Nitrogen and water shifts push forest leaf timing in opposite directions
He Y, Li W, Qin Y, Su Y, Wang J
Phenology
The maples and oaks you watch change color each fall may shift their timing by weeks as nitrogen from car exhaust and agriculture continues to drift into forests, which means the autumn foliage window you plan hikes around is quietly moving.
Researchers added extra nitrogen and water to the tops of trees in a warm forest to mimic what's happening as pollution and rainfall patterns change. They found that different types of plants reacted in completely opposite ways: some trees leafed out later in spring, while certain shrubs actually colored up earlier in autumn. The effects weren't predictable or additive either, meaning nitrogen and water together sometimes canceled each other out instead of doubling up.
Key Findings
Canopy nitrogen addition delayed spring bud swelling in large trees by ~0.83 days and budburst in shrubs by ~1.50 days.
Water addition alone advanced spring bud swelling in small trees by 12.50 days, but combining it with nitrogen produced an antagonistic effect that partially reversed that advance.
Combined nitrogen and water addition synergistically delayed autumn leaf coloration and fall in large trees, while advancing peak and end of leaf coloration in shrubs by roughly 9-11 days.
chevron_right Technical Summary
Adding nitrogen and water to forest canopies does not simply speed up or slow down the seasonal timing of trees and shrubs — it produces opposite effects depending on the plant type, sometimes delaying spring leafing by days and shifting autumn color by nearly two weeks.
Abstract Preview
Original paper
Interactive canopy nitrogen and water additions delay phenology in a warm-temperate forest.
Plant phenology is a critical link between environmental change and ecosystem processes, representing a key indicator for evaluating plant growth and carbon sink dynamics under global change. Howev...
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