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A chronological review of photochemical reactions of ferrioxalate at the molecular level:New insights into an old story

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Chinese Chemical Letters 2023年第5期34卷 38-45页

作者： Xiaodie Li Meiru Hou Yu Fu Lingli Wang Yifan Wang Dagang Lin Qingchao Li Dongdong Hu Zhaohui Wang Shanghai Key Lab for Urban ecological Processes and Eco-restoration School of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China Technology innovation center for Land Spatial Eco-restoration in Metropolitan Area Ministry of Natural ResourcesShanghai 200062China Shanghai Engineering Research center of Biotransformation of Organic Solid Waste Shanghai 200241China

Owing to its outstanding photoactivity,ferrioxalate is originally used as an actinometer and subsequent work has discovered that photochemistry of ferrioxalate is also fundamentally or technically important in atmospheric chemistry and water *** the overall products generated from photolysis of ferrioxalate are known to include Fe(Ⅱ),a series of oxidizing(e.g.,·OH,O_(2)^(·-)/HO_(2)^(·-))or reducing(C_(2)O_(4)^(·-)/CO_(2)^(·-))radicals and H_(2)O_(2),however,at the molecular level,the primary step of the photoreaction of ferrioxalate remains as an unsolved mystery due to the difficulty in examining such ultrafast *** from the development of time-resolved spectroscopy,this old question has been studied with increasing vigor recently,by means of such ever-more-sophisticated techniques(e.g.,flash photolysis,time-resolved X-ray absorption spectroscopy(XAS),femtosecond infrared(IR)absorption spectroscopy,ultrafast photoelectron spectroscopy(PES)).There are two contrary views on the primary reaction mechanism:(1)Intramolecular electron transfer(ET)precedes the cleavage of the metal-ligand bond;(2)The dissociation of C-C or Fe-O bond occurs before intramolecular ***,this review presents a comprehensive summary about the overall reaction mechanism and molecular level mechanism of *** chronological order,we have elaborated two predominant but controversial views from the perspectives of different experimental *** challenges and research opportunities in this active field are also briefly discussed.

关键词： Ferrioxalate Photolysis Ligand-to-metal charge transfer(LMCT) Time-resolved spectroscopy

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Combining rhizosphere and soil-based P management decreases the P fertilizer demand of China by more than half based on LePA model simulations

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Journal of Integrative Agriculture 2023年第8期22卷 2509-2520页

作者： YU Wen-jia LI Hai-gang Peteh MNKEBIWE YANG Xue-yun GUO Da-yong LI Cui-lan ZHU Yi-yong XIAO Jing-xiu LI Guo-hua SUN Zhi Torsten MüLLER SHEN Jian-bo Key Laboratory of Plant–Soil Interactions College of Resources and Environmental Sciences/National Academy of Agriculture Green Development of Ministry of EducationChina Agricultural UniversityBeijing 100193P.R.China Inner Mongolia Key Laboratory of Soil Quality and Nutrient resources/Key Laboratory of Agricultural ecological Security and green development at Universities of Inner Mongolia Autonomous Region Inner Mongolia Agricultural UniversityHohhot 010018P.R.China Department of Fertilization and Soil Matter Dynamics Institute of Crop ScienceUniversity of HohenheimStuttgart 70593Germany Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China College of Natural Resources and EnvironmentNorthwest A&F UniversityYangling 712199P.R.China College of Agronomy Henan University of Science and TechnologyLuoyang 471000P.R.China Department of Agricultural resources and Environment College of Resources and EnvironmentJilin Agricultural UniversityChangchun 130118P.R.China Jiangsu collaborative innovation center for Solid Organic Waste Resource Utilization College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095P.R.China College of resources and Environment Yunnan Agricultural UniversityKunming 650500P.R.China Plant Production Systems Group Wageningen UniversityWageningen 6700Netherlands Israel Chemicals Ltd.(ICL) Tel Aviv 61070Israel

Phosphorus(P)is a finite natural resource and is increasingly considered to be a challenge for global *** in China plays a key role in global sustainable P *** and soil-based P management are necessary for improving P-use efficiency and crop productivity in intensive agriculture in China.A previous study has shown that the future demand for phosphate fertilizer by China estimated by the LePA model(legacy phosphorus assessment model)can be greatly reduced by soil-based P management(the building-up and maintenance approach).The present study used the LePA model to predict the phosphate demand by China through combined rhizosphere and soil-based P management at county scale under four P fertilizer scenarios:(1)same P application rate as in 2012;(2)rate maintained same as 2012 in low-P counties or no P fertilizer applied in high-P counties until targeted soil Olsen-P(TPOlsen)level is reached,and then rate was the same as P-removed at harvest;(3)rate in each county decreased to1–7 kg ha^(-1) yr^(-1) after TPOlsen is reached in low-P counties,then increased by 0.1–9 kg ha^(-1) yr^(-1) until equal to P-removal;(4)rate maintained same as 2012 in low-P counties until TPOlsen is reached and then equaled to P-removal,while the rate in high-P counties is decreased to 1–7 kg ha^(-1) yr^(-1) until TPOlsen is reached and then increased by 0.1–9 kg ha^(-1) yr^(-1)until equal to *** predictions showed that the total demand for P fertilizer by whole China was 693 Mt P2O5and according to scenario 4,P fertilizer could be reduced by 57.5%compared with farmer current practice,during the period 2013–*** model showed that rhizosphere P management led to a further 8.0%decrease in P fertilizer use compared with soil-based P *** average soil Olsen-P level in China only needs to be maintained at 17 mg kg^(-1) to achieve high crop *** results provide a firm basis for government to issue-relevant policies for sustainable

关键词： phosphorus reserves Pmanagement crop agriculture China modelling

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Spatially explicit reconstruction of cropland cover for China over the past millennium

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Science China Earth Sciences 2023年第1期66卷 111-128页

作者： Fanneng HE Fan YANG Caishan ZHAO Shicheng LI Meijiao LI Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Research Institute of Yellow River Civilization and Sustainable development&collaborative innovation center on Yellow River Civilization Jointly Built By Henan Province and Ministry of Education Henan UniversityKaifeng 475001China University of Chinese Academy of Sciences Beijing 100049China School of Public Administration China University of GeosciencesWuhan 430074China College of resources and Environment Shanxi University of Finance and EconomicsTaiyuan 030006China

Reconstructing historical land use and land cover change using explicit temporal,quantitative,and spatial information is not only the prerequisite for simulating long-term climate change and ecological effects but is also a scientific basis for comprehensively understanding the process and mechanism of anthropogenic land use *** changes in historical borders and administrative divisions,a provincial cropland area dataset for China over the past millennium was created on the basis of existing estimations since the Song *** suitability for cultivation was then assessed by incorporating altitude,slope,soil texture,and the maximum potential productivity of ***,a gridding allocation model for cropland was constructed,and the provincial cropland area for 24 years over the past millennium was allocated into grids with a resolution of 10 *** cropland area in China increased from 3.71×10^(7)ha in AD 1000 to 12.92×10^(7)ha in AD 1999,with a peak of 13.50×10^(7)ha in AD *** total cropland area in China showed fluctuating increasing trends that can be divided into three phases:fluctuation without notable net change for AD 1000–1290,slow increase for AD 1290–1661,and rapid increase for AD 1661–***,cropland intensified in the middle-lower reaches of the Yellow and Yangtze Rivers and expanded to mountainous and frontier areas over the last ***,over the entire period,the fractional cropland areas(FCAs)in the middle-lower reaches of the Yellow and Yangtze Rivers increased by 1.4 and 0.8 times,*** the mid-Qing Dynasty,large-scale land reclamation expanded to areas of low reclamation in southwest and northeast *** FCAs for southwest and northeast China increased from 2.13%and 0.55%in AD 1661 to 18.00%and 26.61%in AD 1999,*** AD 1661–1999,the proportion of cropland increased by 55%in the hills and low mountains and 27%in the middle and high *** comparison wit

关键词： Land use and land cover change Historical cropland Gridding reconstruction China Last millennium

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From trash to treasure: Chemical recycling and upcycling of commodity plastic waste to fuels, high-valued chemicals and advanced materials

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Journal of Energy Chemistry 2022年第6期31卷 369-388,I0011页

作者： Fan Zhang Fang Wang Xiangyue Wei Yang Yang Shimei Xu Dehui Deng Yu-Zhong Wang The collaborative innovation center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064SichuanChina College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610064SichuanChina State Key Laboratory of Catalysis Collaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Of all the existing materials, plastics are no doubt among the most versatile ones. However, the extreme increases in plastic production as well as the difficulty of the material for degradation have led to a huge number of plastic wastes. Their recycling rate after disposal is less than 10%, resulting in a series of serious environmental and ecological problems as well as a significant waste of resources. Current recycling methods generally suffer from large energy consumption, the low utilization rate of recycled products with low added value, and produce other waste during the process. Here, we summarized recentlydeveloped chemical recycling ways on commodity plastics, especially new catalytic paths in production of fuels, high-valued chemicals and advanced materials from a single virgin or a mixture of plastic waste,which have emerged as promising ways to valorize waste plastics more economically and environmentally friendly. The new catalyst design criteria as well as innovative catalytic paths and technologies for plastic upcycling are highlighted. Beyond energy recovery by incineration, these approaches demonstrate how waste plastics can be a viable feedstock for energy use with the generation of clean H_(2), high-quality liquid fuels and materials for energy storage, and help inspiring more catalytic process on plastic upcycling to overcome the economical hurdle and building a circular plastic economy.

关键词： Chemical recycling Upcycling Commodity plastic Sustainable development Catalytic path

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Seepage simulation of high concrete-faced rockfill dams based on generalized equivalent continuum model

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Water Science and Engineering 2018年第3期11卷 250-257页

作者： Shou-kai Chen Qi-dong He Ji-gang Cao School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou 450045China Henan Key Laboratory of Water Environment Simulation and Treatment North China University of Water Resources and Electric PowerZhengzhou 450045China Academician Workstation of Water Environment Governance and ecological restoration Zhengzhou 450002China collaborative innovation center of Water resources Efficient Utilization and Protection Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China

This research focused on the three-dimensional(3 D) seepage field simulation of a high concrete-faced rockfill dam(CFRD) under complex hydraulic conditions. A generalized equivalent continuum model of fractured rock mass was used for equivalent continuous seepage field analysis based on the improved node virtual flow method. Using a high CFRD as an example, the generalized equivalent continuum range was determined, and a finite element model was established based on the terrain and geological conditions, as well as structural face characteristics of the dam area. The equivalent seepage coefficients of different material zones or positions in the dam foundation were calculated with the Snow model or inverse analysis. Then, the 3 D seepage field in the dam area was calculated under the normal water storage conditions, and the corresponding water head distribution, seepage flow, seepage gradient, and seepage characteristics in the dam area were analyzed. The results show that the generalized equivalent continuum model can effectively simulate overall seepage patterns of the CFRD under complex hydraulic conditions and provide a reference for seepage analysis of similar CFRDs.

关键词： Concrete-faced rockfill dam(CFRD) Generalized equivalent continuum model Node virtual flow method Fractured rock mass Seepage field Seepage coefficient

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The chloroplast genome comparative characteristic of artificial breeding tree,a case about Broussonetia kazinoki×Broussonetia papyrifera

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BIOCELL 2022年第3期46卷 803-819页

作者： WAN ZHANG GUIYAN YANG YUNLIN ZHAO ZHENGGANG XU HUANG HUIMIN JIAKANG ZHOU Hunan Research center of Engineering Technology for Utilization of Environmental and resources Plant Central South University of Forestry and TechnologyChangsha410004China Hunan Urban and Rural ecological Planning and restoration Engineering Research center Hunan City UniversityYiyang413000China Key Laboratory of National Forestry and Grassland Administration on Management of Western Forest Bio-Disaster College of ForestryNorthwest A&F UniversityYangling712100China

Broussonetia kazinoki×Broussonetia papyrifera(ZJGS)is a hybrid species in Moraceae family,which has a very complicated hybrid *** excellent characteristics of fast growth,strong soil and water conservation ability,high leaf protein content and stem fiber content in ZJGS make it both ecological benefits in the mining area and economically *** study aims to further understand ZJGS and other Moraceae taxa through the ZJGS chloroplast(cp)genome structure and the comparison with 12 closely related Moraceae *** the 13 Moraceae species,the cp genome length of seven Broussonetia species(ranges from 160,239 bp to 162,594 bp)is larger than that of six Morus species(ranges from 158,459 bp to 159,265 bp).Among the 77 shared protein-coding genes(PCGs)in Moraceae species,the obvious positive selection of Ka/Ks ratios acted on petD and rpl16 genes of *** and ***,*** analysis based on shared PCGs from 28 species shows that ZJGS is closely related to maternal *** findings provide data support for the origin of ZJGS hybridization and provide genomic resources for future ZJGS resource development and molecular breeding.

关键词： Broussonetia kazinoki Broussonetia papyrifera Moraceae Phylogenetic relationship Maternal inheritance

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Recycled Aggregate Pervious Concrete: Analysis of Influence of Water-Cement Ratio and Fly Ash under Single Action and Optimal Design of Mix Proportion

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Journal of Renewable Materials 2022年第3期10卷 799-819页

作者： Shoukai Chen Chunpeng Xing Mengdie Zhao Junfeng Zhang Lunyan Wang Qidong He School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou450045China College of Water resources North China University of Water Resources and Electric PowerZhengzhou450045China College of Architecture North China University of Water Resources and Electric PowerZhengzhou450045China Key Laboratory of Water Environment Simulation and Treatment of Henan Province Zhengzhou450002China collaborative innovation center of Water resources Efficient Utilization and Protection Engineering Zhengzhou450045China Water Conservancy and Electric Power Building Survey Design and Research Institute of ChongqingChongqing401120China

Pervious concrete is recommended,which is of great benefit to the ecological environment and human living *** this paper,the influences of five water-cement ratios and four fly ash contents to replace the cement by mass with a water-cement ratio of 0.30 on the properties of Recycled Aggregate Pervious Concrete(RAPC)were *** this,based on the Grey relational-Technique for Order Preference by Similarity to an Ideal Solution(TOPSIS)optimization method,the strength,permeability,abrasion loss rate,and material costs of RAPC were adopted as evaluation indices to establish a mix proportion optimization *** results show that the increase of water-cement ratio and fly ash replacement level of RAPC leads to decreased compres-sive strength while an increase in the permeability and abrasion loss *** to test results based on the optimal model 0.30 was identified as the best mix *** addition,ecological-economic analysis of RAPC raw materials was carried out by comparing different natural *** results of EE(embodied energy)and ECO 2e(embodied CO_(2) emission)pointed out that the combination of recycled aggregate and fly ash leads to sig-nificant ecological and economic benefits.

关键词： Recycled aggregate pervious concrete(RAPC) fly ash optimal model strength and permeability ecological and economic benefits

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How does ecological civilization construction affect carbon emission intensity?Evidence from Chinese provinces’panel data

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Chinese Journal of Population,resources and Environment 2020年第2期18卷 97-102页

作者： Kai Liu Yameng Tao Yi Wu Chengxin Wang School of Geography and Environment/collaborative innovation center of Human-Nature and green development in Universities of Shandong Shandong Normal UniversityJinan250014China

ecological civilization construction is a new concept and trend in the era of China's high-quality *** requires the collaborative propulsion of an ecological economic civilization,ecological social civilization,and ecological environment *** carbon emission intensity is an important issue facing the Chinese government in the backdrop of global ***,studying the influence of ecological civilization construction on carbon emission intensity from different perspectives has important theoretical and practical *** this study,the influences of the three subsystems of an ecological civilization on carbon emission intensity are empirically analyzed using Chinese provincial panel data from 2004 to 2016 and a spatial Durbin model based on the STIRPAT ***,the Moran's I of carbon emission intensity in Chinese provinces was between 0.425 and *** indicates positive spatial correlation and illustrates that the carbon emission intensity of China's provinces can influence each *** reasons behind this correlation include close ties between neighboring provinces and similarities in natural,economic,and social ***,the correlation coefficients of ecological economic civilization,ecological social civilization,and ecological environment civilization to carbon emission intensity are−4.743139,2.865884,and−0.3246447,*** illustrates that an ecological economic civilization and ecological environment civilization can reduce carbon emission intensity,while an ecological social civilization can increase *** reduce total carbon emission intensity,the three subsystems of ecological civilization should have a negative relationship with carbon emission intensity,so the effect of ecological social civilization on carbon emission intensity should be ***,the spatial spillover effect of ecological social civilization did not pass the significance *** correlation coefficients of spatia

关键词： ecological civilization Carbon emission green development Spatial Durbin model

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Automatic segmentation algorithm for high-spatial-resolution remote sensing images based on self-learning super-pixel convolutional network

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International Journal of Digital Earth 2022年第1期15卷 1101-1124页

作者： Zenan Yang Haipeng Niu Liang Huang Xiaoxuan Wang Liangxin Fan Dongyang Xiao School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuoHenanPeople’s Republic of China Research Centre of Arable Land Protection and Urban-rural High-quality development of of Yellow River Basin HenanPeople’s Republic of China Faculty of Land resources Engineering Kunming University of Science and TechnologyKunmingPeople’s Republic of China Surveying and Mapping Geo-Informatics Technology Research center on Plateau Mountains of Yunnan Higher Education KunmingPeople’s Republic of China Key Laboratory of Spatio-temporal Information and ecological restoration of Mines of Natural resources of the People's Republic of China Henan Polytechnic UniversityJiaozuoPeople’s Republic of China

Super-pixel algorithms based on convolutional neural networks with fuzzy C-means clustering are widely used for high-spatial-resolution remote sensing images ***,this model requires the number of clusters to be set manually,resulting in a low automation degree due to the complexity of the iterative clustering *** address this problem,a segmentation method based on a self-learning super-pixel network(SLSP-Net)and modified automatic fuzzy clustering(MAFC)is ***-Net performs feature extraction,non-iterative clustering,and gradient reconstruction.A lightweight feature embedder is adopted for feature extraction,thus expanding the receiving range and generating multi-scale *** matching is used for non-iterative clustering,and the overfitting of the network model is overcome by adaptively adjusting the gradient weight parameters,providing a better irregular super-pixel neighborhood *** optimized density peak algorithm is adopted for *** on the obtained super-pixel image,this maximizes the robust decision-making interval,which enhances the automation of regional ***,prior entropy fuzzy C-means clustering is applied to optimize the robust decision-making and obtain the final segmentation *** results show that the proposed model offers reduced experimental complexity and achieves good performance,realizing not only automatic image segmentation,but also good segmentation results.

关键词： Deep convolution neural network model super-pixel algorithm automatic fuzzy clustering prior entropy fuzzy C-Means clustering algorithm remote sensing images

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Contribution of Mass Elevation Effect to the Altitudinal Distribution of Global Treelines

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Journal of Mountain Science 2015年第2期12卷 289-297页

作者： ZHAO Fang ZHANG Bai-ping ZHANG Shuo QI Wen-wen HE Wen-hui WANG Jing YAO Yong-hui State Key Laboratory of Resource and Environment Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences Jiangsu center for collaborative innovation in Geographical Information Resource development and Application

Alpine treeline, as a prominent ecological boundary between forested mountain slopes and alpine meadow/shrub, is highly complex in altitudinal distribution and sensitive to warming climate. Great efforts have been made to explore their distribution patterns and ecological mechanisms that determine these patterns for more than 100 years, and quite a number of geographical and ecophysiological models have been developed to correlate treeline altitude with latitude or a latitude related temperature. However,on a global scale, all of these models have great difficulties to accurately predict treeline elevation due to the extreme diversity of treeline site *** of the major reasons is that "mass elevation effect"(MEE) has not been quantified globally and related with global treeline elevations although it has been observed and its effect on treeline elevations in the Eurasian continent and Northern Hemisphere recognized. In this study, we collected and compiled a total of 594 treeline sites all over the world from literatures, and explored how MEE affects globaltreeline elevation by developing a ternary linear regression model with intra-mountain base elevation(IMBE, as a proxy of MEE), latitude and continentality as independent variables. The results indicated that IMBE, latitude and continentality together could explain 92% of global treeline elevation variability, and that IMBE contributes the most(52.2%), latitude the second(40%) and continentality the least(7.8%) to the altitudinal distribution of global treelines. In the Northern Hemisphere, the three factors' contributions amount to 50.4%, 45.9% and 3.7% respectively; in the south hemisphere, their contributions are 38.3%, 53%, and 8.7%, respectively. This indicates that MEE, virtually the heating effect of macro-landforms, is actually the most significant factor for the altitudinal distribution of treelines across the globe, and that latitude is relatively more significant for treeline elevation in the

关键词：海拔分布质量效应线性回归模型高山草甸生态机制气候变暖分布格局生态模型

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