs slope: seemingly no !

But see later slide

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide5
Plant growth water-limited?

(VWC data from the same week, PPT negligible)

… rather : No …

… look for soil compaction / belowground

development

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide6
Any correlation of top leaf chl. content?

… rather : No …

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide7
… influence of slope on plant growth (LAI, height)?

… weak trends at LuxA but not at Marshall

Height, cm

?

LAI

?

Slope

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide10
Use of (tower-) RH to model stomatal conductance

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide11
Use of (tower-) air temperature to model dark respiration ?

Open symbols 6400-Tleaf … Full symbols 6400_Tair in chamber

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide12
A-Ci - A

B Wilske, KBS GLBRC discuss 8 Oct. 2009

slide14
Preliminary assumptions and prospects (B Wilske, 8 Oct 2009)

if … soil properties were roughly the same at Marshall and LuxA

then … surface runoff under continuous agriculture at LuxA may have

decreased SOM (and thereby increased soil compaction) particularly at slopes

increased soil compaction through fine particle sedimentation in bottoms

both as compared to the Marshall sites, which were managed under CRP

these effects reduce leguminous development and transfer decreased N-availability into the following yrs

thus, aspects of soil conservation and long term productivity may suggest

higher sustainability in bio-energy production through

cellulosic (prairies) than oil or starch crop

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