Agroforestry systems: Meta-analysis of soil carbon stocks, sequestration processes, and future potentials

作者：Shi, Lingling; Feng, Wenting; Xu, Jianchu; Kuzyakov, Yakov^*

来源：Land Degradation & Development, 2018, 29(11): 3886-3897.

DOI：10.1002/ldr.3136

• agroforestry management
• carbon sequestration
• ecosystem services
• homegardens
• meta-analysis
• sustainable land use

Agroforestry (AF) has the potential to restore degraded lands, provide a broader range of ecosystem goods and services such as carbon (C) sequestration and high biodiversity, and increase soil fertility and ecosystem stability through additional C input from trees, erosion prevention, and microclimate improvement. Advantages and processes for global C sequestration in AF are unknown. We used a meta-analysis of 427 soil C stock data pairs grouped into four main AF systems-alley cropping, windbreaks, silvopastures, and homegardens-and evaluated changes in AF and adjacent control cropland or pasture. Mean soil C stocks in AF (1-m depth) were 126 Mg C center dot ha(-1), which is 19% more than that in cropland or pasture. The highest C stocks in soil were in subtropical homegardens, AF with younger trees, and topsoil (0-20 cm). Increased soil C stocks in AF were lower than aboveground C stocks in most AF systems, except alley cropping. Homegardens stored the highest C in both aboveground and belowground, especially in the subsoil (20-100 cm). Advantages of AF ecosystem services focusing on mechanisms of belowground C sequestration were analyzed. AF could store 5.3 x 10(9) Mg additional C in soil on 944 Mha globally, with most in the tropics and subtropics. AF systems could greatly contribute to global soil C sequestration if used in larger areas. Future investigations of AF should include (a) mechanistic- and process-based studies (instead of common monitori

• 出版日期2018-11
• 单位中国科学院昆明植物研究所; 中国农业科学院农业资源与农业区划研究所