The figure above shows effects of re-wetting a dry soil for 77 days. The arrows

Question

The figure above shows effects of re-wetting a dry soil for 77 days. The arrows indicate influences of each "box" on other "boxes". PLFA evenness is a measure of phospholipid fatty acid analysis, an indicator of the evenness of the bacterial community. An "even" bacterial community has no "bullies". Respiration is a measure of total soil respiration via CO_2 emission. F/B ratio is the ratio of fungi to bacteria in the soil. Richness is a measure of diversity. For this figure, please describe why the different influences were positive or negative (indicated by the positive or negative change after 77 days of wetting). The strength of the association is reflected by the magnitude of the number. You may label each line with a number or letter to make it clear in the essay response. Address how wetting influenced each of these processes by linking the composition of the microbiota, micro-meso-macrofauna you would expect to find changed in wetted vs dry conditions.

Explanation / Answer

Relations among remaining variance in soil-food-web features and C and N fluxes, after variance accounted for by experimental treatments has been removed, 1, 3, 10 and 77 days after rewetting. Remaining variances that nourished into the structural equation model were as follows: microarthropod richness 42.2%, F/B channel ratio 52.2%, PLFA evenness 19.9%, respiration 21.3%, N2O 64.7%, total N leached 10.9%., The weight of the arrows indicates the strength of the causal relationship, complemented by a path coefficient. R2 values signify the quantity of variance enlightened through the model for the response variables. The overall model fit was acceptable (2=64.1, P=0.24; RMSEA=0.033, P=0.754).

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