Long-Term Evaluation of Restoration Outcomes Under China’s Shan-Shui Initiative

China’s landmark Shan-Shui Initiative, launched to protect and restore landscapes across mountains, rivers, forests, farmland, lakes, grasslands and deserts, has delivered a visible greening signal in many early project zones. Yet a new long-term satellite-based assessment suggests that “greener” does not automatically mean “ecologically better” in the same way everywhere.

Researchers evaluated 25 early Shan-Shui projects selected for implementation between 2016 and 2018, using remote sensing and climate observations spanning 2011–2024. Instead of relying on vegetation greenness alone, the team tracked how restoration-related conditions evolved across multiple ecological dimensions after projects began.

A key element of the work was an improved Remote Sensing Ecological Index (kRSEI). The index integrates several satellite-derived components—greenness, wetness, dryness and heat—aiming to represent changes in regional ecosystem functioning observable from space. This approach is designed to capture moisture availability, thermal stress and water-related dynamics that greenness-only metrics may miss.

The analysis found that vegetation greenness increased significantly in 14 of the 25 areas. However, kRSEI trends did not always move in parallel with greenness, indicating that vegetation recovery and broader ecosystem conditions can diverge over time.

To interpret these mismatches, the researchers applied China’s “Three Eco-zones and Four Shelterbelts” national ecological security framework. Their results showed distinct restoration pathways depending on land context and ecological background, rather than uniform responses across the national program.

Where both greenness and kRSEI increased, forests, grasslands and croplands contributed differently across ecological settings. Forest gains were more prominent in humid areas with strong forest backgrounds, whereas grassland improvements were larger in arid and semi-arid regions where water limitation shapes restoration outcomes.

In intensively managed agricultural landscapes, croplands also played an important role, pointing to the likelihood that farming practices, soil–water conservation measures and land-use adjustments influence whether restoration translates into improved ecosystem performance.

The study further linked kRSEI changes to climate-environmental drivers including temperature, precipitation, drought conditions and soil moisture. Among these factors, soil moisture showed the strongest association with the index, highlighting water availability and retention as critical for sustaining restoration gains under climate variability.

The authors conclude that future program evaluation should treat greenness as only one signal. By combining multiple satellite indicators, restoration planners can better compare outcomes across regions and design more climate-adaptive strategies for long-term ecological security.