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How forest age impacts on net primary productivity: Insights from future multi-scenarios

Forest Ecosystems 2024年第5期11卷 708-719页

作者： Lei Tian Yu Tao simms joanna Annikki Mäakelä Mingyang Li Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjingChina Faculty of Agriculture and Forestry University of HelsinkiHelsinkiFinland

Forest net primary productivity(NPP)constitutes a key flux within the terrestrial ecosystem carbon cycle and serves as a significant indicator of the forests carbon sequestration capacity,which is closely related to forest *** its significance,the impact of forest age on NPP is often ignored in future NPP ***,we mapped forest age in Hunan Province at a 30-m resolution utilizing a combination of Landsat time series stack(LTSS),national forest inventory(NFI)data,and the relationships between height and ***,NPP was derived from NFI data and the relationships between NPP and age was built for various forest *** forest NPP was predicted based on the NPP-age relationships under three future scenarios,assessing the impact of forest age on *** findings reveal substantial variations in forest NPP in Hunan Province under three future scenarios:under the age-only scenario,NPP peaks in 2041(133.56TgC·yr^(−1)),while NPP peaks three years later in 2044(141.14TgC·yr^(−1))under the natural development *** maximum afforestation scenario exhibits the most rapid increase in NPP,with peaking in 2049(197.95TgC·yr^(−1)).However,with the aging of the forest,NPP is projected to then decrease by 7.54%,6.07%,and 7.47%in 2060,and 20.05%,19.74%,and 28.38%in 2100,respectively,compared to their peaks under the three *** indicates that forest NPP will continue to decline *** the age structure of forests through selective logging,afforestation and reforestation,and encouraging natural regeneration after disturbance could mitigate this declining trend in forest NPP,but implications of these measures on the full forest carbon balance remain to be *** from the future multi-scenarios are expected to provide data to support sustainable forest management and national policy development,which will inform the achievement of carbon neutrality goals by 2060.

关键词： Net primary productivity Forest age NPP-Age relationships NPP projections Afforestation

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