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science china Earth sciences 2024年第6期67卷 1932-1951页

作者： Yu LI Zhansen ZHANG Xueru ZHOU Minjun GAO Junjie DUAN Yaxin XUE Hao sHANG shiyu LIU key laboratory of western china’s environmental systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China

The northern Tibetan Plateau is a climatically sensitive zone influenced by monsoon and westerly *** summer,water vapor transport can reach Qinghai Lake and the eastern section of the Qilian Mountains;in winter,westerly winds mainly control the *** article compares the wet/dry changes in the region during the mid-Holocene(MH)warm period,the medieval climate anomaly(MCA),the current warm period(CWP),and the future warm period from the perspective of *** found that the MH warm period was mainly affected by the orbit-controlled East Asian summer monsoon,and the region showed warm and humid climate *** MCA was mainly controlled by solar radiation,and there was a warm and dry *** CWP and the future warm period are mainly controlled by the rise in temperature caused by the increase in greenhouse gases,and the climate is becoming more *** wet/dry patterns in the CWP and the future warm period in the next century on the northern Tibetan Plateau are similar to those in the *** warming will lead to the expansion of the westerly belt and a gradually humid *** future wet/dry changes will be more similar to the MH warm period.

关键词： Northern Tibetan Plateau Wet/dry change Warm period similarity Driving mechanism Future assessment

Global precipitation change during the Holocene:a combination of records and simulations

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Frontiers of Earth science 2024年第1期18卷 112-126页

作者： Wangting YE Yu LI key laboratory of western china᾽s environmental systems(Ministry of Education) College of Earth and Environmental SciencesCenter for Hydrologic Cycle and Water Resources in Arid RegionLanzhou UniversityLanzhou 730000China

Precipitation can shape our climate both in the present and the *** though we have made significant advances in studying the mechanisms of millennial-scale climate changes through high-resolution records,we still cannot quantitatively characterize the global spatiotemporal precipitation variations within the ***,we developed a new approach to integrating data from 349 globally distributed records and climate models to reconstruct regional and global precipitation patterns over the last 12000 *** results reveal that precipitation reconstructions can be divided into monsoon-driven and westerly driven *** results suggest that an arid climate was experienced in the late glacial and early Holocene epoch(~12−7.4 cal ka BP),attaining a middle Holocene optimum(~7.4−3.5 cal ka BP),and drier after the middle *** to our reconstructions,the global precipitation reconstruction increased from the early Holocene until 3.8 cal ka BP and then subsequently *** addition,our reconstructions better reproduce the low-frequency events and extreme precipitation at the millennial scale in the hemispheres,but the performance of the reconstructions in the equatorial Pacific and the southern Hemisphere of Africa and the Americas is *** resolution of the record and the simulation capability of the climate model remain important means to improve our understanding of past climate change.

关键词： Holocene equatorial glacial

Land use and cover change and influencing factor analysis in the shiyang River Basin,china

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Journal of Arid Land 2024年第2期16卷 246-265页

作者： ZHAO Yaxuan CAO Bo sHA Linwei CHENG Jinquan ZHAO Xuanru GUAN Weijin PAN Baotian key laboratory of western china's environmental systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730030China shiyang River Basin scientific Observing station Lanzhou UniversityLanzhou 730030China

Land use and cover change(LUCC)is the most direct manifestation of the interaction between anthropological activities and the natural environment on Earth's surface,with significant impacts on the environment and social *** economic development and climate change have resulted in significant changes in land use and *** shiyang River Basin,located in the eastern part of the Hexi Corridor in china,has undergone significant climate change and LUCC over the past few *** this study,we used the random forest classification to obtain the land use and cover datasets of the shiyang River Basin in 1991,1995,2000,2005,2010,2015,and 2020 based on Landsat *** validated the land use and cover data in 2015 from the random forest classification results(this study),the high-resolution dataset of annual global land cover from 2000 to 2015(AGLC-2000-2015),the global 30 m land cover classification with a fine classification system(GLC_FCs30),and the first Landsat-derived annual china Land Cover Dataset(CLCD)against ground-truth classification results to evaluate the accuracy of the classification results in this ***,we explored and compared the spatiotemporal patterns of LUCC in the upper,middle,and lower reaches of the shiyang River Basin over the past 30 years,and employed the random forest importance ranking method to analyze the influencing factors of LUCC based on natural(evapotranspiration,precipitation,temperature,and surface soil moisture)and anthropogenic(nighttime light,gross domestic product(GDP),and population)*** results indicated that the random forest classification results for land use and cover in the shiyang River Basin in 2015 outperformed the AGLC-2000-2015,GLC_FCs30,and CLCD datasets in both overall and partial ***,the classification results in this study exhibited a high level of agreement with the ground truth *** 1991 to 2020,the area of bare land exhibited a decreasing trend,with chan

关键词： land use and cover classification land use and cover change(LUCC) climate change random forest accuracy assessment three-dimensional sampling method shiyang River Basin

Finer topographic data improves distribution modeling of Picea crassifolia in the northern Qilian Mountains

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Journal of Mountain science 2024年第10期21卷 3306-3317页

作者： ZHANG Xiang GAO Linlin LUO Yu YUAN Yiyun MA Baolong DENG Yang MOE key laboratory of western china's environmental systems College of Earth Environmental SciencesLanzhou UniversityLanzhou 730000China Academy of Plateau science and sustainability Qinghai Normal UniversityXining 810008China

The Qilian Mountains, a national key ecological function zone in western china, play a pivotal role in ecosystem services. However, the distribution of its dominant tree species, Picea crassifolia (Qinghai spruce), has decreased dramatically in the past decades due to climate change and human activity, which may have influenced its ecological functions. To restore its ecological functions, reasonable reforestation is the key measure. Many previous efforts have predicted the potential distribution of Picea crassifolia, which provides guidance on regional reforestation policy. However, all of them were performed at low spatial resolution, thus ignoring the natural characteristics of the patchy distribution of Picea crassifolia. Here, we modeled the distribution of Picea crassifolia with species distribution models at high spatial resolutions. For many models, the area under the receiver operating characteristic curve (AUC) is larger than 0.9, suggesting their excellent precision. The AUC of models at 30 m is higher than that of models at 90 m, and the current potential distribution of Picea crassifolia is more closely aligned with its actual distribution at 30 m, demonstrating that finer data resolution improves model performance. Besides, for models at 90 m resolution, annual precipitation (Bio12) played the paramount influence on the distribution of Picea crassifolia, while the aspect became the most important one at 30 m, indicating the crucial role of finer topographic data in modeling species with patchy distribution. The current distribution of Picea crassifolia was concentrated in the northern and central parts of the study area, and this pattern will be maintained under future scenarios, although some habitat loss in the central parts and gain in the eastern regions is expected owing to increasing temperatures and precipitation. Our findings can guide protective and restoration strategies for the Qilian Mountains, which would benefit regional ecological balanc

关键词： species distribution modeling Picea crassifolia High resolution topographic data Climate change Qilian Mountains Nature Reserve Climate scenarios

source apportionment and suitability evaluation of seasonal VOCs contaminants in the soil around a typical refining-chemical integration park in china

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Journal of environmental sciences 2024年第3期137卷 651-663页

作者： Xu Zhao Jing Meng Qianqian Li Guijin su Qifan Zhang Bin shi Lingwen Dai Yong Yu key laboratory of environmental Nanotechnology and Health Effects State Key Laboratory of Environmental Chemistry and EcotoxicologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of sciences Beijing 100049China state environmental Protection key laboratory of Quality Control in environmental Monitoring China National Environmental Monitoring CenterBeijing 100012China

Accurate source apportionment of volatile organic compounds(VOCs)in soil nearby petrochemical industries prevailing globally,is critical for preventing ***,in the process,seasonal effect on contamination pathways and accumulation of soil VOCs is often ***,Yanshan Refining-Chemical Integration Park,including a carpet,refining,synthetic rubber,and two synthetic resin zones,was selected for *** variations resulted in a gradual decrease of 31 VOCs in soil from winter to summer.A method of dry deposition resistance model coupling partitioning coefficient model was created,revealing that dry deposition by gas phase was the primary pathway for VOCs to enter soil in winter and spring,with 100 times higher fux than by particle *** profiles for five zones were built by gas sampling with distinct substance indicators screened,which were used for positive matrix factorization factors *** of the five zones were 14.9%,20.8%,13.6%,22.1%,and 28.6%in winter and 33.4%,12.5%,10.7%,24.9%,and 18.5%in spring,*** variation in the soil sorption capacity of VOCs causes inter-seasonal differences in *** better correlation between dry deposition capacity and soil storage of VOCs made root mean square and mean absolute errors decrease averagely by 8.8%and 5.5%in winter compared to *** study provides new perspectives and methods for the source apportionment of soil VOCs contamination in industrial sites.

关键词： Dry deposition resistance model Positive matrix factorization model Partitioning coefficient model Contamination pathway source profile

Climatic implications in earlywood and latewood width indices of Chinese pine in north central china

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Journal of Forestry Research 2024年第3期35卷 143-153页

作者： Kaixuan Yang Junzhou Zhang Haowen Fan Yuan Yan College of Geographic sciences Qinghai Normal UniversityXining 810016People's Republic of China key laboratory of Tibetan Plateau Land surface Processes and Ecological Conservation(Ministry of Education) Xining 810016People's Republic of China key laboratory of western china's environmental systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730030People's Republic of China Gansu Liancheng Forest Ecosystem Field Observation and Research station Lanzhou UniversityLanzhou 730333People's Republic of China school of Geography and Information Engineering University of GeoscienceWuhan 430074People's Republic of China

Latewood width(LWW)indices of trees are considered a reliable proxy of summer precipitation in the Northern ***,the strong coupling and high correlation between earlywood width(EWW)and LWW indices often prevent registration of climate signals of the LWW *** this study,328-year-long earlywood width and latewood width chronologies were developed from Chinese pine at two sites in the Hasi Mountains,north central *** climate responses of these chronologies were analyzed and the LWW index used to derive sum-mer precipitation *** analyses showed that LWW was particularly influenced by earlywood growth and recorded stronger climate signals of the previous year as EWW,rather than those of the current year with infrequent summer climate ***,after removing the effect of earlywood growth using a simple regression model,the adjusted LWW chronology(LWW_(adj))showed a strong relationship with July precipitation in dry *** suggests that the LWW_(adj) chronology has the potential to be used to investigate long-term variability in summer precipitation in drought-limited regions.

关键词： Dendroclimatology Latewood width Climate response summer precipitation Earlywood effect

Applicability of different indices for delineating the boundary of arid region: A case study in northwestern china

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Journal of Earth science 2024年

作者： Xue Peng Xiang Li Yingyibing shen Xuehua Che shipei Dong Zhuolun Li key laboratory of western china's environmental systems (Ministry of Education)， College of Earth and environmental sciences， Center for Glacier and Desert Research， Lanzhou University

Arid regions are vital components of Earth's land surface. Clarifying the area/boundary of arid region is crucial for comprehending area changes and potential mechanisms. However， the accuracy and applicability of arid region boundary delineated by different indices remain unclear. In this study， the annual precipitation （AP）， humidity index （H）， and aridity index （K） were calculated for delineating arid region of china using 106 meteorological stations during 1990–2019. The results suggest that AP and H can accurately delineate arid region， because they are consistent with the distribution of typical soil and vegetation in arid region， whereas K is not. Moreover， AP is the best index for delineating arid region in regions with limited meteorological data， especially in studying long-term patterns and mechanisms of area changes. The accuracy of delineating arid region using H is enhanced in regions with abundant meteorological data. Over the past 30 years， influenced by the increase of atmospheric moisture influx and precipitation， the area in arid region of northwestern china decreased by 70×103–90×103km2， resulting in the present area of approximately 1.55×106km2. This study provides appropriate indices for delineating arid region， contributing to improving our knowledge of regional responses difference to climate change.

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strategies of selective electroreduction of aqueous nitrate to N_(2) in chloride-free system:A critical review

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Green Energy & Environment 2024年第2期9卷 198-216页

作者： Fukuan Li Weizhe Zhang Peng Zhang Ao Gong Kexun Li College of environmental science and Engineering Nankai UniversityTianjin300350China MOE key laboratory of Pollution Processes and environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution ControlTianjin Key Laboratory of Environmental Technology for Complex Trans-Media PollutionNankai UniversityTianjin300350China

Electroreduction of nitrate has been gaining wide attention in recent years owing to it's beneficial for converting nitrate into benign N_(2) from the perspective of electrocatalytic denitrification or into value-added ammonia from the perspective of electrocatalytic NH_(3) *** reason of the undesired formation of ammonia is dominant during electroreduction of nitrate-containing wastewater,chloride has been widely used to improve N_(2) ***,selective electroreduction of nitrate to N2 gas in chloride-containing system poses several *** this review,we focus on the key strategies for efficiently enhancing N_(2) selectivity of electroreduction of nitrate in chloride-free system,including optimal selection of elements,combining an active metal catalyst with another metal,manipulating the crystalline morphology and facet orientation,constructing core–shell structure catalysts,*** summarizing the strategies,four possible reaction pathways of electro-reduction of nitrate to N_(2) are ***,this review attempts to provide practical strategies for enhancing N2 selectivity without the aid of electrochlorination and highlight directions for future research for designing appropriate electrocatalyst for final electrocatalytic denitrifi-cation.

关键词： Nitrate Chloride Electroreduction selectivity Nitrogen

Response of global agricultural productivity anomalies to drought stress in irrigated and rainfed agriculture

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science china Earth sciences 2024年第11期67卷 3579-3593页

作者： Xinxin CHEN Lunche WANG Qian CAO Jia sUN Zigeng NIU Liu YANG Weixia JIANG Hubei key laboratory of Regional Ecology and environmental Change School of Geography and Information EngineeringChina University of Geosciences state key laboratory of Biogeology and environmental Geology China University of Geosciences

The response of agricultural productivity anomalies to drought stress plays a crucial role in the carbon cycle within terrestrial ecosystems and in ensuring food security. However, detailed analysis of how global agricultural productivity anomalies response to drought stress, particularly within irrigated and rainfed agricultural systems, remains insufficient. In this study, the impact of drought stress on agricultural productivity anomalies during the growing season（zcNDVIs）, across both irrigated and rainfed agriculture, were analyzed using a suite of hydro-climatic variables. specifically, the investigation utilized the multi-scalar standardized Precipitation Evapotranspiration Index（sPEI）, the Multivariate ENsO Index（MEI）, and the Madden-Julian Oscillation（MJO）. Meanwhile, the relationships between hydroclimatic variables and zcNDVIswere analyzed at one, two, three and four months before the ending of growing season（EOs）. Results showed that（1） the percentages of significant（ps varied across the globe from 8.30% to 13.42%, 6.50% to 14.63%, 6.52% to 14.23%, and 6.47%to 14.95% at one-, two-, three-, and four-month lead times before EOs, respectively, during 2001–2020, which represented by the multiscalar sPEI. This observation highlights that most regions across the globe tend to be arid, which could significantly impact agricultural productivity;（2） the global mean correlation coefficients（rmax） for sPEI-1, sPEI-3, sPEI-6, sPEI-12（indicating sPEI at 1-, 3-, 6-, and 12-month lags）, MEI, and MJO with zcNDVIsranged between 0.24–0.25, 0.27–0.28, 0.25–0.26, 0.21–0.22, –0.02–0.01 and 0.06–0.11, respectively, across both irrigated and rainfed agriculture system from 2001 to *** productivity anomalies demonstrated a significant correlation with drought stress. The strongest correlations were noted for sPEI-3 and sPEI-6, suggesting a delayed response of crops to drought conditions. This indicates that agriculture ecosystem experiences prolo

关键词： Drought Agricultural productivity anomaly Remote sensing MEI and MJO

Tailoring the surface and interface structures of photocatalysts to enhance hydrogen production

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science china Chemistry 2024年第4期67卷 1161-1174页

作者： Tao Zhang Pengfei Wang shuai Yue Fei Li Zhiyong Zhao sihui Zhan MOE key laboratory of Pollution Processes and environmental Criteria/Tianjin key laboratory of environmental Remediation and Pollution Control College of Environmental Science and EngineeringNankai UniversityTianjin 300350China

Photocatalytic water splitting using semiconductor photocatalysts is a promising approach for the production of carbon-neutral,sustainable and clean hydrogen ***,the separation and transport of photoinduced carriers are generally considered to be rate-limiting steps,and their low efficiency remains a major ***,much effort has been devoted to developing new strategies in surface/interface engineering of photocatalysts to improve the dynamics of charge separation/*** feature article briefly summarizes recent advances in photocatalyst surface/interface engineering by our research group,which have been achieved through the design of various novel photocatalysts,including interfacial modulation,heterostructure construction,heteroatom doping,single atom and diatom *** article is divided into three parts:first,we briefly introduce the three key processes involved in solar water splitting and reveal relationships between the properties of nanostructural photocatalysts and the fundamentals of water splitting;second,we detail methods and strategies for surface and interfacial structures to improve the efficiency of the fundamental processes,especially charge separation;finally,we explore prospects for photocatalytic water splitting *** article provides a valuable resource and strategies for researchers currently working in the field of photocatalytic water splitting.

关键词： photocatalytic water splitting surface/interface structures dual-functional photocatalysis