FOR 1: Forests and Forestry – Comprehensive Study Notes

Definition of a Forest

• Various definitions from different sources (with authors and year):
  • A forest is a land area of more than 0.5 ha with a tree canopy cover of more than 10%, not primarily under agricultural or other specific non-forest land use (UNEP/CBD, 2001). For young forests or climatically suppressed regions, trees should be capable of reaching a height of 5 m in situ and meet canopy cover in time.
  • A forest is home to a great number and variety of plant, animal, and other organism groups interacting with each other (general definition).
  • A forest is a plant community predominantly of trees and other woody vegetation growing closely together (Sharma, 1992).
  • An ecosystem characterized by more or less dense and extensive tree cover (Ford-Robinson, 1971).
• Translations or equivalents of the word “forest” in various languages appear on the slide (Gubat, bosque, wald, skog, foresta, hutan) with a note-like label LASANG.
• Significance: sets baseline for what qualifies as a forest in discussions of biodiversity, ecosystem services, and policy.

Types of Forests

• Categories listed: Tropical Forests, Temperate Forests, Plantation Forests.
• Global forest types as a framework: Tropical Forests, Tropical Moist Forests, Tropical Dry Forests, Temperate Forests, Coniferous Forests, Broad-leaf and Mixed Forests, and Plantation Forests.

Tropical vs Temperate vs Plantation Forests (basic contrasts)

• TROPICAL FORESTS:
  • Located between the Tropic of Cancer and Tropic of Capricorn.
  • Cover about $7\%$ of the Earth's surface.
  • Two main categories: moist and dry forests.
• TEMPERATE FORESTS:
  • Found in northern and southern hemispheres (e.g., Canada, Northern Europe, Russia, Northeastern Asia).
  • Mixture of deciduous and coniferous evergreen trees.
• PLANTATION FORESTS:
  • Approx. $7\%$ of global forest cover, about $140\times 10^6\ \,ha$.
  • Produce more sustainable timber and fibre than natural forests.
  • Plantations contribute around $40\%$ of industrial wood.

Tropical Rain Forests (overview)

• Tropical rainforests account for about $\frac{2}{3}$ of all tropical moist forests.
• Rainfall is evenly distributed at least $1800\ \text{mm/year}$.
• Global distribution includes: South and Central America, Oceania, Southeast Asia, South Asia, West and Central Africa.

World rainforest distribution map (contextual)

• The slides include a world map visualization showing major oceans and equator lines; rainforest belts lie primarily around the equatorial region and major tropical basins.

Characteristics of Tropical Rainforests

• High biodiversity: about $10{,}000\;\text{species/ha}$.
• Multi-layered structure: emergent layer, upper canopy, understory, forest floor, plus subterranean elements.
• Unique growth forms: epiphytes, lianas, climbers, stranglers.
• Microclimate: humid and warm.

Forest Layers (vertical structure)

• Emergent Layer
• Canopy Layer
• Understory Layer
• Shrub Layer
• Forest Floor
• Subterranean

Philippines context: major rainforest blocks

• The Northern Sierra Madre harbors the largest contiguous tracts of remaining rainforests in the Philippines.

Types of Forest in the Philippines (as listed in the slides)

• Beach Forest
• Mangrove Forest
• Molave Forest
• Dipterocarp Forest
• Mossy Forest
• Pine Forest

Beach Forest

• Occurs on sandy shores above the high-tide line.
• Important sentinel against storm surge and coastal protection via root formations that cover the shore.
• Notable tree examples mentioned: Terminalia catappa; Casuarina equisetifolia.

Mangrove Forest

• Wetland ecosystem dominated by woody plants adapted to brackish to saline tidal waters.
• Trees develop adaptations to tidal changes and salinity (e.g., mangrove pneumatophores).
• Notable species mentioned: Rhizophora mucronata; Sonneratia alba.

Molave Forest

• Found where limestone soil is prevalent; typically coastal.
• Notable species mentioned: Vitex parviflora; Intsia bijuga.
• Molave (Vitex parviflora) used in various applications; contextual illustrations show species examples.

Dipterocarp Forest

• Widely found in moist valley bottoms up to hills and mountain ranges.
• Represents about 75\%$-$80\% of forests in the Philippines.
• Noted for straight bole with few branches up to about $10\ \,m$ height, making it a preferred construction material.
• Example species: Shorea contorta; Dipterocarpus grandiflorus.

Mid-Mountain and Mossy Forest

• Thrives at high elevations, often on mountain peaks.
• Characteristics: low temperature, high humidity from rain or fog, short sunshine duration.
• Epiphytes are a notable feature.

Pine Forest

• Occurs in semi-temperate areas; evergreen trees on steep slopes and high elevations.
• Found in Cordillera Mountain Range, Mindoro, Zambales, and Bukidnon.
• Notable species: Pinus kesiya (Benguet pine); Mindoro Pine (Pinus merkusii).

Philippine Forest Classification (historical vs recent)

• Earlier classification listed 6 forest types: Mossy forest, Beach forest, Dipterocarp forest, Mangrove forest, plus two others not fully listed in the slides.
• Limestone forest noted as a separate consideration.
• Recent classifications classify Philippine forests based on structure, vegetation, physiognomy, and floristic composition; Pine Forest is explicitly recognized.

Functions of a Forest

• Divided into Direct Use Values and Indirect Use Values.
• Direct uses: food, fuel and construction materials, medicinal plants (and traditional swidden agriculture).
• Indirect uses: ecological services, biodiversity preservation, climate regulation, water regulation, soil protection, etc. (summarized under Direct and Indirect Use Values).

Forest as a Source of Food, Timber, and Medicinal Plants

• Traditional communities depend on forests for food, timber, fuel, construction materials, and medicinal plants.

Philippine Forestry Statistics (2024) – Export overview

• Source: DENR Forest Management Bureau, Philippine Forestry Statistics 2024.
• Table/Section: EXPORT SUMMARY OF FOREST-BASED PRODUCTS: 2024 (Value in thousand US$ FOB).
• Some categories and units listed include:
  • SAWN WOOD: Cubic meters; Value data presented in thousands of USD.
  • PAPER AND PAPERBOARD: Gross Kilograms and monetary values.
  • PULP AND WASTE PAPER: Gross Kilograms with values.
  • WOOD CHARCOAL: Kilograms and value.
  • FOREST-BASED FURNITURE: Gross Kilograms and value.
  • OTHER WOOD-BASED MANUFACTURED ARTICLES: Gross Kilograms and value.
  • FIBERBOARD, PLYWOOD, PARTICLEBOARD, Selected Non-Timber Manufactured Articles, WOOD CONTINUOUSLY SHAPED, PREFABRICATED BUILDING OF WOOD, NTFP, DENSIFIED WOOD, WOOD PELLETS AND OTHER, VENEER, WOOD CHIPS AND PARTICLES, WOOD SIMPLY SHAPED.
• Totals given (as per slide):
  • Total Exports of Forest-Based Products: $795{,}984{,}650.92\ ext{gross kilograms}$ and a secondary total of 652{,}471.96\(value unit appears inconsistent in the slide; the gist is that a very large export total is reported).
  • Total Philippine Exports: 73{,}268{,}718.50\(value in USD) (as per the slide).
• Note: The slide presents these figures as a snapshot of 2024 exports from the Philippines’ forest-based products sector.

Forests prevent erosion and improve soils (Ecosystem services)

• Key service: forests prevent erosion, sedimentation, and improve soil quality by maintaining topsoil through litterfall and canopy cover; without cover, topsoil and humus are washed away during precipitation.

Forests as wind protection and storm mitigation

• Green armor concept: forests provide windbreak and reduce storm impact when trees are planted in patterns (e.g., triangular strip planting) to create protective zones.
• Visual treatment shows windbreak height and protected zones and the relationship to wind speed reductions (illustrative values in the slide).
• Coastal mangrove forests act as sentinels against storm surge and tsunamis due to dense vegetation and root networks.

Forests and climate regulation

• Forests contribute to climate amelioration through large-scale evapotranspiration: uptake and gradual release of water stabilizes rainfall distribution.
• Release of moisture can lower air temperatures, offering cooling relief for humans.

Forests absorb pollutants and store carbon

• Forests absorb carbon and other pollutants (e.g., heavy metals) from households/industries; they act as carbon sinks when left intact.
• Carbon storage occurs in trees and soils as dead organic matter; faster tree growth increases sequestration rate.
• Trees also remove dust and pollutants like CO, SO2, and NO2 from the air.

Current condition of forests (global context)

• Annual loss: about $13{,}000{,}000\ ext{ha/year}$ (13 million hectares lost per year).
• Global forest cover estimation (FAO, 2006) using minimum tree height, crown cover, and area size places total area under four billion hectares.
• Long-run view of global forest cover changes (historical timeline):
  • 10,000 years ago: about 71% forest/shrub/wild grassland; 10.6 billion ha total land; deserts/glaciers/rocky terrain made up 29%.
  • 1700: about 52% forest; 6 billion ha; 44% wild grassland/shrubs; 30% crops; 16% grazing.
  • 1900: half of forest loss occurred; 38% forest; 8% cropland; 44% wild grassland/shrubs; 6% grazing.
  • 1950: 44% forest; 4 billion ha; 16% wild grassland/shrubs; 30% crops; 15% crops; 1% urban.
  • 2023: about 38% forest; 4 billion ha; remaining land uses distributed among wild grasslands/shrubs, crops, grazing, urban.
• Takeaway: human activity, especially agricultural expansion, has driven substantial forest loss over millennia.

Causes of Deforestation

• Deforestation results from natural and anthropogenic forces.
• Natural causes: lightning, drought, landslides, pest and disease outbreaks.
• Anthropogenic causes (more frequent and harder to contain):
  • Illegal logging; charcoal production; kaingin-making (slash-and-burn); commercial upland farming with monocropping; poaching of forest products; excessive hunting.

Illegal logging (detail)

• Post-cancellation of logging concessions or permits, residual forest may be locally logged illegally as workers return to the forest.

Charcoal-making (detail)

• Uses young trees and saplings; lack of regular income drives extraction of pole-sized trees for charcoal.

Kaingin-making (detail)

• Clearing through slash-and-burn by migrants seeking cash/food; initial clearings may be small but expand with border crops and short-gestation crops.

Commercial farming in uplands

• Monocropping systems of high-yield varieties, large-scale fertilizer and pesticide use; aims for higher profits, driving forest conversion.

Poaching / excessive hunting

• Hunting of wildlife for bushmeat and sale; other forest products collected (bamboo, rattan, sago, betel nuts, pandans, mushrooms, orchids, medicinal plants).
• Consequence: reduced biodiversity and potential species extinctions.

Real-world example (policy/monitoring snippet)

• A news clipping notes illegal possession of agarwood and enforcement activity by DENR-FOREST MANAGEMENT BUREAU; highlights governance and enforcement in forest product trade.

What to do? (Conservation and management guidance)

• Preserve, conserve, manage, educate, and reforest.
• Preserve virgin forests; conserve secondary forests and plantation forests.
• Educate people and reforest degraded forest lands.

Impacts of Forest Loss

• Poverty and reduced soil and farm productivity.
• Biodiversity loss.
• Reduced reliability/duration of hydroelectric dams due to sedimentation.
• Increased climatic extremes.
• Increased losses of life and property from environmental disasters.

Social responsibility in natural resources management

• Natural resources underpin food production and global life-support systems.
• Regeneration is essential; many people lack social responsibility for resource stewardship.
• Deforestation causes erosion, biodiversity loss, and contributes to global warming; over-reliance on chemical inputs can pollute water and food chains.
• Key actions include soil conservation (e.g., cover crops), composting, and community engagement in conserving mangroves and forestlands.

Links between uplands and lowlands

• Population movement between uplands and lowlands.
• Upper watersheds regulate downstream water flow; erosion causes siltation and flooding downstream.
• Lowlands provide markets for upland products; government policies are often determined in lowlands, affecting upland communities.

Inspirational quote

• "In the end, we will conserve only what we love, we will love only what we understand, and we will understand only what we are taught" — E. O. Wilson (page 70)

References (selected, as listed in slides)

• FOR 1 materials and several forestry texts and reports (DFPBS/DSFFG, Brown & Pearce 1994, Calderon 1999, CIFOR/FAO 2005, Concio 2011, Daniel et al. 1979, DENR 2024, FAO 2006, FAO/IIRR 1995, Fernando et al. 2008, Whitford 1911, Our World in Data 2025).
• Note: A number of cited works provide foundational forestry theory, Philippine forest formations, and global deforestation context.

Endnotes

• All numerical values are presented in inline LaTeX-friendly format as math blocks where appropriate, e.g., $0.5\ \text{ha}$, $10\%$, $1800\ \text{mm/year}$, $\frac{2}{3}$, $140{,}000{,}000\ \text{ha}$, $13{,}000{,}000\ \text{ha/year}$, $75\%\text{--}80\%$, etc.
• The notes reflect the order and emphasis found across the slides, aiming to be a comprehensive, exam-ready synthesis of the material presented.