How Heat Affects Trees Along City Streets
BACOLOD - Trees growing along busy roads and in exposed public spaces experience direct sunlight and heat absorbed by nearby concrete, asphalt, and buildings. During particularly hot periods, leaves may lose water faster through transpiration, the natural process that helps regulate a tree's temperature. When roots cannot absorb enough moisture to replace that water, some trees may respond by closing tiny openings on their leaves, reducing water loss but also slowing photosynthesis. Prolonged stress can cause leaves to wilt, curl, dry out, or fall earlier than usual. These effects can be more noticeable in young trees and species that are not well suited to exposed urban conditions.
Why Soil and Water Conditions Matter
The condition of the ground around a tree plays a major role in how it handles hot weather. Limited soil space, compacted ground, and paved surfaces can restrict root growth and reduce the amount of rainwater that reaches the roots. When rainfall becomes less frequent, trees may struggle to access enough moisture, particularly when they are surrounded by hard surfaces that absorb and retain heat. Proper watering, adequate planting space, organic mulch, and healthy soil can help reduce these challenges. However, watering should be appropriate for the tree species and soil conditions, since excessive moisture can also damage roots.
Keeping Bacolod’s Urban Greenery Healthy
Maintaining healthy urban trees requires attention beyond the hottest part of the year. Choosing suitable native or locally adapted species, protecting root zones, providing sufficient growing space, and inspecting trees for damaged branches or signs of disease can improve their chances of surviving changing weather conditions. Residents can also help by avoiding damage to trunks and roots, reporting hazardous trees, and supporting responsible planting and maintenance programs. With consistent care from communities and city maintenance teams, trees can continue providing shade, supporting urban wildlife, improving public spaces, and making Bacolod's neighborhoods more comfortable.
