Spatial heterogeneity in smallholder oil palm production

Sibhatu, Kibrom T.; Steinhübel, Linda; Siregar, Hermanto; Qaim, Matin; Wollni, Meike

doi:10.1016/j.forpol.2022.102731

Cited by 4 publications

(2 citation statements)

References 48 publications

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“…3.7 and 14.9 Mha, respectively, with almost all of the rubber acreage and nearly half of the oil palm acreage farmed by smallholders (Badan Pusat Statistik, 2020a, 2020b. While on the one hand providing smallholder farmers with stable income (Sibhatu et al, 2022) following large-scale transmigration projects to alleviate poverty and overpopulation in Java since the 1980's (Fasbender & Erbe, 1990;Tsujino et al, 2016), rubber and oil palm cultivation leads to losses of ecosystem functions and biodiversity on the other (Clough et al, 2016;Drescher et al, 2016;Grass et al, 2020). Much of Indonesia's past and current deforestation can be attributed to stepwise conversion of rainforest into agricultural land, including rubber and oil palm plantations.…”

Section: Introductionmentioning

confidence: 99%

Rainforest conversion to cash crops reduces abundance, biomass and species richness of parasitoid wasps in Sumatra, Indonesia

Azhar

Hartke

Böttges

et al. 2022

Agri and Forest Entomology

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1. Parasitoid wasps affect herbivory in natural and agricultural ecosystems, including cash crops. The impacts of rainforest transformation to rubber and oil palm on parasitoid wasp communities are poorly understood.2. We collected canopy arthropods, once each in dry season and rainy season, via canopy fogging in four land-use systems in Jambi, Sumatra, Indonesia: Rainforest, jungle rubber (extensive rubber cultivation) and plantations of rubber and oil palm.3. The combined abundance and richness of six parasitoid wasp families, and Braconidae individually, was twice as high in rainforest as in rubber and oil palm plantations, and intermediary in jungle rubber. There was a significant positive correlation between combined abundance of six parasitoid wasp families, and abundances of potential hosts from the orders Coleoptera, Diptera, Hemiptera and Lepidoptera. Braconid biomass tended to be highest in rainforest and lowest in oil palm plantations, and Braconid communities in oil palm differed from those in the other land uses. Both patterns were influenced by season. 4. Our study details the effects of rainforest conversion to rubber and oil palm on parasitoid wasp communities, and provides first insights on the influence of rainfall seasonality on their abundance, biomass, species richness and community composition in Southeast Asian agricultural landscapes.

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Section: Introductionmentioning

confidence: 99%

Rainforest conversion to cash crops reduces abundance, biomass and species richness of parasitoid wasps in Sumatra, Indonesia

Azhar

Hartke

Böttges

et al. 2022

Agri and Forest Entomology

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“…Generalized Additive Models (GAM) eliminate the assumption of some function to obtain a model that shows the relationship between the response variable ant its predictor variables (Sibhatu et al, 2022). The general form of the GAM model can be formulated as follows:…”

Section: Generalized Additive Models (Gam)mentioning

confidence: 99%

Enhancing Risk Management Strategies: GAM Analysis of Health Insurance Claim Determinants

Wahyu,

Ramdhani

2024

Orics

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Health insurance plays a crucial role in providing financial protection and ensuring access to necessary healthcare services. The awareness of Indonesian society regarding the importance of health insurance continues to grow, as evidenced by a 22% increase in premium income according to AAJI data as of March 2023. Despite the benefits of health insurance, an increasing number of insurance participants raises risks for insurance companies. The Generalized Additive Models (GAM) P-Spline can overcome these problems. The non-linear relationship between claim amount with age, body mass index, and blood pressure can be modelled with GAM P-Spline. The formed GAM model with PIRLS unable to give a clear information of relationship between variables explicitly, but can be seen by the shape of the function of each predictor associated with the link function used.

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Collective action, replanting and resilience; Key lessons from 40 years of smallholder oil palm cultivation in the Ophir plantation, Indonesia

Jelsma,

Turinah,

Gay

et al. 2024

Agricultural Systems

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Spatial heterogeneity in smallholder oil palm production

Cited by 4 publications

References 48 publications

Rainforest conversion to cash crops reduces abundance, biomass and species richness of parasitoid wasps in Sumatra, Indonesia

Rainforest conversion to cash crops reduces abundance, biomass and species richness of parasitoid wasps in Sumatra, Indonesia

Enhancing Risk Management Strategies: GAM Analysis of Health Insurance Claim Determinants

Collective action, replanting and resilience; Key lessons from 40 years of smallholder oil palm cultivation in the Ophir plantation, Indonesia

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