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7年穿透雨减少对锐齿槲栎光合固碳及生物量碳储量的影响

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生态学报 2024年第5期44卷 1904-1917页

作者：刘翠菊陈志成刘世荣高小敏牛保亮刘晓静白兵勇中国林业科学研究院森林生态环境与自然保护研究所国家林业和草原局森林生态环境重点实验室北京100091 河南宝天曼森林生态系统国家野外科学观测研究站南阳473000 河南宝天曼国家级自然保护区管理局内乡474350

气候变化背景下不断加剧的干旱事件对树木的生长及碳积累产生显著影响。然而,树木光合固碳能力及生物量碳储量对相对长期干旱的连续响应机制的研究仍然有限。选择70年生的天然锐齿槲栎(Quercus aliena ***)林,探究长期模拟穿透雨减少对... 详细信息

气候变化背景下不断加剧的干旱事件对树木的生长及碳积累产生显著影响。然而,树木光合固碳能力及生物量碳储量对相对长期干旱的连续响应机制的研究仍然有限。选择70年生的天然锐齿槲栎(Quercus aliena ***)林,探究长期模拟穿透雨减少对锐齿槲栎光合固碳潜力和生物量碳储量的影响。研究结果表明,连续7年的穿透雨减少处理显著降低了锐齿槲栎的光合固碳能力,其叶片净光合速率(A)、最大羧化速率(V_(cmax))、最大电子传递速率(J_(max))、最大光化学效率(F_(v)/F_(m))均明显降低,且穿透雨减少处理增强了A与气孔导度(g_(s))、J_(max)、F_(v)/F_(m)之间的相关性。在适应长期干旱过程中,锐齿槲栎通过增加比叶面积(SLA)、叶片栅栏组织与海绵组织的比值、气孔密度等叶片形态及结构特性变化,降低冠层叶面积(LAI)指数和蒸腾水分散失及提高水分利用效率(WUE)缓解和适应干旱胁迫的不利影响。但是,长期穿透雨减少仍然降低了锐齿槲栎的生物量碳储量。穿透雨减少处理7年后,叶生物量碳下降30.6%、茎生物量碳下降34.3%、地下生物量碳下降26.4%,总生物量碳下降32.8%。同时,地下/地上生物量碳比值显著提高,表明锐齿槲栎通过增加地下碳投入和生长适应干旱胁迫。在未来降雨格局变化下,锐齿槲栎生长及叶性状的适应性调整是该树种能够长期生存的重要策略。研究为评价全球气候干化背景下暖温带锐齿槲栎林光合固碳能力和碳储量的变化提供了科学依据。

关键词：气候变化降雨减少光合作用水分利用效率碳储量

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Durable Ru Nanocrystal with HfO_(2)Modification for Acidic Overall Water Splitting

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Nano-Micro Letters 2024年第9期16卷 462-477页

作者： Xiangkai Kong Jie Xu zhicheng Ju Changle chen School of Materials and Physics China University of Mining and TechnologyXuzhou 221116JiangsuPeople’s Republic of China Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation Huaibei Normal UniversityHuaibei 235000AnhuiPeople’s Republic of China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026AnhuiPeople’s Republic of China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023JiangsuPeople’s Republic of China

Durable and efficient bi-functional catalyst,that is capable of both oxygen evolution reaction and hydrogen evolution reaction under acidic condition,are highly desired for the commercialization of proton exchange membrane water ***,we report a robust L-Ru/HfO_(2)heterostructure constructed via confining crystalline Ru nanodomains by HfO_(2)*** assembled with a proton exchange membrane,the bi-functional L-Ru/HfO_(2)catalyst-based electrolyzer presents a voltage of 1.57 and 1.67 V to reach 100 and 300 mA cm^(-2)current density,prevailing most of previously reported Ru-based materials as well as commercial Pt/C||RuO_(2)*** is revealed that the synergistic effect of HfO_(2)modification and small crystalline domain formation significantly alleviates the over-oxidation of *** importantly,this synergistic effect facilitates a dual-site oxide path during the oxygen evolution procedure via optimization of the binding configurations of oxygenated *** a result,the Ru active sites maintain the metallic state along with reduced energy barrier for the rate-determining step(^(*)O→^(*)OOH).Both of water adsorption and dissociation(Volmer step)are strengthened,while a moderate hydrogen binding is achieved to accelerate the hydrogen desorption procedure(Tafel step).Consequently,the activity and stability of acidic overall water splitting are simultaneously enhanced.

关键词： Ruthenium Hafnium dioxide Oxygen evolution catalysis Anti-oxidation

Multi-year throughfall reduction enhanced the growth and non-structural carbohydrate storage of roots at the expenses of above-ground growth in a warm-temperate natural oak forest

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Forest Ecosystems 2023年第3期10卷 357-367页

作者： Cuiju Liu zhicheng chen Shirong Liu Kunfang Cao Baoliang Niu Xiaojing Liu Xiaomin Gao Key Laboratory of Forest Ecology and Environment National Forestry and Grassland AdministrationEcology and Nature Conservation InstituteChinese Academy of ForestryBeijing100091China Baotianman Forest Ecosystem Research Station Nanyang473000China Guangxi Key Laboratory of Forest Ecology and Conservation College of ForestryGuangxi UniversityNanning530004China Henan Baotianman Nature Reserve Administration Neixiang474350China

The more frequent occurrence and severer drought events resulting from climate change are increasingly affecting the physiological performance of trees and ecosystem carbon sequestration in many regions of the ***,our understanding of the mechanisms underlying the responses and adaption of forest trees to prolonged and multi-year drought is still *** address this problem,we conducted a long-term manipulative throughfall reduction(TFR,reduction of natural throughfall by 50%–70%during growing seasons)experiment in a natural oriental white oak(Quercus aliena *** Maxim.)forest under warm-temperate *** seven years of continuous TFR treatment,the aboveground growth in *** *** started to *** with the control plots,trees in the TFR treatment significantly reduced growth increments of stems(14.2%)and leaf area index(6.8%).The rate of net photosynthesis appeared to be more susceptible to changes in soil water in trees subjected to the TFR than in the *** TFR-treated trees allocated significantly more photosynthates to belowground,leading to enhanced growth and nonstructural carbohydrates(NSC)storage in *** 7-year continuous TFR treatment increased the biomass,the production and the NSC concentration in the fine roots by 53.6%,153.6%and 9.6%,*** were clear trade-offs between the aboveground growth and the fine root biomass and NSC storage in *** *** trees in response to the multi-year TFR treatment.A negative correlation between the fine root NSC concentration and soil water suggested a strategy of preferential C storage over growth when soil water became deficient;the stored NSC during water limitation would then help promote root growth when drought stress is *** findings demonstrate the warm-temperate oak forest adopted a more conservative NSC use strategy in response to long-term drought stress,with enhanced root growth and NSC storage at the exp

关键词： Climate change Carbon allocation Drought stress Forest ecophysiology Nonstructural carbohydrates Warm-temperate forests

Silicon photonic integrated interrogator for fiber-optic distributed acoustic sensing

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Photonics Research 2024年第3期12卷 465-473页

作者： zhicheng JIN JIAGENG chen YANMING CHANG QINGWEN LIU ZUYUAN HE State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Distributed acoustic sensing(DAS)technology has been a promising tool in various ***,the large size and relatively high cost of DAS equipment composed of discrete devices restrict its further popularization to some degree,and the photonic integration technology offers a potential *** this paper,we demonstrate an integrated interrogator for DAS on the silicon-on-insulator(SOI)*** design of the chip revolves around a Mach–Zehnder modulator(MZM)transmitter and a dual-quadrature and dualpolarization coherent *** integrated interrogator supports multiple DAS schemes,including the time-gated digital optical frequency domain reflectometry(TGD-OFDR),which is adopted for system performance evaluation.59■strain resolution in 12.1km sensing fiber with 1.14 m spatial resolution(SR)is ***,along 49.0 km sensing fiber,81■strain resolution with 3.78 m SR is *** results show that the integrated interrogator has comparable performance to the discrete DAS *** the best of our knowledge,this is the first dedicated on-chip DAS interrogator,which validates the effectiveness of the blend of photonics integration and DAS technology.

关键词： fiber polarization modulator

Group-specific functional patterns of mitochondrion-related organelles shed light on their multiple transitions from mitochondria in ciliated protists

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Marine Life Science & Technology 2022年第4期4卷 609-623页

作者： zhicheng chen Jia Li Dayana E.Salas-Leiva Miaoying chen Shilong chen Senru Li Yanyan Wu Zhenzhen Yi Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring Guangdong Provincial Key Laboratory for Healthy and Safe AquacultureSchool of Life ScienceSouth China Normal UniversityGuangzhou510631China Department of Biochemistry University of CambridgeCambridgeUK

Adaptations of ciliates to hypoxic environments have arisen independently several *** on mitochondrion-related organelle(MRO)metabolisms from distinct anaerobic ciliate groups provide evidence for understanding the transitions from mitochondria to MROs within *** deepen our knowledge about the evolutionary patterns of ciliate anaerobiosis,mass-culture and single-cell transcriptomes of two anaerobic species,Metopus laminarius(class Armophorea)and Plagiopyla ***(class Plagiopylea),were sequenced and their MRO metabolic maps were *** addition,we carried out comparisons using publicly available predicted MRO proteomes from other ciliate classes(i.e.,Armophorea,Litostomatea,Muranotrichea,Oligohymenophorea,Parablepharismea and Plagiopylea).We found that single-cell transcriptomes were similarly comparable to their mass-culture counterparts in predicting MRO metabolic pathways of *** patterns of the components of the MRO metabolic pathways might be divergent among anaerobic ciliates,even among closely related ***,our findings indicate the existence of group-specific functional relics of electron transport chains(ETCs).Detailed group-specific ETC functional patterns are as follows:full oxidative phosphorylation in Oligohymenophorea and Muranotrichea;only electron-transfer machinery in Armophorea;either of these functional types in Parablepharismea;and ETC functional absence in Litostomatea and *** findings suggest that adaptation of ciliates to anaerobic conditions is group-specific and has occurred multiple *** results also show the potential and the limitations of detecting ciliate MRO proteins using single-cell transcriptomes and improve the understanding of the multiple transitions from mitochondria to MROs within ciliates.

关键词： Anaerobic metabolism Mitochondrion-related organelle Single-cell transcriptome Evolutionary transition

Wettability regulation from superhydrophilic to superhydrophobic via nanosecond laser ablation

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Science China(Technological Sciences) 2024年第6期67卷 1829-1841页

作者： chen Zhi WU zhicheng ZHANG GuoJun LI DongHui HAN FengLin State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha410083China Guangdong Provincial Key Laboratory of Manufacturing Equipment Digitization Guangdong HUST Industrial Technology Research InstituteDongguan523808China China Harzone Industry Corp. Ltd.Wuhan430299China

Metal surfaces play a crucial role in numerous applications,from self-cleaning and anti-icing to anti-fogging and oil-water *** regulation of their wettability is essential to enhance their performance in these *** paper proposes a multi-state regulation method for metal surface wettability,leveraging nanosecond laser *** creating non-uniform microstructures on a metal surface,the contact area between the solid and liquid phases can be increased,resulting in the attainment of superhydrophilic properties(contact angle(CA),ranging from 4.6°to 8.5°).Conversely,the construction of uniform microstructures leads to a decreased solid-liquid contact area,thereby rendering the metal surface hydrophilic(CA=12.2°–53°).Furthermore,through heat treatment on a surface with uniform microstructures,organic matter adsorption can be promoted while simultaneously reducing surface *** process results in the metal surface acquiring hydrophobic properties(CA=92.1°–133.5°),facilitated by the“air cushion effect.”Building on the hydrophobic surface,stearic acid modification can further reduce surface energy,ultimately bestowing the metal surface with superhydrophobic properties(CA=150.1°–152.7°,and sliding angle=3.8°).Performance testing has validated the durability and self-cleaning effectiveness of the fabricated superhydrophobic surface while also highlighting the excellent anti-fog performance of the superhydrophilic *** findings strongly indicate the immense potential of these surfaces in various engineering applications.

关键词： nanosecond laser ablation surface wettability superhydrophobic superhydrophilic

Divergent allocations of nonstructural carbohydrates shape growth response to rainfall reduction in two subtropical plantations

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Forest Ecosystems 2022年第2期9卷 222-233页

作者： Xinwei Guo Shirong Liu Hui Wang zhicheng chen Jinglei Zhang Lin chen Xiuqing Nie Lu Zheng Daoxiong Cai Hongyan Jia Baoliang Niu Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing100091China Experimental Center of Tropical Forestry Chinese Academy of ForestryPingxiang532600China Youyiguan Forest Ecosystem Research Station Pingxiang532600China

Nonstructural carbohydrates(NSC)are indicators of tree carbon balance and play an important role in regulating plant growth and ***,our understanding of the mechanism underlying drought-induced response of NSC reserves remains ***,we conducted a long-term throughfall exclusion(TFE)experiment to investigate the seasonal responses of NSC reserves to manipulative drought in two contrasting tree species(a broadleaved tree Castanopsis hystrix *** a coniferous tree Pinus massoniana Lamb.)of the subtropical *** found that in the dry season,the two tree species differed in their responses of NSC reserves to TFE at either the whole-tree level or by organs,with significantly depleted total NSC reserves in roots in both *** the TFE treatment,there were significant increases in the NSC pools of leaves and branches in ***,which were accompanied by significant decreases in fine root biomass and radial growth without significant changes in canopy photosynthesis;while *** exhibited significant increase in fine root biomass without significant changes in radial *** results suggested that under prolonged water limitation,NSC usage for growth in *** is somewhat impaired,such that the TFE treatment resulted in NSC accumulation in aboveground organs(leaf and branch);whereas *** is capable of efficiently utilizing NSC reserves to maintain its growth under drought *** findings revealed divergent NSC allocations under experimental drought between the two contrasting tree species,which are important for better understanding the differential impacts of climate change on varying forest trees and plantation types in subtropical China.

关键词： Photosynthesis Carbon balance Tree growth Nonstructural carbohydrates Carbon limitation

Efficient removal of natural organo-chromium(Ⅲ)through selfcirculating decomplex and immobilization with nanoscale zerovalent iron

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Nano Research 2024年第1期17卷 364-371页

作者： zhicheng Dong Yunyun Xu Can Wu Jin Chao chen Tian Zhang Lin School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China College of Ecology and Environment Chengdu University of TechnologyChengdu 610059China School of Environment and Energy The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)South China University of TechnologyGuangzhou 510006China

Organo-chromium(III)complex is one of the chromium contaminant species,which would transform to high-toxic Cr(VI)during migrating in the *** natural organo-chromium(III)(NOCr)is difficult to remove by traditional degradation or precipitation methods,due to its high stability and ***,we demonstrated a novel NOCr removing method by transforming it to certain structures similar to Cr-Fe minerals in nature,through a self-circulating decomplex and immobilization mechanism with nano zero-valent iron(nZVI).Taking chromium glycinate(Cr-Gly)as a probe,nZVI showed a high Cr removal efficiency of 99.4%under ambient *** removal process included three stages of adsorption,decomplexation,and ***-Gly was first adsorbed on the surface of nZVI by chemisorption of the oxide ***,the adsorbed Cr-Gly was decomplexed and oxidized to Cr(VI)by·OH and 1O_(2),which were generated from molecular oxygen activated by ***,the released Cr(VI)could be in-situ adsorbed and re-reduced to Cr(III),which was further immobilized in form of Cr-O-Fe *** the Cr-O-Fe complexing structure was similar to that of Cr-Fe minerals(such as chromohercynite)in nature,this work explored a novel and efficient NOCr removing method that was potential to weaken chromium pollution in the environment.

关键词： organo-chromium(III) zero-valent iron adsorption decomplexation Cr immobilization

Hepatocyte-specific deletion of Mettl3 promotes hepatocellular carcinoma in mice

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Genes & Diseases 2024年第1期11卷 57-59页

作者： Chunhong Liu Xinzhi Li zhicheng Yao Xueying Li Zheng chen HIT Center for Life Sciences School of Life Science and TechnologyHarbin Institute of TechnologyHarbinHeilongjiang150001China Department of General Surgery The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong 510530China

Hepatocellular carcinoma(HcC)is a key cause of morbidity and mortality,which is a global health *** the molecular and cellular mechanisms of HcC progression is helpful to find either early markers for diagnosis or nov... 详细信息

关键词： diagnosis mortality carcinoma