摘要
赤泥是铝土矿提炼氧化铝后排放的强碱性废渣,数量巨大且环境风险大,如何改良及筛选适生植物是其生态修复的关键。该研究通过掺拌不同比例的马尾松叶2%,4%,6%(w/w),分析其对赤泥pH与有机质含量及芦竹与翠芦莉生长的影响。结果表明:掺拌马尾松叶35 d后,赤泥pH由11.08显著下降至9.70,但随后趋于平稳;随着掺拌比例的增加,赤泥pH呈下降趋势,有机质含量由6.13 g·kg^(-1)显著增至17.52 g·kg^(-1)。芦竹与翠芦莉在纯赤泥上生长2个多月后死亡,但在掺拌4%马尾松叶的赤泥上均能较好地生长。其中,芦竹的生物量及相对生长速率(RGR)与栽培土相比不受影响,但地下/地上生物量比(B/A)显著增加;相反,翠芦莉的生物量和相对生长速率与栽培土相比显著降低,但B/A不受影响。
Red mud is a waste residue with strong alkalinity after extracting alumina from bauxite. Due to its huge pro-duction and high environmental risks, how to remedy it and how to choose suitable plant species are key for ecologicalrestoration. In this study, we mixed different proportions of pine needles 2%, 4% and 6% （w/ w）, with the objective tostudy the changes of pH and organic matter content of red mud, and their effects on growth of Arundo donax and Ruelliabrittoniana, two alkali-tolerant species. The results indicated pH of red mud reduced significantly from 11.08 to 9.70 af-ter 35 d mixture with pine needles, and then leveled off. When the proportions of pine needles increased, pH of red muddecreased and organic matter content significantly increased from 6.13 to 17.52 g·kg^-1. When grown in pure red mud,Arundo donax and Ruellia brittoniana died after more than two months. However, they could grow well at amended redmud （mixed with about 4% pine needles）. Compared with limestone soil, Arundo donax had similar biomass and relativegrowth rate （RGR） but significantly higher below- / above-ground biomass （B/ A） in amended red mud, while Ruelliabrittoniana showed significantly lower biomass and RGR but similar B/ A.
作者
廖建雄
黄玉清
徐广平
何文
李艳琼
何成新
LIAO Jianxiong＊;HUANG Yuqing;XU Guangping;HE Wen;LI Yanqiong;HE Chengxin
出处
《广西植物》
CAS
CSCD
北大核心
2018年第6期704-709,共6页
Guihaia
基金
国家自然科学基金地区科学基金(31560089)
广西科技计划项目重点研发计划项目(桂科AB16380250)
广西植物研究所基本科研业务费项目(桂植业15001)
广西科学研究与技术开发计划项目主席科技资金项目(1324105)
关键词
赤泥
改良
马尾松叶
芦竹
翠芦莉
生长
red mud
amendment
pine needles
Arundo donax
Ruellia brittoniana
growth
