1. Describe the physical characteristics of tropical rainforests (climate, soils, vegetation)
2. Explain the causes of deforestation and their relative importance
3. Evaluate the economic, social and environmental impacts of deforestation
4. Assess sustainable management strategies for rainforests
5. Apply knowledge to the Malaysian Borneo rainforest case study
50%
Forest lost (1973-2015)
55,000
Orangutans remaining
73,000
Hectares lost/year (2020)
15,000+
Plant species
Why Malaysian Borneo? Part of Sundaland biodiversity hotspot. Home to critically endangered Bornean orangutan, pygmy elephant, Sumatran rhinoceros, proboscis monkey. Heart of Borneo Initiative: 220,000 km² conservation priority area.
Physical Characteristics
Temperature
26-28°C
Year-round average
Diurnal range 6-8°C (day-night)
Precipitation
2,000-4,000mm
Per year (no dry season)
Convectional rainfall, afternoon thunderstorms
Humidity
80-90%
Relative humidity
Hot and humid constantly
Plant Adaptations
Soil Characteristics
- Deep red/orange colour: Iron oxide (rust)
- Can be 30m+ deep: But only top 5cm nutrient-rich
- Surprisingly INFERTILE: Most nutrients in biomass, not soil
- Rapid leaching: Heavy rain washes nutrients away
Why infertile?
- Heavy rain leaches (washes away) nutrients deep into soil
- High temperatures cause rapid decomposition
- Nutrients absorbed by plants immediately - rapid cycling
- Once forest cleared, soil loses fertility in 2-3 years
15,000+
Plant species
420+
Bird species
221
Mammal species
80,000+
Insect species (est.)
Endemic Species (found nowhere else)
Why so biodiverse?
Causes of Deforestation in Malaysia
50%
Bornean forest lost (1973-2015)
(42 years of destruction)
17%
Malaysia's rainforest lost (2001-2021)
(3.2 million hectares)
73,000
Hectares lost per year (2020)
(2x size of Glasgow)
Causes Explorer - Click to expand
Key Exam Point: Palm Oil is PRIMARY Cause
60-86% of Malaysian deforestation is caused by palm oil plantations. Malaysia is the world's 2nd largest producer. Remember: Palm oil = highest-yielding oil crop (5x more than soybean per hectare), used in 50% of supermarket products.
Palm oil revenue $25 billion/year export earnings
600,000+ jobs in palm oil industry
Loss of potential medicines (2,000+ plant species with medicinal properties)
Ecotourism decline ($3+ billion/year threatened)
148,500 Bornean orangutans lost 1999-2015 (critically endangered)
3.55 Gt CO2 released 2001-2019 (equivalent to 750 million cars)
Soil erosion: 50-100 tonnes/hectare/year (vs 1 tonne in intact forest)
10,000+ indigenous people displaced by dams and plantations
Haze from fires: 70 million people affected (1997-98), 500,000 respiratory cases
Loss of traditional knowledge (ethnobotany, cultural practices)
Positive (Short-term)
- $25 billion/year palm oil export revenue
- 600,000+ jobs in oil palm industry
- 5% of Malaysia's GDP from palm oil
- Tax revenue funds public services
Negative (Long-term)
- Loss of potential medicines (2,000+ species)
- Ecotourism decline ($3+ billion/year at risk)
- Forest products lost ($500M/year to locals)
- Flood damage costs $100M+/year
Sustainable Management Strategies
What's Working
- 1.Deforestation rate declining: 185,200 ha/year (2016) to 73,000 ha/year (2020) = 60% reduction
- 2.Protected areas expanded: 15 national parks (2.5M hectares = 10% of Malaysian Borneo)
- 3.RSPO certification: 60%+ of Malaysian palm oil certified (world's highest)
- 4.Ecotourism growing: $3B/year, 50,000+ jobs, communities choosing conservation
What's NOT Working
- 1.Still losing forest: 73,000 ha/year > 30,000 ha/year replanting = NET LOSS
- 2.Enforcement weak: Illegal logging continues, fines too low ($1,000 vs $100,000 profit)
- 3.Orangutans still declining: 55,000 remaining (need 100,000+ for viability)
- 4.Indigenous rights ignored: Land taken for plantations, forced relocations continue
1. What percentage of Malaysia's deforestation (1995-2000) was caused by palm oil plantations?
2. How many Bornean orangutans were lost between 1999-2015?
3. What is the Selective Management System rotation cycle in Malaysia?
4. How much area did the Bakun Dam reservoir flood?
5. What percentage of Malaysian palm oil is RSPO-certified?
6. How much forest does Malaysia still lose per year (2020)?
Key statistics to remember: 50% forest lost, 55,000 orangutans, 73,000 ha/year lost, 60%+ RSPO certified, $3B ecotourism
Primary cause: Palm oil (60-86%) - highest-yielding oil crop, $25B/year, 600,000 jobs
Named management strategies: Selective Management System (1977), RSPO certification, REDD+ carbon credits, Kinabalu/Mulu National Parks
Evaluation: Deforestation rate declining (60% reduction 2016-2020) BUT still net loss (73,000 ha lost vs 30,000 ha replanted)