Increase in soil organic carbon by agricultural intensification in northern China

摘要: Abstract. Agricultural intensification has contributed greatly to the sustained food supply of China's population 1.3 billion over 30-year period from 1982 2011. Intensification several and widely recognized negative environmental impacts including depletion water resources, pollution bodies, greenhouse gas emissions soil acidification. However, there have been few studies this on organic carbon (SOC) at regional level. The present study was conducted in Huantai County, a typical intensive farming region northern China, analyze temporal dynamics SOC influenced by climate practices. results indicate that 2011, content density 0–20 cm layer cropland increased 7.8 ± 1.6 11.0 2.3 g kg−1 (41%) 21.4 4.3 33.0 7.0 Mg ha−1 (54%), respectively. stock (0–20 cm) farmland for entire county 0.75 1.2 Tg (59%). Correlation analysis revealed incorporation crop residues significantly SOC, while an increase mean annual temperature decreased Therefore, agricultural productivity sequestration China. In near future, more appropriate technologies practices must be developed implemented maintenance or enhancement elsewhere which also reduce non-CO2 emissions, since benefit additional storage is estimated smaller than N2O N fertilizer additions.