Carbon stock and sequestration of planted and natural forests along climate gradient in water-limited area: A synthesis in the China's Loess plateau

作者：Binbin Li, Guangyao Gao, Yiqi Luo, Mingxiang Xu, Guobin Liu, Bojie Fu · 发表于：Agricultural and Forest Meteorology · 年份：2023 · DOI：10.1016/j.agrformet.2023.109419 · 被引用次数：32 · 研究领域：Soil Carbon and Nitrogen Dynamics、Plant Water Relations and Carbon Dynamics、Forest ecology and management

Large-scale afforestation has been widely implemented for restoring the degraded lands and mitigating climate change while naturally regenerated forests should be protected to preserve carbon (C) in land ecosystems. However, a critically needed comparison on the effectiveness of C sequestration between planted forest (PF) and natural forest (NF) in water-limited areas has rarely been conducted at a regional scale. This study synthesized 275 publications to examine the changes of C stock in above-ground biomass (AGB), below-ground biomass (BGB) and deep soils (0-200 cm) between PF and NF in the China's Loess Plateau, a typical water-limited region with extensive afforestation. We found that, NF stored more than twice as much C as did PF in both biomass and soil. But PF allocated relatively higher proportion of C stock to BGB and deep soil layer (> 100 cm) than NF. Moreover, the C sequestration rates in biomass and soil for PF were 1.42 and 1.72 Mg C ha −1 yr −1 , respectively, much higher than that of NF (0.13 and -1.38 Mg C ha −1 yr −1 ). In addition, afforestation in areas with the mean annual precipitation (MAP) greater than 505 mm may promote both biomass and soil C accumulation without causing severe soil water deficit . Moreover, the increase in mean annual temperature (MAT) could significantly promote the C accumulation in both biomass and soil of PF but accelerated the soil C loss of NF. Overall, our results indicate that afforestation in water-limited areas may exhibi...