China's Yellow River Basin has gained roughly 35,000 square kilometres of planted forest over the past three decades, but a study of nearly 20 years of monitoring data suggests some of those forests begin losing their carbon-sequestration momentum far earlier than their expected maturity. Research published in Scientific Reports titled Analysis of 20 years of monitoring data reveals insufficient carbon sequestration potential of planted forests in dryland regions found that annual net primary productivity, a measure used to assess vegetation carbon fixation, shifted from increasing to declining within 15 years of planting in more than 80% of the areas where planted forests expanded. In nearly half of those areas, the decline began within 10 years. The finding comes from an analysis of the Yellow River Basin between 2001 and 2019, using annual net primary productivity and soil organic carbon datasets alongside land-cover and climate data. The researchers say increasing drought and limited water availability are among the factors restricting the long-term carbon gains of afforestation in this dryland region. This important research underscores the necessity of adapting restoration strategies to local environmental constraints, emphasizing that sustainable carbon sequestration requires careful planning rather than simply maximizing tree-planting efforts.
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