The intensive management of cropland refers to a reduction in habitat complexity (i.e., shade tree cover, tree species richness, crop species richness) to gain more profits. This usually entails a decrease in biodiversity, but agroforestry systems have been shown to provide a solution to the need for profits while maintaining biodiversity and ecosystem services. Invertebrates are important bioindicators since they are not just affected by a decrease in habitat complexity; they are also key for the maintenance of ecosystems given their ecological roles. We aimed to understand how agricultural intensification impacted invertebrate abundance and richness in an agroforestry system in Bali, Indonesia. We set up 53 × 25 m² plots and collected data via pitfall and pan traps. We linked those data to vegetation data (canopy cover, tree species richness, crop species richness), habitat type (rustic vs. polyculture), and productivity. Overall, we found that the abundance and richness of invertebrate taxa were positively influenced by increasing canopy cover and crop and tree species richness. This supports the habitat heterogeneity hypothesis, which indicates that increased habitat complexity promotes higher invertebrate species richness and abundance. The abundance and richness of certain invertebrate taxa, including agents of biocontrol, were shown to increase in plots with higher yields, thus solidifying the important role of invertebrate communities in the provision of ecosystem services. Harvesting crops from complex agroforestry systems ensures a sustainable income for local communities as well as habitats for invertebrates.

Agroforestry has been widely suggested as a tool for storing carbon while also providing other ecosystem services like food and income production. A greater understanding of how carbon storage in agroforestry systems varies, and particularly how it is intertwined with the productivity of these systems, could enable farmers and policymakers to make changes that simultaneously increase carbon storage and alleviate poverty. In this study, we used allometric equations to evaluate the carbon storage in the biomass of two complex agroforestry systems in Bali, Indonesia—rustic where a native tree canopy is still present, and polyculture where all native trees have been removed, and the canopy consists only of cropping trees. We then compared these figures to that of a nearby primary forest and linked carbon storage to productivity for both agroforestry systems. We found that the primary forest (277.96 ± 149.05 Mg C ha⁻¹) stored significantly more carbon than either the rustic (144.72 ± 188.14 Mg C ha⁻¹) or polyculture (105.12 ± 48.65 Mg C ha⁻¹) agroforestry systems, which were not significantly different from each other. We found productivity and carbon storage to be significantly positively correlated with each other within the polyculture system but not within the rustic system. We also found that for the rustic system, an increase in the density of native trees is accompanied by an increase in carbon storage, but no significant change in productivity. Consequently, we conclude that within the rustic system, carbon storage can be increased or maintained at a high value by the preservation and encouragement of large native trees, and that this need not necessarily result in a decrease in productivity.

Indigenous farming practices (e.g., traditional agroforestry) can sustain high levels of biodiversity and ecosystem services (e.g., natural pest and pathogen control) and can be sustainable in the long term, especially if integrated with innovation and technology. We investigate the factors influencing pests and pathogen impact on agroforestry practices in Indigenous communities in Bali, Indonesia. We collected data via 100 plots with different compositions of crops in both community forests (where the use of agrochemicals is precluded by social rules) and polyculture (with no limitation on the use of agrochemicals). For each plot, we obtained a score of infestation for four cash crops (banana, coffee, cacao, and vanilla) by calculating the proportion of plants affected and giving a percentage score of infestation. Analysis was performed via generalised additive models with crop richness, canopy cover, and agroforestry type as factors. The crop with highest damage was cocoa (63.9% plants affected by black pod disease) and we also recorded a widespread incidence of the vascular streak dieback (19.4% plants affected). Fusarium stem rot was the second highest damage in crops, with 30.0% of vanilla plants infected. Fusarium wilt affected 10.2% of banana plants and the coffee berry borer affected 9.7% of coffee plants. There were no differences in pest and pathogen incidence between community forest and polyculture, thus insecticides and fungicides had little to no impact on crop infestations. An increased crop richness favoured a reduction in some insect pests, suggesting a potential increase in natural pest control. Since insecticides and fungicides do not seem to have a significant impact in reducing pest and pathogen infestation (probably due to genetic variability and resistance of pests and pathogens), the most effective Indigenous practice is to diversify profits from different crops, thus buffering the negative effects of market fluctuations and yield loss.