College of Land Science and Technology, China University of Geosciences, No.29, Xueyuan Road, Haidian District, Beijing, 100083, China.
Key Laboratory of Land Consolidation and Rehabilitation Ministry of Land and Resources, Beijing, 100035, China.
Environ Sci Pollut Res Int. 2020 Apr;27(12):13679-13691. doi: 10.1007/s11356-020-07886-2. Epub 2020 Feb 7.
Due to the vegetation destruction and soil desertification caused by excessive exploitation at Ganzhou ion-type rare earth mine in the mid-1980s, it is essential to carry out ecological remediation. The symbiotic mycorrhiza formed by the developed perennial ryegrass (Lolium perenne L.) roots infected with arbuscular mycorrhizal fungi (AMF) can significantly improve the growth and resistance of plants. In this study, the combination of symbiotic mycorrhiza and soil modifier was used to construct the ryegrass-AMF-soil modifier combined remediation technology, which achieved effective ecological remediation of soil tailings. The orthogonal experiment of soil modifier showed that the most efficient formula for ryegrass biomass, soil organic matter, soil alkaline hydrolysis, soil available phosphorus, and soil pH was 5 g/kg sepiolite, 3 g/kg chicken manure, 2 g/kg humic acid, and 2 g/kg biochar (ABCD), and chicken manure (B), humic acid (C), and biochar (D) had significant effects on the improvement of ryegrass biomass, soil organic matter, soil alkaline nitrogen, and soil available phosphorus. Sepiolite (A) had a significant improvement in soil pH. Furthermore, the AMF infection results indicated that Glomus moss (G.m.) had higher affinity with ryegrass. The T4 treatment-combined remediation using G.m. inoculation had the most significant effect on ryegrass growth; plant height increased by 39.19% compared with T1 treatment-inoculation using G.m. Under combined remediation, soil pH, organic matter, alkali nitrogen, and effective phosphorus content also significantly improved after combined treatment. Under G.m. inoculation treatment (T4 treatment), the soil nutrient content reached the three criteria of the soil nutrient grading standard.
由于 20 世纪 80 年代中期赣州离子型稀土矿过度开采导致植被破坏和土壤沙化，有必要进行生态修复。受丛枝菌根真菌（AMF）感染的多年生黑麦草（Lolium perenne L.）根系形成的共生菌根可以显著提高植物的生长和抗性。本研究采用共生菌根与土壤改良剂相结合的方法，构建了黑麦草-AMF-土壤改良剂联合修复技术，实现了土壤尾矿的有效生态修复。土壤改良剂的正交试验表明，黑麦草生物量、土壤有机质、土壤堿解氮、土壤有效磷和土壤 pH 值最有效的配方为 5 g/kg 海泡石、3 g/kg 鸡粪、2 g/kg 腐植酸和 2 g/kg 生物炭（ABCD），鸡粪（B）、腐植酸（C）和生物炭（D）对提高黑麦草生物量、土壤有机质、堿解氮和土壤有效磷有显著影响。海泡石（A）对土壤 pH 值有显著改善作用。此外，AMF 感染结果表明，摩西管囊霉（G.m.）与黑麦草具有更高的亲和力。接种 G.m.的 T4 处理联合修复对黑麦草生长的影响最为显著；与接种 G.m.的 T1 处理相比，株高增加了 39.19%。在联合修复下，土壤 pH 值、有机质、堿氮和有效磷含量在联合处理后也显著提高。在接种 G.m.处理（T4 处理）下，土壤养分含量达到土壤养分分级标准的三项标准。
