State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China.
Sci Rep. 2018 Jun 18;8(1):9278. doi: 10.1038/s41598-018-27631-7.
Carbon emissions from human and animals has been neglected by previous studies in estimating the carbon cycle of ecosystem. This study first estimates the spatial-temporal patterns of carbon emissions density from human and livestock respiration among countries around the world from 1960-2014. Then we simulate the soil heterotrophic respiration (R) to analyze the contribution of human and livestock respiration to total heterotrophic respiration of global ecosystem. Our results show that the respiration of human and livestock respectively contribute more than 1% of the total carbon output from heterotrophic respiration in most countries and affect more than 5% in almost half of the countries. Moreover, the effect of livestock respiration is slightly greater than that of human beings. Therefore, the estimation of heterotrophic respiration should not only consider R in these countries, human and livestock respiration are equally important in the research on regional carbon budget.
以往的生态系统碳循环研究忽视了人类和动物的碳排放。本研究首次估算了 1960-2014 年期间全球各国人类和牲畜呼吸产生的碳排放密度的时空分布。然后，我们模拟土壤异养呼吸（R），分析人类和牲畜呼吸对全球生态系统总异养呼吸的贡献。结果表明，在大多数国家，人类和牲畜的呼吸分别贡献了超过 1%的异养呼吸总碳输出，在近一半的国家中影响超过 5%。此外，牲畜呼吸的影响略大于人类。因此，在这些国家的异养呼吸估算中，不仅应考虑 R，还应考虑人类和牲畜呼吸在区域碳预算研究中同样重要。
