image: Association and sensitivity of vegetation carbon uptake stability to resistance, recovery, and their interaction across drought-intensity gradients and aridity zones. (a) Association strength, expressed as adjusted R2, and (b) sensitivity of vegetation carbon uptake stability in arid and semi-arid regions defined by the aridity index.
Credit: Hang Xu, Jixian National Forest Ecosystem Observation and Research Station, National Ecosystem Research Network of China (CNERN), School of Soil and Water Conservation, Beijing Forestry University, Beijing, China
As droughts become more intense under climate change, dryland vegetation may face increasing difficulty in maintaining both strong drought resistance and rapid post-drought recovery. A new study suggests that severe drought can change how dryland vegetation responds to stress, with implications for vegetation stability.
The study, published in Forest Ecosystems, focused on the drylands of northern China, including the Three-North Shelterbelt Program region, the world’s largest ecological restoration project. These drylands play an important role in terrestrial carbon cycling, but they are also highly sensitive to water shortages.
Researchers used satellite data from 2001 to 2022 to track vegetation growth across the region. They used net primary productivity (NPP) as an indicator of vegetation productivity and carbon uptake. The team combined this with the Standardized Precipitation Evapotranspiration Index (SPEI), land-cover data, meteorological observations, and machine learning and statistical approaches to examine how vegetation responds during and after drought.
The study focused on two key abilities. One is resistance, indicating how well vegetation maintains its productivity during drought years. The other is recovery, reflecting how well vegetation regains its productivity after drought stress.
The researchers found that dryland vegetation with stronger resistance tended to show greater vegetation stability in carbon uptake over the long term. This highlights the important role of drought resistance in maintaining stable vegetation carbon uptake.
But the relationship between resistance and recovery changed as drought became more severe. Under moderate drought, vegetation with stronger resistance also tended to show stronger recovery. Under severe drought, this positive relationship shifted to a tradeoff: vegetation that resisted drought better often recovered more slowly, while vegetation that recovered faster tended to be less resistant during drought years.
Under extreme drought, this tradeoff was no longer evident. This suggests that extreme water stress may disrupt the usual coordination between resistance and recovery, potentially signaling increased vulnerability to drought.
The findings highlight the need to consider both drought resistance and recovery when assessing the future of dryland ecosystems. Looking at only one of these abilities may miss important signs of vulnerability.
The study also has implications for ecological restoration. In water-limited regions, restoration strategies should be matched to local drought conditions. Potential strategies may include selecting drought-tolerant species, optimizing planting density, improving soil moisture retention, and avoiding restoration approaches with excessive water demand.
DOI Link:
https://doi.org/10.1016/j.fecs.2026.100481
Journal
Forest Ecosystems
Article Title
Severe droughts alter the resistance–recovery tradeoff in the drylands of northern China
Article Publication Date
23-May-2026