Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi'an, 710075, China.
Sci Rep. 2017 Aug 2;7(1):7144. doi: 10.1038/s41598-017-07237-1.
Agro-ecosystems play an important role in regulating global changes caused by greenhouse gas emissions. Restoration of soil organic carbon (SOC) in agricultural soils can not only improve soil quality but also influence climate change and agronomic productivity. With about half of its land area under agricultural use, China exhibits vast potential for carbon (C) sequestration that needs to be researched. Chinese cropland has experienced SOC change over the past century. The study of SOC dynamics under different bioclimatic conditions and cropping systems can help us to better understand this historical change, current status, the impacts of bioclimatic conditions on SOC and future trends. We used a simulation based on historical statistical data to analyze the C balance of Chinese croplands during the 1980s and 1990s, taking into account soil, climate and agricultural management. Nationwide, 77.6% of the national arable land is considered to be in good condition. Appropriate farm management practices should be adopted to improve the poor C balance of the remaining 22.4% of cropland to promote C sequestration.
农业生态系统在调节温室气体排放引起的全球变化方面发挥着重要作用。恢复农业土壤中的土壤有机碳（SOC）不仅可以提高土壤质量，还可以影响气候变化和农业生产力。中国约有一半的土地用于农业，具有巨大的碳（C）固存潜力，需要进行研究。中国农田在过去一个世纪经历了 SOC 变化。研究不同生物气候条件和种植制度下的 SOC 动态，可以帮助我们更好地了解这一历史变化、现状、生物气候条件对 SOC 的影响和未来趋势。我们使用基于历史统计数据的模拟，考虑土壤、气候和农业管理，分析了 20 世纪 80 年代和 90 年代中国农田的 C 平衡。在全国范围内，有 77.6%的耕地被认为处于良好状态。应采取适当的农田管理措施，改善剩余 22.4%耕地的不良 C 平衡，促进 C 固存。
