Post-agricultural restoration of soil organic carbon pools across a climate gradient

Post-agricultural natural restoration is a worldwide strategy for eco-environmental sustainability. However, it is unclear how it affects soil organic carbon (SOC) pools and composition among soil types across climate gradient. Here, we investigated 23-year post-agricultural restorations of SOC in three soils: Luvic Phaeozem, Calcaric Cambisol and Ferralic Cambisol typical for mid-temperate, warm-temperate and subtropical zones, respectively. Six SOC fractions with different protection mechanisms (non-protected, physically, chemically, biochemically, physico-chemically and physico-biochemically) were separated. Compared with pre-restoration in 1990, post-agricultural restoration rebuilt SOC similarly (+68–+91%) among the three soils despite of different SOC background. Compared with continuous cultivation, post-agricultural restoration increased total SOC pools in all the three soils (+33–+60%) mainly because of the increments of non-protected pool (coarse particulate organic C, cPOC). However, the pure physically, chemically, and biochemically protected SOC fractions were less sensitive to post-agricultural restoration. The physico-biochemically protected SOC was hampered by restoration in the two temperate soils but remained stable in the subtropical soil, suggesting a divergent self-restoring trend. Positive correlations of the total SOC and most fractions with wetness (precipitation/temperature ratio) demonstrated the climate dependency of SOC. In conclusion, post-agricultural natural restoration builds up SOC pool mainly due to the cPOC increment and shifts SOC composition towards more easily available C in three soils across the climatic gradient. © 2021 Elsevier B.V.

Wang Y.1, 2 , Xue D.1, 2 , Hu N.3 , Lou Y.4 , Zhang Q.4 , Zhang L.4 , Zhu P.5 , Gao H.5 , Zhang S. 6 , Zhang H.7 , Li D.7 , Song Z.8 , Kurganova I.9 , Kuzyakov Y. 1, 10, 11 , Wang Z.-L.1, 2
Elsevier B.V.
  • 1 Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China
  • 2 School of Geographic and Environmental Sciences, Tianjin Normal University, Tianjin, 300387, China
  • 3 Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, United States
  • 4 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
  • 5 Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun, 130001, China
  • 6 Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China
  • 7 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
  • 8 Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, 300072, China
  • 9 Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, Moscow, 142290, Russian Federation
  • 10 Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, Goettingen, 37077, Germany
  • 11 Agro-Technological Institute, RUDN University, Moscow, 117198, Russian Federation
Ключевые слова
Land use; Natural vegetation restoration; Particulate organic matter; Physical and biochemical protection; Soil organic matter fractionation
Дата создания
Дата изменения
Постоянная ссылка

Другие записи