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Litter and Aboveground Biomass in an Agroforestry System

Overview: Here we are presenting an excerpt of the outcomes from the Doctored Thesis Project titled “Carbon stock and nutrients cycling in cocoa-based agroforestry systems in Eastern Amazon”. In this research project, we are monitoring cocoa-based agroforestry systems (AFSBM), with different shade-species and different arrangements, in comparison to a native forest (FOR) and a pasture (PAS). The main goal of this survey is to quantify and qualify the potential of these agroforestry system of providing ecosystem services related to carbon storage, soil health and nutrient cycling and their relationship with cocoa yield.

Questions: Is AFSBM closer to FOR than PAS, regarding litter and carbon stock?

Procedures Description: To present some results here in Dokuwiki, we basicly used litter stock (from both rainy and drier season) and biomass and carbon data from the Thesis database to perform the statistical and analysis and to generate the plots presented below. We performed a non-parametric analysis using a Kruskal-Wallis test, followed by a Dunn as a post-hoc test (in case of Kruskal-Wallis test significance) for multiple comparison of FOR, AFSBM and PAS. Additionally, we performed a principal components analysis (PCA). From the components generated, we used the first two components to create the biplot, as a result of the association between the vectorial position of the variables and the scattering of the observations.

Results Interpretation: …

Raw Data and Code used

Plots Generated

Figure 1. Litter stock in rainy season of an Agroforestry System (AFSBM), in comparison to a native forest (FLO) and a pasture (PAS).

Figure 2. Litter stock in drier season of an Agroforestry System (AFSBM), in comparison to a native forest (FLO) and a pasture (PAS).

Figure 3. Aboveground Biomass of an Agroforestry System (AFSBM), in comparison to a native forest (FLO) and a pasture (PAS).

Figure 4. Aboveground carbon stock of an Agroforestry System (AFSBM), in comparison to a native forest (FLO) and a pasture (PAS).

Figure 5. Biplot with the vectorial position of the variables Litter stock in rainy season (LitStockRain) and drier season (LitStockDry), as well as Aboveground Biomass (Biomass) and Carbon (AGC), and the dispersion of the plots for the groups: an Agroforestry System (AFSBM), in comparison to a native forest (FLO) and a pasture (PAS).