九寨沟亚高山环境汞的空间格局-环境科学专业论文.docx

n(p=O．025)以及犀牛海入水口p=O．002)处有机质含量与汞含量呈现显著或极显 n(p=O．025)以及犀牛海入水口p=O．002)处有机质含量与汞含量呈现显著或极显 著的正相关关系，而双龙海入水E1(旷0．530)与犀牛海出水口(旷0．331)贝,U不呈现显 著性相关关系。 在百年尺度内，九寨沟沉积物中汞的沉积通量平均为O．009pg／mE／yr，并有较 为明显的时空格局，沉积通量的峰值出现在上世纪60．70年代。不同空间位 置，汞沉积通量存在明显的差异p<0．005)，其中犀牛海入湖处汞沉积通量最 大，最大值达到0．1031xg／m2／yr。 主要结论：在研究的空间尺度内，九寨沟亚高山环境的土壤、植被汞含量 的空间格局不明显，但不同植被类型下土壤渗滤液的空间趋势显著。土壤(沉 积物)pn、有机质，以及土壤渗滤液中的DOC可能对汞的迁移产生重要影 响。 九寨沟湖泊沉积物汞含量有明显的时空变化，汞的沉积通量速率与人类活 动对生态系统的扰动强度密切相关。 关键词：九寨沟汞沉积物土壤植物渗滤液 II 万方数据 Spatial Spatial patterns of mercury in subalpine environment at Jiuzhaigou Nature Reserve Major：Environmental Science Postgraduate：Peng Yao Tutor：He Lei Mercury iS a kind of global contaminant，once emitted to the atmosphere，mercury can travels worldwide before deposits to ecosystems in either wet or dry form，thus Can potential affect human health．Mercury content are elevated in high elevation mountain land by“elevation effect”，this made that kind of environment potentially gathering place of mercury．Jiuzhaigou National Nature Reserve，Easten Tibet Plateau， is an important part of World Natural Heritage and Man and the Biosphere Programme，andalsoatypicalexampleofsubalpineenvironment．Studyingthe mercury distribution characteristics in different medias of this area,will provide basic data for凡Inher research about the distribution,transformation，and bio-activity of mercury in subalpine environment；Also will be meaningful for forecasting the long‘ tenn effects of airborne mercury in subalpine environment and Can provide references for environmental protection policies making． Methods Stratified random sampling method Was used，sample plots Was set at di航rent altitIldes，then choose representative quadrats to collect soil，plant，litter s锄ples．Leachates Was collected by pre-embedded Lysimeters under different vegetations．covered area．Representative lakes were chosen to collect sediment samples． ResuIts The mean mercury contents of plants and litters in Jiuzhaigou subalpine enviroment are 0．044 mg／kg and 0．052mg／kg