Soil respiration (Rs) refers to the process of CO₂ release from soil. Strictly defined, it encompasses all metabolic processes generating CO₂ in undisturbed soil, including three biological processes (soil microbial respiration, root respiration, soil fauna respiration) and one abiological process (chemical oxidation of carbon-containing minerals). It is the second-largest carbon flux component in terrestrial ecosystem carbon cycles, following gross primary productivity, and plays a critical role in carbon cycling and budgets of terrestrial ecosystems. The Global 1km annual soil respiration product includes annual soil respiration data from 2000 to 2020, with a temporal resolution of 1 year, provided in NetCDF format. The model was developed using publicly available global soil respiration ground observation datasets and multi-source remote sensing data. Based on global climate zones and vegetation type data, and considering the availability of ground observation records, global terrestrial ecosystems were divided into 10 biomes: temperate evergreen coniferous forests, temperate evergreen broadleaf forests, temperate deciduous coniferous forests, temperate deciduous broadleaf forests, temperate mixed forests, boreal vegetation regions, tropical forests, grasslands, shrubs, and croplands. For each biome, soil respiration was estimated using multivariate nonlinear regression, support vector machine regression, artificial neural networks, and random forests, based on remote sensing data related to temperature, moisture, and vegetation productivity. The optimal model for each biome was selected based on coefficients of determination and root mean square errors obtained via 10-fold cross-validation. Detailed calculation steps are provided in (Huang et al., 2020).
Spatial Distribution Map of Global Average Soil Respiration (2000-2020)
Core Functions
This product provides data support for global change and carbon cycle research.
References
Huang, N., Wang, L., Song, X.-P., Black, T. A., Jassal, R.S., Myneni, R.B., Wu, C., Wang, L., Song, W., Ji, D., Yu, S., Niu, Z. Spatial and temporal variations in global soil respiration and their relationships with climate and land cover. Science Advances. 6, eabb8508 (2020).
https://zenodo.org/record/5909563#.YleA7uhByUk
https://www.geodata.cn/main/face_science_detail?typeName=face_science&guid=3103258
Product Owner Introduction
Huang Ni, Associate Professor and Master's Supervisor at the Aerospace Information Research Institute, Chinese Academy of Sciences. Her research focuses on remote sensing inversion of carbon cycle parameters in terrestrial ecosystems. She has led projects supported by the National Natural Science Foundation of China and the National Key R&D Program.
Contact Information
Huang Ni (huangni@aircas.ac.cn)
