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Large-scale tree planting can reduce streamflow and groundwater availability, especially in dry or water-stressed places, and can harm native ecosystems when it replaces natural grasslands, wetlands, or other non-forest habitats. The risks depend on the site’s water balance, the vegetation being replaced, tree species and density, and long-term management. Restoring forest on suitable, formerly forested land can also protect soil and improve water quality. The key question is not how many trees a project adds, but whether trees belong in that landscape and how the project affects water, wildlife, and people.
How tree planting can affect water supplies
Trees take up water through their roots and return much of it to the atmosphere through transpiration. A planted forest can also intercept rainfall. In a place with limited precipitation, that water use may leave less for groundwater recharge, streams, wetlands, farms, or communities downstream. The effects can extend beyond the planted area.
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That does not mean every forest reduces usable water. The outcome depends on local rainfall, soils, groundwater and stream conditions, existing demand, species, stand density, and management. The Food and Agriculture Organization (FAO) warns that “the effect of planted forests on water cannot be generalized”; proposals need to be assessed against local ecology, water availability, and the water services people need. FAO planted-forest guidelines discuss both water risks and the need for site-specific assessment.
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Why dry and water-stressed catchments need particular scrutiny
Where water is already scarce, additional tree water use can intensify seasonal shortages or reduce recharge and flows relied on by other users. The risk is especially important when a proposal uses species with high water requirements or plants them at a density that exceeds local water availability. Assess both surface water and groundwater, and account for how water use may change as trees mature.
One FAO example illustrates why context matters: more than 3,000 hectares of rainfed Aleppo pine were planted in the Yatir area in the early 1960s, where average annual precipitation is 270 millimetres. FAO reports that the forest used all precipitation water. These figures describe that specific dryland case; they are not a forecast for other forests or climates. FAO’s account does not establish a publication year for this example. FAO’s discussion of forests and water presents the case as part of its treatment of water balance.
The example is a reason to examine a proposed planting’s full water balance, not a universal measure of how much water trees use. Rainfall, soils, local recharge, water distribution, species, and management differ from place to place. A proposal in a wet catchment cannot be judged by transferring the Yatir figures, and a planting in a water-stressed catchment should not be assumed harmless simply because it uses rain rather than irrigation.
When planting may help water-related services
Well-sited planted forests, as part of watershed management, may improve water quality, reduce erosion and sedimentation, stabilize soil, and help regulate flows. These benefits are conditional: they do not establish that every planting reduces floods, increases streamflow, or supplies more water for use. The relevant goal might be cleaner water or less erosion rather than a larger volume of water downstream. FAO summarizes potential watershed benefits in its guidance on managing planted forests; the IPCC’s 2022 assessment of agriculture, forestry, and other land uses also describes benefits from well-planned restoration while warning that poorly planned afforestation can reduce water yield.
A contrasting example comes from Chile. The IPCC reports that replacing a non-native Eucalyptus plantation with native forest was associated with a 28–87% increase in base flow during restoration compared with pre-treatment. That range is from one restoration study cited in the IPCC’s 2022 assessment, not an expected result for native planting elsewhere. IPCC Working Group II, Chapter 2 provides the context for this finding.
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Taken together, the Yatir and Chile examples illustrate that water outcomes can differ with place and intervention. Neither case provides a general rule that planting trees will consume all available water or that replacing a plantation will raise base flow by a particular amount elsewhere. For a real proposal, ask for local estimates of precipitation, recharge, streamflow and demand, and for monitoring that can compare results with a baseline.
How planting can harm native ecosystems
Afforestation establishes forest on land that was not historically forested. Reforestation restores forest on land that previously contained it. The distinction matters: adding trees to natural grassland, shrubland, wetland, or another native open ecosystem can convert valuable habitat rather than restore a forest.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThe IPCC reports that biodiversity impacts depend largely on the vegetation cover being replaced: “impacts on biodiversity depend mostly on the vegetation cover that is replaced.” Afforestation of naturally non-tree-dominated ecosystems can have negative effects on biodiversity. A project should therefore begin by identifying the ecosystem already present—not by treating every treeless area as degraded or available for planting. See the IPCC discussion of large-scale conversion from non-forest to forest.
This is why a tree-planting target or a map of apparently open land is not, by itself, evidence that planting is appropriate. Grasslands, shrublands, wetlands, and other open habitats can be native ecosystems with their own biodiversity and ecological functions. Converting them to forest changes the habitat rather than simply adding trees to an empty space. The decision should reflect what the land is and what is already using it.
Why monocultures and non-native species can be a poor substitute
A large stand of one tree species can create simpler habitat than a natural forest and is not equivalent to restoring the structure and biodiversity of a native ecosystem. The IPCC notes that non-native monocultures offer little biodiversity benefit. It also identifies Acacia and Pinus among plantation genera that can become invasive in some contexts; that is a context-dependent risk, not a claim that every planting of these genera will spread invasively.
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The concern is not simply whether a tree is non-native. It is whether the species and planting design suit the landscape, whether the trees can spread beyond the site, and whether the planted stand displaces native habitat. A species may be used in a plantation in one context without becoming invasive, but the possibility of invasion is one of the effects that a proposal should assess and monitor. Likewise, a diverse planting does not make an unsuitable location appropriate for afforestation.
FAO guidance says planted forests should not replace primary forest, ecologically significant secondary forest, or other important ecosystems, and that planted forests cannot replace natural-forest biodiversity. Existing high-value habitats—including wetlands, riparian vegetation, and native forest remnants—should be protected before new tree cover is proposed. FAO’s voluntary guidelines for responsible management of planted forests set out these safeguards.
Local ecological changes can reach beyond the planted area
In the Yatir example, FAO also reports changes in regional biodiversity and new predation dynamics that threatened endemic species. This is evidence of a site-specific ecological effect, not proof that every planting will produce the same change. It does show why assessment should consider local species and ecological interactions, not just the trees planted within a project boundary.
A boundary around a planting does not necessarily contain its effects. Water flows, invasive species, and wildlife interactions can extend into the surrounding landscape. This is one reason to identify nearby native habitats and species before planting, and to monitor for changes beyond the project site rather than counting only tree survival inside it.
How to assess a tree-planting proposal
A sound proposal starts with environmental and social baselines, then compares the likely effects of planting with the effects of protecting or restoring the existing landscape. FAO recommends locally adapted indigenous species where suitable, careful attention to water demand, and consideration of both surface water and groundwater. Its guidance also warns that heavy equipment can compact soil and impede hydrology. Use the following checks before supporting a project:
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- Identify the starting ecosystem. Establish whether the land was formerly forested and is suitable for forest recovery, or whether it is naturally open, wetland, or another high-value habitat that should remain unplanted. Check for primary forest, ecologically significant secondary forest, native grassland, wetlands, and riparian areas. Do not assume that land without tree cover is degraded.
- Build a local water balance. Document precipitation, groundwater recharge, streamflow, seasonal shortages, and existing water demand. Estimate how the project could affect water as trees mature, and identify who depends on the same catchment. Assess both surface water and groundwater, including possible effects beyond the planting boundary.
- Check species and planting design. Determine whether species suit local soils and water conditions, whether they are native or otherwise demonstrably appropriate, and whether their water demand and density fit the site. Consider the risks of high-water-demand species in water-stressed areas and the possible spread of species that can be invasive. A diverse design does not automatically solve a poor location choice.
- Protect landscape connections. Keep natural forest remnants, wetlands, and riparian reserves intact and connected. Evaluate potential effects outside the planting boundary, including changes to water flows, invasive species, and wildlife interactions. A plantation should not be treated as a substitute for natural forest or other high-value ecosystems.
- Recognize land and water rights. Establish who uses the land and water for farming, grazing, food, fuel, or cultural purposes. Involve affected local and Indigenous communities, recognize their rights, and include social as well as environmental baselines in planning. A planting proposal can affect people who rely on the same land and catchment even if they are outside the project area.
- Plan and fund long-term management. Set out how the planting will be maintained and monitored over its life. Track water quantity and quality, biodiversity, invasive species, and unintended effects beyond the planted area; define who will act if monitoring identifies harm. Include the potential effects of construction and heavy equipment, since soil compaction can impede hydrology.
These checks help distinguish a proposal to restore appropriate forest from one that simply maximizes planted area. They also make clear what evidence a project should provide: a baseline, a description of the habitat and water users, a reason for the chosen species and density, and a plan to respond if monitoring finds undesirable effects. If those elements are missing, tree counts alone cannot establish that the project is suitable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the evidence can—and cannot—tell you
The available assessments do not establish a universal global percentage for water loss or biodiversity change from large-scale planting. Results depend on the location, ecosystem converted, species, planting design, and management. The Yatir water account and Chile base-flow finding are useful illustrations of possible outcomes, but neither supplies an effect size that can be applied to another site.
For a specific project, the useful evidence is local: a baseline of water availability and demand; a clear map of the habitat being replaced or restored; species and density plans; and a funded monitoring and management plan. Without those details, a tree count alone cannot show whether a proposal will protect water or benefit native ecosystems.
Frequently Asked Questions
Can large-scale tree planting cause water shortages?
It can reduce streamflow or groundwater availability, particularly in dry or water-stressed areas, because trees use water and may intercept rainfall. The size and direction of the effect depend on local water availability, species, density, site conditions, and management; there is no universal percentage that applies everywhere.
What is the difference between afforestation and reforestation?
Afforestation establishes forest on land that was not historically forested. Reforestation restores forest on land that previously contained it. The distinction matters because planting trees in naturally open grassland, shrubland, or wetland can damage native habitat rather than restore forest.
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Can tree planting harm grassland biodiversity?
Yes. The IPCC reports that biodiversity effects depend largely on the vegetation cover replaced, and that afforestation of natural non-tree-dominated ecosystems can have negative effects. A treeless area should not automatically be treated as degraded or suitable for planting.
Do trees always improve water quality or reduce floods?
No. Well-planned planted forests integrated with watershed management may improve water quality, reduce erosion and sedimentation, stabilize soil, and help regulate flows. These conditional benefits do not mean every planting reduces floods, increases streamflow, or increases water available to users.
What should I check before supporting a planting project?
Check the starting ecosystem, local precipitation and water balance, groundwater and streamflow, seasonal shortages and existing users, proposed species and density, and protections for forests, wetlands, and riparian areas. Also ask whether affected local and Indigenous people have been involved, whether their rights are recognized, and whether there is funded long-term monitoring of water, biodiversity, invasive species, and effects beyond the site.
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Large-scale tree planting is not automatically good or bad for water and biodiversity. It can reduce water available to streams and groundwater in water-stressed catchments, and it can damage native open ecosystems or simplify habitat when poorly located or designed. Before planting, establish what ecosystem belongs on the land, assess the local water balance and community needs, protect existing high-value habitats, and fund long-term monitoring. The goal should be appropriate restoration and water stewardship—not simply a higher tree count.
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