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| 1 | 伊洛瓦底江三角洲土地利用时空变化分析显示文摘研究土地利用变化对土地资源的生态安全和可持续利用具有重要意义。利用1990—2020年4期的土地利用遥感影像数据,基于土地利用动态度、土地利用程度及土地利用转移矩阵等指标,对伊洛瓦底江三角洲的土地利用时空变化情况进行了分析。结果表明:伊洛瓦底江三角洲1990—2020年30年间整体的土地利用变化速度较平缓,各用地类型的土地利用变化率在不同时段存在很大差异,各时期的土地利用率均超过了97%,综合土地利用程度呈先上升后下降的趋势,不同土地利用类型之间存在显著的相互转化过程。研究成果可为伊洛瓦底江三角洲土地资源规划和农业生产布局优化提供依据。 | 童晓霞 刘翔 胡波 | 2022 | 长江技术经济2022，6，5： | 0 |
| 2 | Heavy metal gradients from rural to urban lakes in central China显示文摘Background:Limited information is available on heavy metal patterns in lakes under rapid watershed urbanization,especially considering a large spatial gradient with a long linear distance and great variations in topographic relief.To fill this gap,we studied concentrations of a series of heavy metals in both water and sediments from 20 lakes along a rural to urban gradient in central China,and we aimed to understand the effects of urban processes on heavy metal dynamics in lake ecosystems.Studied lakes were divided into five groups:A(rural reservoir group),B(rural commercial fishing group),C(urban park group),D(urban recreational fishing group),and E(urban commercial fishing group).An inductively coupled plasma optical emission spectrometer(ICP-OES)and an inductively coupled plasma-mass spectrometer(ICP-MS)were used to analyze the heavy metals in water and sediments.Results:An increasing trend of most heavy metals in water from rural to urban lakes was observed.Concentrations of cadmium(Cd),cobalt(Co),lead(Pb),chromium(Cr),arsenic(As),nickel(Ni),magnesium(Mn),iron(Fe),and aluminum(Al)in water were significantly lower in rural group A than those in other groups.Arsenic in sediments of rural group A was lower than those in other groups.No other heavy metal element in sediments was significantly different among groups.The enrichment factor analysis of selected heavy metals showed there were different degrees of enrichments of heavy metals in sediments.The potential ecological risk index showed a low level for heavy metals in sediments of all studied lakes.Conclusions:Results indicated that urban processes could have an impact on heavy metals in lake water.The sources of heavy metals in sediments were more likely from anthropogenic activities.These results could enhance our understanding of metal dynamics in lake ecosystems under urbanization and could help prevent heavy metal pollutions and promote sustainable management of urban ecosystems. | Wentong Xia Rui Wang Bin Zhu Lars G.Rudstam Yinglong Liu Yanxue Xu Wei Xin Yushun Chen | 2020 | Ecological Processes2020，9，1： | 0 |
| 3 | Geochemical elements in suspended particulate matter of Ensenada de La Paz Lagoon,Baja California Peninsula,Mexico:Sources,distribution,mass balance and ecotoxicological risks显示文摘The present study aimed to evaluate multi-element concentrations(Al,As,Ca,Cd,Co,Cr,Cu,Fe,Mg,Mn,Mo,Ni,Pb,Sr)in suspended particulate material(SPM)collected from Ensenada de La Paz(ELP)lagoon,Baja California Sur,Mexico in two different periods(September and May)to comprehend their origin,geochemical behavior,mass transfer and associated ecotoxicological risks.The 24 hr variation coefficient of volumetric SPM levels were found to be 51.7%in September and 40.5%in May,signifying the effects of oceanic waters.The calculated enrichment factor(EF)values for all the studied elements were of higher magnitude because of the high surface area and oxide nature of SPM,and in this study,Mo had the highest EF of 46.77 probably due to its origin from continental weathering.From the ecotoxicological perspective,the integrated toxic risk index revealed low toxic risk to the benthic community.However,the mean-ERM-Quotient calculated using the particulate concentrations of As,Cd,Cr,Cu,Ni,Pb indicated 9%probability of toxicity to biota.The comprehensive geochemical and ecotoxicological assessment of particulate metal concentrations in the ELP lagoon signify low to moderate contamination. | Sandra Soledad Morales-García Pilar de Acacia Pérez-Escamilla Suresh Babu Sujitha Pichaimani Godwyn-Paulson Andrés Felipe Zuniga-Cabezas Muthuswamy Ponniah Jonathan | 2024 | Journal of Environmental Sciences2024，，2： | 0 |
| 4 | 1980~2018年太湖流域非点源氮磷负荷变化研究显示文摘文章采用SWAT模型,估算太湖流域1980~2018年的非点源氮磷污染负荷变化量,并通过分析土地利用变化,确定非点源氮磷负荷变化量对土地利用变化的响应。结果表明,太湖流域1980~2018年总氮(TN)、总磷(TP)负荷量总体呈下降趋势,下降总量分别为4.06万吨、1.77万吨;TN、TP负荷变化空间分布上表现较为一致,均是西北高、西南低的特点;TN、TP负荷变化量在不同地区差异较大:TN、TP负荷增加量在镇江地区最高,且由北向南逐渐增加;TN、TP负荷削减量在杭州和湖州地区最高,且由北向南逐渐增加。太湖流域1980~2018年土地利用转变过程中,耕地主要向建设用地转变;土地利用转变对TN、TP的削减程度不同,对于TN来说,耕地转为林地、草地转为林地时削减量最高;对于TP来说,耕地转为林地、建设用地转为林地时削减量最高。 | 杨佳磊 张瑞 张银意 王桂臣 | 2022 | 环境保护科学2022，48，6： | 0 |
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