A section of Bali’s mangrove ecosystem in Benoa has suffered a mass die-off, with hundreds of trees found dead and drying out in recent weeks. The incident has triggered growing public concern, calls for remediation, and even a police complaint from environmental community groups.
What happened
Local reporting places the affected area around the west side of the Bali Mandara toll road entrance / Pelabuhan Benoa corridor, where mangrove stands were found dying in blocks rather than gradually — a pattern researchers say is consistent with exposure to an external stressor rather than a slow natural decline.
What researchers found
A research team linked to Universitas Udayana reported that laboratory testing of samples taken from the mangrove rhizosphere (root zone) showed petroleum contamination, with results pointing specifically to diesel (solar) exposure.
According to Balipost, the team used GC–MS (Gas Chromatography–Mass Spectrometry) analysis and detected hydrocarbon profiles consistent with diesel fuel.
Antara also reported the researchers’ explanation that petroleum contaminants can remain in sediment, clogging soil pores and roots, and that aromatic compounds in fuel can damage plant cells and disrupt nutrient absorption — potentially killing mangroves within weeks after exposure.
Government clarification on location
Bali’s Forestry and Environment agency (DKLH) has stated that the mangroves reported dead in Benoa are not within the Tahura Ngurah Rai protected forest area, while also noting that field checks did not show signs of disease like fungal or viral attack — strengthening the likelihood that the cause is environmental/chemical.
Community groups file police complaint
As the issue escalated, multiple environmental groups reportedly submitted a complaint to Polda Bali alleging a potential environmental crime linked to the incident. Balipost reported that a complaint was filed naming PT Pertamina Patra Niaga and referencing alleged violations under Indonesia’s environmental law (UU No. 32/2009), including provisions that carry serious criminal penalties if pollution causes environmental quality standards to be exceeded.
Detik Bali also reported the police report, describing it as tied to alleged pollution contributing to the mangrove deaths.
Why this matters
Mangroves aren’t “just trees.” They are one of Bali’s most important coastal defense systems — supporting fisheries, protecting shorelines from erosion, filtering water, and storing carbon.
A mass die-off is more than a local environmental story. It’s a warning signal about:
- coastal ecosystem health
- industrial risk management
- water and sediment pollution control
- and how quickly environmental damage can spread when contamination reaches wetlands
What happens next
At this stage, the key questions are:
- Where did the contamination come from?
- How far has it spread through the sediment?
- What recovery action is needed — and is replanting alone enough?
Environmental reporting has raised the point that remediation may require more than reforestation if the soil/sediment is contaminated — including potential bioremediation efforts.
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