鄧植儀基金講座
土壤污染生態(tài)學(xué)學(xué)術(shù)報告
報告題目：Nanoparticles in the Critical Zone: from Biofilms to Volcanoes
地球關(guān)鍵帶中納米顆粒的遷移轉(zhuǎn)化及歸趨：從微觀到宏觀的多尺度研究
報告人：Marc BENEDETTI 教授
主持人：李永濤教授
摘要：Nanoparticles (NPs) are essential components of the critical zone. They have been present from the origin of the Earth to modern humans, with life evolving in close association with natural NPs. This synergy began to change dramatically in the Anthropocene, since the industrial revolution accidental NPs (produced unintentionally by human activity) have been continuously distributed in the critical zone. In some regions, their fluxes are now comparable to the amount of naturally occurring NPs. This increase in nanoparticles production and use raises important concerns regarding their potential to negatively impact ecosystems. In this talk, the fate and transformation of NPs in the critical zone, ranged from bacterial biofilm/mineral interfaces to active volcanic region, will be discussed.
報告題目：Carbon Sequestration in Paddy Soils: Contribution and Mechanisms of Mineral-Associated SOC Formation
礦物結(jié)合態(tài)有機碳對水稻土中碳固存的貢獻及影響機制
報告人：翁莉萍研究員
主持人：李永濤教授
摘要：In this work, comparative study of paddy and upland soils were carried out to unravel mechanisms of enhanced soil organic carbon (SOC) sequestration in paddy soils using fractionation methods, 13C-NMR and Nano-SIMS analysis, as well as organic layer thickness calculations (Core-Shell model). The results showed that although there is a strong increase in particulate SOC in paddy soils compared to that in the upland soils, the increase in mineral-associated SOC is more important, explaining 60-75% of SOC increase in the paddy soils. The functioning of the “iron wheel” process stimulates accumulation of relatively young SOC into mineral-associated organic carbon pool, and reduces the difference in chemical structure between oxides-bound and clay-bound SOC. Further, the faster turnover of oxides and soil aggregates in paddy soil also facilities interaction between SOC and minerals. The formation of mineral-associated SOC may delay degradation of organic matter during both wet and dry period in the paddy field, therefore enhancing carbon sequestration in paddy soils.
報告人簡介：
Marc BENEDETTI,，法國巴黎地球物理學(xué)院-巴黎西岱大學(xué)（IPGP-Université Paris Cité）教授，法國國家科學(xué)研究院（CNRS）研究員,，美國化學(xué)學(xué)會（ACS）,、地球化學(xué)學(xué)會（GS）、美國地球物理聯(lián)合會（AGU）會士,。NICA-Donnan模型的創(chuàng)建者之一,，Donnan膜技術(shù)（DMT）的早期研究者，在采用新興分析技術(shù)（SC-DMT/IKE/HR-IPC-MS/ICP-TOF-MS）研究土壤及水體中痕量元素與膠體物質(zhì)之間相互作用方面具有豐富經(jīng)驗,。目前已在Nature,、Geochimica et Cosmochimica Acta、Environmental Science & Technology,、Water Research等高影響力期刊上發(fā)表180篇同行評審文章,，總引用數(shù)為14290。
翁莉萍,，農(nóng)業(yè)農(nóng)村部環(huán)境保護科研監(jiān)測所研究員,，博士生導(dǎo)師，農(nóng)田有機污染生物消減創(chuàng)新團隊高層次人才,，科技部“十三五”重點專項首席科學(xué)家。長期從事土壤元素化學(xué)形態(tài)與微界面過程研究,，創(chuàng)建了土壤養(yǎng)分與重金屬離子吸附的多表面模型,，發(fā)展了土壤顆粒交互作用的配體與電荷分配（LCD）模型,，建立了測定土壤自由態(tài)離子的Donnan膜技術(shù)（DMT），實現(xiàn)了復(fù)雜環(huán)境樣品中自由態(tài)離子的測定,，揭示了養(yǎng)分與污染元素的化學(xué)分布特征與生物有效性,，在國內(nèi)外土壤化學(xué)和土壤修復(fù)領(lǐng)域具有廣泛影響。
時間：2023年5月30日上午9:00-12:00
地點：華南農(nóng)業(yè)大學(xué)資源環(huán)境學(xué)院105報告廳
主辦：資源環(huán)境學(xué)院
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