ISPA, UMR 1391, Inrae Nouvelle-Aquitaine, Université de Bordeaux, Grande Ferrade, Villenave d'Ornon, France.
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Sci Adv. 2020 Feb 5;6(6):eaay4603. doi: 10.1126/sciadv.aay4603. eCollection 2020 Feb.
Severe drought and extreme heat associated with the 2015-2016 El Niño event have led to large carbon emissions from the tropical vegetation to the atmosphere. With the return to normal climatic conditions in 2017, tropical forest aboveground carbon (AGC) stocks are expected to partly recover due to increased productivity, but the intensity and spatial distribution of this recovery are unknown. We used low-frequency microwave satellite data (L-VOD) to feature precise monitoring of AGC changes and show that the AGC recovery of tropical ecosystems was slow and that by the end of 2017, AGC had not reached predrought levels of 2014. From 2014 to 2017, tropical AGC stocks decreased by Pg C due to persistent AGC losses in Africa ( Pg C) and America ( Pg C). Pantropically, drylands recovered their carbon stocks to pre-El Niño levels, but African and American humid forests did not, suggesting carryover effects from enhanced forest mortality.
与 2015-2016 年厄尔尼诺事件相关的严重干旱和极端高温导致热带植被向大气排放了大量碳。随着 2017 年气候条件恢复正常，热带森林地上碳（AGC）储量预计将因生产力提高而部分恢复，但这种恢复的强度和空间分布尚不清楚。我们使用低频微波卫星数据（L-VOD）来精确监测 AGC 的变化，并表明热带生态系统的 AGC 恢复缓慢，到 2017 年底，AGC 仍未达到 2014 年的干旱前水平。2014 年至 2017 年，由于非洲（ Pg C）和美洲（ Pg C）持续的 AGC 损失，热带 AGC 储量减少了 Pg C。在泛热带地区，旱地的碳储量已恢复到厄尔尼诺前水平，但非洲和美洲的湿润森林没有，这表明森林死亡率增加的滞后效应。
