Forests are chiefly responsible for the terrestrial carbon sink that greatly re duces the buildup of CO_(2)concentrations in the atmosphere and alleviates climate change.Current predictions of terrestrial carbon sinks...Forests are chiefly responsible for the terrestrial carbon sink that greatly re duces the buildup of CO_(2)concentrations in the atmosphere and alleviates climate change.Current predictions of terrestrial carbon sinks in the future have so far ignored the variation of forest carbon uptake with forest age.Here,we predict the role of China's current forest age in future carbon sink capacity by generating a high-resolution(30 m)forest age map in 2019 over China's landmass using satellite and forest inventory data and deriving forest growth curves using measurements of forest biomass and age in 3,121 plots.As China's forests currently have large proportions of young and middle-age stands,we project that China's forests will maintain high growth rates for about 15 years.However,as the forests grow older,their net primary productivity will decline by 5.0%±1.4%in 2050,8.4%±1.6%in 2060,and 16.6%±2.8%in 2100,indicating weakened carbon sinks in the near future.The weakening of forest carbon sinks can be potentially mitigated by optimizing forest age structure through selective logging and implementing new or improved afforestation.This finding is important not only for the global carbon cycle and climate projections but also for developing forest management strategies to enhance land sinks by alleviating the age effect.展开更多
DEAR EDITOR,Ancient DNA(a DNA) from mollusc shells is considered a potential archive of historical biodiversity and evolution.However, such information is currently lacking for mollusc shells from the deep ocean, espe...DEAR EDITOR,Ancient DNA(a DNA) from mollusc shells is considered a potential archive of historical biodiversity and evolution.However, such information is currently lacking for mollusc shells from the deep ocean, especially those from acidic chemosynthetic environments theoretically unsuitable for longterm DNA preservation. Here, we report on the recovery of mitochondrial and nuclear gene markers by Illumina sequencing of a DNA from three shells of Archivesica nanshaensis – a hydrocarbon-seep vesicomyid clam previously known only from a pair of empty shells collected at a depth of 2626 m in the South China Sea.展开更多
The abrupt outbreak of coronavirus disease in 2019,also known as COVID-19,has led to an unprecedented global public healthcrisis.Current studies have paid immense attention to the impacts of COVID-19 posed to the atmo...The abrupt outbreak of coronavirus disease in 2019,also known as COVID-19,has led to an unprecedented global public healthcrisis.Current studies have paid immense attention to the impacts of COVID-19 posed to the atmosphere and the land-based sectors in areas such as air quality,carbon emission,economic senti ment,educational and social equality,etc.It is depicted that carbon emission had dropped about 8.8%in the first half of 2020 compared to 2019,'significant reduc-tion of air pollutants such as PM25 and NO2 were moreover reported at national,regional,and global levels.On the flip side,the amount of attention paid to the ocean during this pandemic has been nearly negligible despite its prominent functions of supporting livelihoods for 40%of the global population,absorbing~30%of anthropogenic CO_(2)emissions,and processing over 90%of excess heat in our climate system.Both direct and indirect effects of the pandemicare insufficiently understood in the ocean,which include their key roles in blue carbon sequestration,ocean-atmosphere and ocean-land interactions,sealevel changes,and their impacts to human beings.展开更多
基金National Natural Science Foundationof China(grant nos.42101367 to R.S.and 42201360 to M.X.)Natural Science Foundation of Fujian Province(grant no.2021J05041 to R.S.)+1 种基金Fujan Forestry Science and Technology Key Project(grant no.2022FKJ03 to R.S)Open Fund Project of the Academy of Carbon Neutrality of Fujian Normal University(grant no.TZH2022-02 to R.S).
文摘Forests are chiefly responsible for the terrestrial carbon sink that greatly re duces the buildup of CO_(2)concentrations in the atmosphere and alleviates climate change.Current predictions of terrestrial carbon sinks in the future have so far ignored the variation of forest carbon uptake with forest age.Here,we predict the role of China's current forest age in future carbon sink capacity by generating a high-resolution(30 m)forest age map in 2019 over China's landmass using satellite and forest inventory data and deriving forest growth curves using measurements of forest biomass and age in 3,121 plots.As China's forests currently have large proportions of young and middle-age stands,we project that China's forests will maintain high growth rates for about 15 years.However,as the forests grow older,their net primary productivity will decline by 5.0%±1.4%in 2050,8.4%±1.6%in 2060,and 16.6%±2.8%in 2100,indicating weakened carbon sinks in the near future.The weakening of forest carbon sinks can be potentially mitigated by optimizing forest age structure through selective logging and implementing new or improved afforestation.This finding is important not only for the global carbon cycle and climate projections but also for developing forest management strategies to enhance land sinks by alleviating the age effect.
基金supported by the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(SMSEGL20SC02)University Grants Committee of Hong Kong(GRF12102222)。
文摘DEAR EDITOR,Ancient DNA(a DNA) from mollusc shells is considered a potential archive of historical biodiversity and evolution.However, such information is currently lacking for mollusc shells from the deep ocean, especially those from acidic chemosynthetic environments theoretically unsuitable for longterm DNA preservation. Here, we report on the recovery of mitochondrial and nuclear gene markers by Illumina sequencing of a DNA from three shells of Archivesica nanshaensis – a hydrocarbon-seep vesicomyid clam previously known only from a pair of empty shells collected at a depth of 2626 m in the South China Sea.
基金supported by Major Program of the National Natural Science Foundation of China(42090015 and 72091514)the National Natural Science Foundation of China(42071400)+3 种基金the University of Hong Kong HKU-100 Scholars FundURC Seed Fund for Strategic Interdisciplinary Research SchemeSeed Fund for Basic ResearchTsinghua-Toyota Joint Research Fund。
基金supported by the National Natural Scierce Foundation ofChina(Grant Nos 42101249 and 42022061)the Hui Oi-Chow Trust Fund(gant#263690561.114525.30900.400.01)of the University of Hong Kong.
文摘The abrupt outbreak of coronavirus disease in 2019,also known as COVID-19,has led to an unprecedented global public healthcrisis.Current studies have paid immense attention to the impacts of COVID-19 posed to the atmosphere and the land-based sectors in areas such as air quality,carbon emission,economic senti ment,educational and social equality,etc.It is depicted that carbon emission had dropped about 8.8%in the first half of 2020 compared to 2019,'significant reduc-tion of air pollutants such as PM25 and NO2 were moreover reported at national,regional,and global levels.On the flip side,the amount of attention paid to the ocean during this pandemic has been nearly negligible despite its prominent functions of supporting livelihoods for 40%of the global population,absorbing~30%of anthropogenic CO_(2)emissions,and processing over 90%of excess heat in our climate system.Both direct and indirect effects of the pandemicare insufficiently understood in the ocean,which include their key roles in blue carbon sequestration,ocean-atmosphere and ocean-land interactions,sealevel changes,and their impacts to human beings.
