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Belowground C Allocation Estimated as
Soil Respiration Minus Aboveground
Litter Inputs
Sarah Abbott with Tim Fahey, Ruth Yanai,
Alex Young, and Shiyi Li
(Raich & Nadelhoffer, 1989)
Introduction: Belowground Carbon Allocation
Litter
Respiration
Belowground
Carbon
Allocation
Belowground
Carbon
Allocation
Respiration - Litterfall =
Assumption: Steady State
Methods
Li-Cor: Measures Soil Flux Litter Baskets
7 respiration collars per plot
13 stands
5 litter baskets per plot
13 stands
Nitrogen Depresses Soil Respiration
Average Soil Respiration (‘15, ’16, ‘17, ‘18) .
Average Litterfall (‘15, ’16, ‘17).
Phosphorus Depresses Leaf Litter Production
Calculating belowground C allocation requires
putting both of these in the same units and
estimating year-round soil respiration--stay tuned!
RESULTS
N decreases soil respiration
(and likely belowground C allocation)
P decreases leaf production
(does this relate to greater diameter growth?)
Can we conclude that P matters more aboveground
and N matters more belowground?

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Belowground c allocation estimated as soil respiration minus aboveground litter inputs sarah abbott

  • 1. Belowground C Allocation Estimated as Soil Respiration Minus Aboveground Litter Inputs Sarah Abbott with Tim Fahey, Ruth Yanai, Alex Young, and Shiyi Li
  • 2. (Raich & Nadelhoffer, 1989) Introduction: Belowground Carbon Allocation Litter Respiration Belowground Carbon Allocation Belowground Carbon Allocation Respiration - Litterfall = Assumption: Steady State
  • 3. Methods Li-Cor: Measures Soil Flux Litter Baskets 7 respiration collars per plot 13 stands 5 litter baskets per plot 13 stands
  • 4. Nitrogen Depresses Soil Respiration Average Soil Respiration (‘15, ’16, ‘17, ‘18) .
  • 5. Average Litterfall (‘15, ’16, ‘17). Phosphorus Depresses Leaf Litter Production
  • 6. Calculating belowground C allocation requires putting both of these in the same units and estimating year-round soil respiration--stay tuned! RESULTS N decreases soil respiration (and likely belowground C allocation) P decreases leaf production (does this relate to greater diameter growth?) Can we conclude that P matters more aboveground and N matters more belowground?

Editor's Notes

  1. What goes down must come up. Litterfall must get respired, in the long run,
  2. ** No Detectable Difference Hypothesis: H0: μC = μN = μNP =μP H1: at least one of means is different F: 1.73 Fcrit: 2.81 Reject hypothesis P value: 0.17
  3. ** No Detectable Difference Hypothesis: H0: μC = μN = μNP =μP H1: at least one of means is different F: 1.96 Fcrit: 2.81 Reject hypothesis P value: 0.13 Here we perform Analysis of Variance (ANOVA) to test whether the means of the treatment types are equal. The one-way analysis of variance is used to determine whether there are any statistically significant differences between the means of three or more independent groups. It’s odd that the technique is called "Analysis of Variance" rather than "Analysis of Means." but appropriate because inferences about means are made by analyzing variance. The X is the mean Bar is median Box is interquartile range (middle 50%) Whiskers are extrema ANOVA and Box whisker plots suggest that N and N+P may