10月29日: Urban soils as hotspots of anthropogenic carbon accumulation: Review of stocks, mechanisms and driving factors

报告人：Yakov Kuzyakov 教授

主持人：周小奇 教授

时  间：2018年10月29日 上午9：00开始
地  点：闵行校区 资环楼435室

Yakov Kuzyakov简介：Prof. Yakov Kuzyakov has been working as a director of Department of Soil Science of Temperate Ecosystems, and department of Agricultural Soil Science, University of Göttingen, Germany. As a famous soil ecologist, his research focuses on soil - plant - microorganisms interactions, such as priming effects, soil biogeochemistry cycling including C and N transformations. He has published a great number of papers, including 3 hot papers (top 0.1% citations) and 19+ highly cited papers (top 1% citations). Prof. Kuzyakov has acted as the member of the editorial board of top ranking journals, such as Global Change Biology, Soil Biology & Biochemistry, European Journal of Soil Biology, Biogeosciences, Land Degradation and Development, etc. For more information, welcome to his website: http://www.uni-goettingen.de/en/212970.html

报告内容简介：Urban soils accumulate carbon (C) in deep horizons over centuries and consequently large C stocks may be sequestered beneath cities. Data on soil organic carbon (SOC), soil inorganic carbon (SIC), black (pyrogenic) carbon (BC) and nitrogen (N) contents and stocks in urban soils was collected from 100 peer-reviewed papers. For the wide range of climatic conditions, total C content in urban soils was 1.5-3 times higher and C accumulation was much deeper compared to natural soils, resulting in 3-5 times larger total C stocks. Long-term С input from outside the cities and associated C accumulation coincided with upward soil growth of ~ 50 cm per century, and continuous accumulation of 15-30 kg C m-2 per century in urban soils and cultural layers. We conclude that, despite the relatively small area of cities (2.5%), urban soils are hotspots of long-term soil C sequestration worldwide (between 7 and 13%), and the importance of urban soils will increase in future with global urbanization.