A mathematical model based on canopy light-use strategy captures 81% of observed variations in global vegetation greenness, according to research published in Nature Communications.
The study tested whether fractional canopy light absorption, known as fAPAR, tracks the seasonal dynamics of potential production, termed A0. A0 represents theoretical canopy carbon uptake when all available light is absorbed. Plant optimality principles indicate that vegetation builds canopy architecture to maximize light capture, deploying leaves when potential productivity peaks.
The researchers developed their predictive framework to determine fAPAR directly from the seasonal cycle of A0. Their model incorporates a phenological lag that scales with moisture, extending from two weeks in drier conditions to three months in higher moisture regimes. The analysis established that light availability and environmentally regulated biophysical constraints drive global vegetation greenness, its seasonal phenology, and its recent increases.
Authors on the paper include Z. Zhu, H. Wang, B. Zhou, W. Cai, Sandy P. Harrison, Martin G. De Kauwe, and I. Colin Prentice. Participating institutions include Tsinghua University's Department of Earth System Science, Space Star Technology Company Ltd., Imperial College London's Georgina Mace Centre for the Living Planet, the University of Reading, and the University of Bristol.
Nature Communications received the paper on April 2, 2025, accepted it on August 9, 2026, and published it on August 21, 2026. Financial support came from the National Key Research and Development Program of China under grant 2024YFF0729103, the National Natural Science Foundation of China under grant 42361144875, the Hainan Institute of National Park Research Program, the UK Natural Environment Research Council under grant NE/W010003/1, Schmidt Sciences, and the European Research Council under Horizon 2020 project 787203 REALM.
