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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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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 1st and 2nd campaign, respectively)

B Wilske, KBS GLBRC discuss 8 Oct. 2009


… influence of slope on soil moisture?

evidently just a rough tendency

B Wilske, KBS GLBRC discuss 8 Oct. 2009


… influence of slope on growth?

All plots vs slope: seemingly no !

But see later slide

B Wilske, KBS GLBRC discuss 8 Oct. 2009


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


Any correlation of top leaf chl. content?

… rather : No …

B Wilske, KBS GLBRC discuss 8 Oct. 2009


… 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



Use of (tower-) RH to model stomatal conductance

B Wilske, KBS GLBRC discuss 8 Oct. 2009


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


A-Ci - A

B Wilske, KBS GLBRC discuss 8 Oct. 2009


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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