生态环境学报2024，Vol.33Issue(12)：1862-1873,12.DOI:10.16258/j.cnki.1674-5906.2024.12.004
秦岭典型钼矿区不同植物群落对矿区土壤碳汇效应研究
Effect of Different Plant Communities on Soil Carbon Sequestration in a Typical Mining Area of Qinling Mountains
摘要
Abstract
The Qinling region is rich in molybdenum(Mo)resources,and large-scale Mo mining has resulted in ecological issues.Increasing soil carbon storage may be a key measure for ecological restoration in mining areas.Assessing the contribution of native plants to soil carbon storage in mining areas may help to select a group of native vegetation species with good ecological recovery ability,which can accelerate the soil formation process and maintain soil fertility in mining areas.This study focused on different vegetation types in a naturally restored area of a molybdenum tailings pond in Qinling.By comparing the carbon content of surface and rhizosphere soils,the content of dissolved organic matter(DOM),the sources and types of DOM,the mineral phase composition of different rhizosphere soils,and the CO2 respiration of the rhizosphere soils,a selection of native wild plant species with high soil organic carbon sequestration benefits was made.The results showed that plant carbon sequestration generally ranged from 100%to 650%,with Phragmites australis,Imperata cylindrica,Anaphalis sinica,and Miscanthus being the most effective in soil carbon sequestration in the mining area.From the perspective of DOM,the DOM mass fraction of surface soils of various vegetation types ranged from about 12.35 to 20.96 g∙kg-1,and the DOM mass fraction of rhizosphere soils ranged from about 4.52 to 15.71 g∙kg-1,generally about 3-12 times the DOM content of exposed areas.Phragmites australis was more conducive to generating high DOM content.Compared to other plants,the CO2 respiration of the rhizosphere soils of Anaphalis sinica was higher,with the CO2 content reaching 3.5 times that of air at a soil depth of 5 cm.The EEM results showed that DOM mainly originated from the decomposition of litter and root exudates,with a higher humus content in the surface soil of Phragmites australis,contributing more to soil humus.From the perspective of soil carbon sequestration in mining area restoration,this study suggests that Phragmites australis,Anaphalis sinica,Miscanthus,and Imperata cylindrica can serve as pioneer plants for ecological restoration in the ecologically fragile areas of the Qinling molybdenum tailings pond.They can help increase carbon sequestration in the ecologically fragile areas of the Qinling Molybdenum tailings pond,thereby achieving long-term goals of ecological carbon sequestration and restoration.关键词
土壤碳含量/植物固碳/矿区碳增汇/矿区恢复/植物筛选Key words
soil carbon content/carbon sequestration by plants/carbon sink in mining area/mining area restoration/plant selection分类
资源环境引用本文复制引用
袁梦瑶,郭军康,赖潘民旺,胡渭平,王姊煜,贺峰,张敏,万学雅,张晨昊,张超..秦岭典型钼矿区不同植物群落对矿区土壤碳汇效应研究[J].生态环境学报,2024,33(12):1862-1873,12.基金项目
陕西省自然科学基础研究计划(2024JC-YBQN-0319) （2024JC-YBQN-0319）
陕西省科技创新团队项目(2022TD-09) （2022TD-09）
陕西省重点产业链项目(2022ZDLNY02-02) （2022ZDLNY02-02）
