生态学报2017，Vol.37Issue(9)：3028-3035,8.DOI:10.5846/stxb201601210143
高山森林粗木质残体附生苔藓植物的重金属吸存特征
Heavy metal absorption characteristics of epiphytic moss on coarse woody debris in an alpine forest
摘要
Abstract
Coarse woody debris (logs,branches,snags,and stumps) constitutes a large component of forest biomass,and plays an essential role in many alpine forests.Coarse woody debris not only participates in material cycling and energy flow in the ecosystem,but also provides a suitable environment and abundant nutrients for the growth of epiphytic moss.Many studies have focused on the importance of moss as an absorber as well as indicator of heavy metal pollutants,especially pollutants from anthropogenic activities.Moss can absorb heavy metals from precipitation/wet deposition and directly from the substrate,and the concentrations of heavy metals in epiphytic moss are related to the local environmental conditions;total storage can be affected by the heavy metal content in the epiphytic moss and the biomass of the moss.However,the effect of the interaction between epiphytic moss and coarse woody debris on the sequestering of heavy metals in forest ecosystems remains unknown.In July 2015,the cadmium (Cd),lead (Pb),copper (Cu),and zinc (Zn) content and storage in epiphytic mosses on different types (logs,branches,snags,and stumps) and decay classes (Ⅰ-Ⅴ) of coarse woody debris were investigated in an alpine fir (Abies faxoniana) forest in western Sichuan.Results showed that an average of 4700 mg/hm2 of Cd,21236 mg/hm2 of Pb,6179 mg/hm2 of Cu,and 2622 mg/hm2 of Zn were sequestrated in the epiphytic mosses on the coarse woody debris in this region.The total storage of the four heavy metals in the epiphytic mosses was in the following order for coarse woody debris:logs ＞ branches ＞ snags ＞ stumps.Cd,Pb,Cu,and Zn storage in the epiphytic mosses on the logs accounted for 54.53％,66.08％,51.13％,and 66.30％ of total storage,respectively;Cd,Pb,Cu,and Zn storage in the epiphytic mosses on the roots accounted for less than 3％ of total storage.The characteristics of the heavy metal elements in the epiphytic moss was affected by the type and decay level of coarse woody debris.The content and storage of both Cd and Pb in the epiphytic mosses of the logs and large branches showed an "accumulation-release" pattern,and the highest values were observed in decay classes Ⅱ or decay classes Ⅲ.In contrast,the content and storage of Zn and Cu in the epiphytic mosses for all decay classes were insignificant.Overall,these results suggest that epiphytic moss on coarse woody debris greatly contributes to the sequestration of heavy metals in alpine forests;the results provide new insight into the cycling and transportation of heavy metals,as well as the role played by coarse woody debris in these alpine forest ecosystems.关键词
粗木质残体/附生苔藓/重金属/高山森林Key words
coarse woody debris/epiphytic moss/heavy metal/alpine forest引用本文复制引用
王壮,杨万勤,吴福忠,常晨晖,李俊,汤国庆,汪沁..高山森林粗木质残体附生苔藓植物的重金属吸存特征[J].生态学报,2017,37(9):3028-3035,8.基金项目
国家自然科学基金项目(31570445,31270498,31500509) （31570445,31270498,31500509）
