哀牢山高山森林系统土壤汞的海拔分布格局及其影响因素  

Understanding Mercury Altitudinal Distribution and Influencing Factors in Montane Forest Ecosystems of Ailao Mountain

作　　者：龚红梅 陈静怡 田朋 曾淑芳 黎贤铭 唐浩鹏 王训 王永敏[1] 王定勇[1] GONG Hongmei;CHEN Jingyi;TIAN Peng;ZENG Shufang;LI Xianming;TANG Haopeng;WANG Xun;WANG Yongmin;WANG Dingyong(College of Resources and Environment,Southwest University,Chongqing 400715,China;Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]西南大学资源环境学院,重庆400715 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550081

出　　处：《地球与环境》2023年第3期338-347,共10页Earth and Environment

基　　金：大学生创新创业训练计划项目(S202110635275);中国科学院大学生创新实践训练计划(20214000076)。

摘　　要：理解汞在高山森林生态系统中的海拔分布及其影响因素对于认识汞的生物地球化学循环具有重要意义。本研究以哀牢山东西坡的树叶、土壤O层、表层土壤(0~20 cm)及剖面土壤(0~100 cm)为研究对象,测定不同组分的汞、碳及氮含量。结果表明,哀牢山叶汞浓度无明显海拔分布格局,针/阔叶树种的叶汞浓度无显著差异;土壤O层中的汞浓度随土壤深度的增加而增加,与含碳量显著负相关,与含氮量显著正相关;表层土壤(0~20 cm)汞含量及土壤汞背景值(60~100 cm深层土壤汞浓度)均随海拔的上升而增加;表层土壤汞浓度与年降雨量、含碳量及含氮量显著正相关,与年均温度显著负相关。研究结果表明哀牢山高山森林土壤汞存在明显的海拔分布格局,且受到地质背景、气候、土壤有机质及其矿化程度的影响。Assessing the altitude distribution of mercury in alpine forest ecosystems and its influencing factors is of great significance for understanding the biogeochemical cycle of mercury.In this study,we determined the contents of Hg,C and N in leaves,O-horizon soil,topsoil(0-20 cm)and profile soil(0-100 cm)on the eastern and western slopes of the Ailao Mountain.The results showed that there were no obvious altitudinal distribution trends of mercury concentrations in leaves of the Ailao Mountain,also no significant differences of Hg concentrations between coniferous and broad-leaved tree species.Mercury concentrations in O-horizon soil increased with the increase of soil depth,negatively correlated with carbon content and positively correlated with nitrogen content.Hg concentration in topsoil(0-20 cm)and the background value of soil mercury(60-100 cm deep soil mercury concentrations)increased with the increase of altitude.Mercury concentrations in topsoil were positively correlated with annual rainfall,carbon content and nitrogen content,and negatively correlated with annual average temperature.The results showed that there is an obvious altitudinal distribution pattern of soil mercury in the Ailao Mountain Alpine forest,which is affected by geological background,climate,soil organic matter and its mineralization degree.

关 键 词：高山森林 土壤 汞 影响因素 

分 类 号：X53[环境科学与工程—环境工程]