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珠江三角洲铊在水稻籽实-根系土间迁移及人体健康风险评价

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现代地质 2024年第2期38卷 509-519页

作者：温日阳侯青叶杨忠芳余涛王佳鑫中国地质大学(北京)地球科学与资源学院北京100083

铊(Tl)是一种典型的剧毒重金属元素,其环境行为及人体健康效应日益得到广泛关注,土壤Tl富集会对土壤环境、农作物生长及人体健康造成严重的危害性。珠江三角洲作为土壤重金属富集的典型区域,当前研究主要聚集于Cu、Cd、Pb和As等元素,而... 详细信息

铊(Tl)是一种典型的剧毒重金属元素,其环境行为及人体健康效应日益得到广泛关注,土壤Tl富集会对土壤环境、农作物生长及人体健康造成严重的危害性。珠江三角洲作为土壤重金属富集的典型区域,当前研究主要聚集于Cu、Cd、Pb和As等元素,而对土壤Tl的地球化学特征及其影响因素、生物富集能力及人体健康效应评价的研究较少。本文以珠江三角洲3种成土母质分布区的243套水稻籽实及其根系土样品为研究对象,揭示了水稻根系土Tl含量、生物富集特征及其影响因素,并采用美国环保署(US EPA)推荐的人体健康风险评价模型对研究区土壤Tl的人体非致癌健康风险进行评价。结果表明:水稻根系土Tl含量显著高于我国和广东省土壤Tl含量背景值,18.1%的水稻根系土Tl含量超过加拿大Tl环境质量标准值及瑞士农业土壤Tl标准值(1×10^(-6))。酸性岩浆岩与第四纪沉积物分布区水稻根系土Tl超标率明显高于陆源碎屑岩。水稻根系土Tl含量表现出与K_(2)O、Al_(2)O_(3)、Pb和Zn含量显著相关。综合分析认为珠江流域硫化物矿床风化剥蚀及开采活动是导致下游平原区土壤Tl等重金属元素富集的主要原因。全区20件水稻籽实Tl含量的平均值为0.35×10^(-3),均远低于德国食品安全规定的Tl可食用标准值,水稻籽实Tl生物富集系数主要与根系土Na_(2)O、Zn和Pb含量显著相关。每个样点的HQ值分级结果显示,研究区68%的儿童有中等健康风险,46%的成人有中等健康风险,儿童健康风险显著高于成人。

关键词：珠江三角洲水稻根系土铊成土母质人体健康风险

湖南株洲土壤-水稻籽实间Cr迁移特征及其影响因素

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现代地质 2024年第3期38卷 775-783页

作者：李思远侯青叶汤奇峰余涛杨忠芳中国地质大学(北京)地球科学与资源学院北京100083 国家地质实验测试中心北京100029 中国地质大学(北京)数理学院北京100083

土壤-植物系统中Cr的生物地球化学行为以及高水平Cr对生态环境的影响一直备受关注。本文以湖南株洲作为研究区,采集了490件表层土壤样品、60套水稻籽实及根系土样品,对土壤与水稻籽实中Cr含量分布特征进行分析,对土壤Cr污染程度进行评价... 详细信息

土壤-植物系统中Cr的生物地球化学行为以及高水平Cr对生态环境的影响一直备受关注。本文以湖南株洲作为研究区,采集了490件表层土壤样品、60套水稻籽实及根系土样品,对土壤与水稻籽实中Cr含量分布特征进行分析,对土壤Cr污染程度进行评价,探讨水稻籽实Cr生物富集系数(BCF)的影响因素,据此构建水稻籽实Cr的BCF预测模型,并对研究区水稻籽实Cr含量进行预测。研究区表层土壤Cr含量范围为48.50~240.60 mg/kg,中位值91.45 mg/kg。与全国和湖南省土壤背景值相比,研究区土壤Cr含量严重超标,主要受成土母质和人为活动影响。水稻籽实Cr含量范围为0.09~0.11 mg/kg,平均值0.10 mg/kg,均未超过限值。水稻籽实Cr生物富集系数主要与水稻根系土的Cu、TFe_(2)O_(3)、SiO_(2)/Al_(2)O_(3)显著相关,受根系土风化程度、铁氧化物和元素间拮抗作用影响。采用多元线性回归分析建立了研究区水稻籽实Cr的BCF预测模型,预测结果可靠。水稻籽实Cr含量预测结果显示研究区水稻籽实Cr含量均低于我国的稻谷Cr含量限值。

关键词：株洲水稻籽实 Cr 影响因素预测模型

女性HIV/AIDS患者自我耻辱感干预策略的系统评价

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中国艾滋病性病 2024年第7期30卷 754-759页

作者：杨中方胡倩倩张林张悦杨红丽龚贝贝付艳芬胡雁复旦大学护理学院上海200032 复旦大学循证护理中心上海200032 上海市重大传染病与生物安全研究院上海200032 纽约大学Rory Meyers护理学院纽约10010 安徽中医药大学护理学院合肥230012 上海市公共卫生临床中心护理部上海201515 云南省传染病医院/云南省艾滋病关爱中心/云南省心理卫生中心护理部昆明650300 南宁市第四人民医院护理部南宁530002 大理大学护理学院云南大理671006

目的对女性HIV/AIDS患者自我耻辱感的干预策略进行系统评价,为相关科室护理干预策略的制定提供循证依据。方法在PubMed、Cochrane library循证医学数据库、Embase (OVID)、ProQuest、Scopus、CINAHL(EBSCO)、中国知网(CNKI)、万方数... 详细信息

目的对女性HIV/AIDS患者自我耻辱感的干预策略进行系统评价,为相关科室护理干预策略的制定提供循证依据。方法在PubMed、Cochrane library循证医学数据库、Embase (OVID)、ProQuest、Scopus、CINAHL(EBSCO)、中国知网(CNKI)、万方数据库、中文科技期刊数据库(VIP)和中国生物医学文献数据库(SinoMed)中检索关于女性HIV/AIDS患者自我耻辱感干预策略的干预性研究。检索时限为自建库至2023年5月。根据纳入和排除标准筛选文献并对纳入文献进行质量评价,对提取结果进行Meta分析或描述性分析。结果 8项干预性研究被纳入分析,共1 432例患者。女性HIV/AIDS患者自我耻辱感的干预层面大多落脚于个体层面,干预类型涉及信息培训干预、技术培训干预及两者结合的干预。5项研究的干预策略对降低女性HIV/AIDS患者自我耻辱感效果显著。结论现有干预策略对降低女性HIV/AIDS患者自我耻辱感的效果有待进一步验证,从机制水平制订干预策略对减少女性HIV/AIDS患者自我耻辱感具有积极意义。

关键词：艾滋病病毒感染者/艾滋病患者传染病女性耻辱感干预性研究

Alkylammonium cations treating and K-Ar dating of illite from mudstones

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Chinese Science Bulletin 2002年第19期47卷 1669-1672页

作者： yang zhongfang JI Junfeng CHE Chen ZHOU Fengying China University of Geosciences Beijing 100083China State Key Laboratory of Mineral Deposit Research Institute of Surfacial GeochemistryDepartment of Earth SciencesNanjing UniversityNanjing 210093China Deposit Institute of Chinese Academy of Geological Sciences Beijing 100037China

Two kinds of mudstones from the Tarim Basin and the Tuna Basin were treated with C8 and C18 alkylammonium cations. Both of them were dated by the K-Ar method. One kind of rock contains mainly diagenetic illite, and the other contains mixed layer illite/smectite (I/S). Sample separation and alkylamnionium cations treatment were performed first, and K-Ar dating followed. The result shows that fine-grained minerals have younger K-Ar ages and coarse-grained components have older ages. Plots of K-Ar age versus K2O (%) are linear, the range of diagenetic age can be estimated by extrapolation. The reaction results of the above samples are different after alkylamnionium cations treatments. The samples containing mainly illite show a decrease in K2O and an increase in age by 1-25 Ma, suggesting that preferential exchange of young diagenetic clay rather than detrital clay by alkylamnionium cations, therefore the age of diagenetic illite can be calculated directly by the % K2O and radiogenic 40Ar removed. For the

关键词： alkylammonium cations illite K/Ar date mudstone.

Seasonal variations in the Sr-Nd isotopic compositions of suspended particulate matter in the lower Changjiang River:Provenance and erosion constraints

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Chinese Science Bulletin 2011年第22期56卷 2371-2378页

作者： MAO ChangPing CHEN Jun YUAN XuYin yang zhongfang JI JunFeng Institute of Surficial Geochemistry School of Earth Sciences and Engineering Nanjing University Nanjing 210093 China College of Environmental Science and Engineering Hohai University Nanjing 210098 China School of Earth Science and Resources China University ofGeosciences (Beijing) Beijing 100083 China

Suspended particulate matter samples were collected monthly for more than 2 years in Nanjing,China to examine seasonal changes in the Sr-Nd isotopic compositions of the lower Changjiang River(CR).The results indicate that the 87Sr/86Sr ratios of the samples ranges from 0.725352 to 0.738128,and the values ofεNd(0)ranges from-10.55 *** Sr-Nd isotopic compositions show distinct seasonal *** samples had lower 87Sr/86Sr ratios and higherε Nd(0)values during the flood season than the dry *** seasonal variations primarily reflect the controls of provenance rocks and erosion in different *** relative decrease in 87Sr/86Sr ratios and the increase inε Nd(0)values during the flood season may reflect an increasing in the mechanical erosion rate in the upper basin and the contribution of more sediment from the upper *** end member values of 87Sr/86Sr andε Nd(0)of the samples were 0.728254 and?11.26,respectively.

关键词：同位素组成悬浮颗粒物季节变化侵蚀率 Sr Nd 长江季节性变化

Ecological risk assessment of Cd and other heavy metals in soil-rice system in the karst areas with high geochemical background of Guangxi,China

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Science China Earth Sciences 2021年第7期64卷 1126-1139页

作者： Qiong yang zhongfang yang Qizuan ZHANG Xu LIU Xiaoxiong ZHUO Tiansheng WU Lei WANG Xueji WEI Junfeng JI School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Guangxi Bureau of Geology&Mineral Prospecting&Exploitation Nanning 530023China Guangxi Institute of Geological Survey Nanning 530023China Geology Team No.4 of Guangxi Zhuang Autonomic Region Nanning 530031China Guangxi Geophysical Investigation Institute Liuzhou 545005China Key Laboratory of Surficial Geochemistry Ministry of EducationSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China

Karst areas are widely distributed in China,and the soil derived in these areas is enriched with trace elements and has the typical characteristics of high geochemical ***,soil ecological risk has gradually attracted extensive *** this study,1090 sets of rice grains and paired rhizosphere soils were collected as research objects from the outcropped karst areas of carbonate rocks in Guangxi,and the concentration characteristics and influencing factors of heavy metals,such as Cd and As,in rice grains and the corresponding soils were *** to the Chinese Soil Environmental Quality Standard(GB 15618-2018),the proportion of karstic soil samples in Guangxi with heavy metal(As,Cd,Cr,Cu,Hg,Ni,Pb and Zn)concentrations that exceed the standard risk screening values was generally greater than that of surface soils in China or non-karstic soils in ***,Cd and As were the most prominently enriched heavy metals in *** to the Chinese Food Safety Standard(GB 2762-2017),Pb in rice grains from the studied area did not exceed the standard;the exceedance rates of Cr,Hg,and inorganic As were only about 1%;and the exceedance rate of Cd was 12.5%.Soil Cd concentration increased gradually whereas the concentration and exceedance rate of Cd in rice grains decreased gradually with the increase of soil ***,the exceedance rate of Cd in rice grains was only 4%when soil pH>*** results indicated that the risk screening values of Cd element in the Chinese Soil Environmental Quality Standard are not satisfactorily applicable to the ecological risk assessment of Cd in karstic ***,the recommended threshold values for the safe utilization and risk control of Cd in karstic soils was proposed so as to provide a basis for soil environmental quality hierarchization,pollution risk control and land safety zoning of agricultural land in karst areas in China.

关键词： Heavy metals Soil Rice grain Ecological risk assessment Karst area in Guangxi High geochemical background

Spatial analysis of land use change effect on soil organic carbon stocks in the eastern regions of China between 1980 and 2000

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Geoscience Frontiers 2017年第3期8卷 597-604页

作者： Xueqi Xia zhongfang yang Yuan Xue Xin Shao Tao Yu Qingye Hou School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China Chongqing Institute of Land Surveying and Planning Chongqing 404000 China

Spatial distributions of 0-20 cm soil carbon sources/sinks caused by land use changes from the year 1980 to 2000 in an area of 2.97 ~ 106 km2 in eastern China were investigated using a land use dataset from a recent soil geochemical survey. A map of soil carbon sourcesJsinks has been prepared based on a spatial analysis scheme with GIg. Spatial statistics showed that land use changes had caused 30.7 ＋ 13.64 Tg of surface soil organic carbon loss, which accounts for 0.33% of the total carbon storage of 9.22 Pg. The net effect of the carbon source was estimated to be ~ 71.49 Tg soil carbon decrease and ~ 40.80 Tg increase. Land use changes in Northeast China （NE） have the largest impact on soil organic carbon storage compared with other regions. Paddy fields, which were mainly transformed into dry farmland in NE, and constructed land in other regions, were the largest carbon sources among the land use types. Swamp land in NE was also another large soil carbon source when it was transformed into dry farmland or paddy fields. Dry farmland in the NE region formed the largest soil organic carbon sink, as some were trans- formed into paddy fields, forested land, and other land use types with high SOCD.

关键词： Land use change Soil organic carbon GIS Eastern China

干旱区土壤无机碳碳汇作用及其对固碳减排贡献研究进展

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中国地质 2024年第4期51卷 1210-1242页

作者：李畅杨忠芳余涛牛荣琛郭茹璨余保成夏学齐于朝阳曹圆圆中国地质大学(北京)地球科学与资源学院北京100083 自然资源部生态地球化学重点实验室北京100037 中国地质大学(北京)数理学院北京100083 中国矿业大学(北京)地球科学与测绘工程学院北京100083 宁夏回族自治区地球物理地球化学调查院宁夏银川750000

【研究目的】干旱区土壤无机碳作为全球碳循环举足轻重的组成部分,其碳汇效应不容忽视。【研究方法】本文查阅了大量国内外干旱区土壤无机碳的相关文献,重点对土壤无机碳汇确认、碳库组成、来源识别,以及碳汇影响因素进行了系统性归纳... 详细信息

【研究目的】干旱区土壤无机碳作为全球碳循环举足轻重的组成部分,其碳汇效应不容忽视。【研究方法】本文查阅了大量国内外干旱区土壤无机碳的相关文献,重点对土壤无机碳汇确认、碳库组成、来源识别,以及碳汇影响因素进行了系统性归纳总结。【研究结果】干旱区无机碳汇效应伴随着干旱区负通量研究得到确认,但其碳库组成十分复杂,包括了液相碳库与固相碳库。其中液相储库主要以可溶性碳酸盐形式赋存于干旱区地下水体;固相储库则为以固相碳酸盐矿物的形式赋存在土壤中,依据不同成因来源分为成岩碳酸盐与成土碳酸盐,后者又细分为碳质成土碳酸盐与硅质成土碳酸盐。成土碳酸盐中的硅质成土碳酸盐具备真正长期稳定的碳汇效应。无机碳汇的影响因素复杂,包括了自然的气候、土壤性质与深度、生物作用、成土母质、土壤有机质等因素,以及土地利用与土地覆盖、农业管理措施等人为因素。【结论】干旱区土壤无机碳对全球碳循环研究极其重要,当前研究主要聚焦在土壤无机碳来源分辨,碳汇效应强度确认与固碳潜力量化,以及影响因素明确与人为干预的可能性评估等方面。在实现“双碳目标”驱动下,查清干旱—半干旱地区土壤无机碳源汇过程与影响因素必将是未来的研究热点,也是解决“碳失汇”科学难题的突破点,极大地推动全球碳循环研究。

关键词：土壤无机碳干旱—半干旱地区碳汇碳库组成来源识别影响因素环境地质调查工程

Solid-solution partitioning of arsenic(As) in the paddy soil profiles in Chengdu Plain,Southwest China

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Geoscience Frontiers 2012年第6期3卷 901-909页

作者： Xiaoyan yang Qingye Hou zhongfang yang Xin Zhang Yijun Hou School of Earth Science and Resources China University of Geosciences(Beijing)Beijing 100083China National Research Center for Geoanalysis Chinese Academy of Geological SciencesBeijing 100037China Information Center Ministry of Land and Resources of the People's Republic of ChinaBeijing 100033China

To predict the long-term behavior of arsenic （As） in soil profiles, the solid-solution partitioning of As was studied in four paddy soil profiles obtained from agricultural areas in Chengdu Plain, Southwest China. Paddy soil profile samples were collected and soil solution samples were extracted. Total As contents in soil solution and soil solid were analyzed, along with the soil solid phase properties. The As in soil solu- tion was significantly higher in the upper layer （0--20 cm） and had a definite tendency to decrease towards 40 cm regardless of the sampling locations. When the concentration of arsenic in soil solution decreased, its content in solid phase increased. Field-based partition coefficient （Kd） for As was determined by calculating the ratio of the amount of As in the soil solid phase to the As concentration in the soil solution. Kj values varied widely in vertical samples and correlated well with soil pH, total organic carbon （TOC） and total As. The results of this study would be useful for evaluating the accumulation trends of hrsenic in soil profiles and in improving the management of the agricultural soils.

关键词： Soil profiles Arsenic (As) Soil solution Partition coefficient (Kd)Geochemistry