Feasibility on artificial cultivation of bryophytes in rare earth tailings in southern Jiangxi
SHEN Faxing1,2, ZHENG Taihui2, DUAN Jian1, HU Rui2, YU Ronggang1
1. Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Jiangxi Academy of Water Science and Engineering, 330029, Nanchang, China; 2. College of Forestry, Jiangxi Agricultural University, 330045, Nanchang, China
Abstract：[Background] A large number of mine tailings have been generated by the excessive mining of rare earth ores. These tailings are characterized by low acidity, poor water storage capacity, low nutrient content, and high contents of rare earth and heavy metal elements, which seriously restrict the growth of plants. Biological soil crusts (BSCs) (associations of soil particles with mosses, fungi, algae, cyanobacteria, or lichens) are distributed extensively in South China, which can adapt to the arid and barren environment. Therefore, it may be used as an option for ecological restoration of mine tailings. However, limited information is available about the growth and influencing factors of artificial cultured BSCs in rare earth tailings.[Methods] Indoor incubation experiments of BSCs in the rare earth tailings were conducted to investigate the development characteristics of BSCs artificially cultivated in the rare earth tailings. Nine experimental treatments with 5 replications, including two factors (e.g. light intensity and soil water content) and three levels were randomly arranged. During the cultivation period (from November 2019 to July 2020), the coverage, plant density, and biomass of BSCs were dynamically monitored. The coverage, plant density, and biomass of cultivated BSCs were further statistically analyzed by univariate multivariate analysis of variance of a general linear model.[Results] 1) The indoor incubation experiment showed that the coverage of BSCs reached 100% in 80d, and the plant density was more than 54.8plants/cm2 in 140d, under the condition of high moisture (28%-30%). No significant differences in plant coverage and density existed among different light intensities.2) Also under the condition of high moisture, significant differences in moss biomass were observed among different light intensities in a decreasing order as follows:86.79mg/cm2 (at a medium light intensity of 5900lx), 70.15mg/cm2 (at a high light intensity of 5900lx), and 36.18mg/cm2 (at a low light intensity of 1900lx) (P<0.05). Under the conditions of medium soil moisture (13%-15%) plus medium light intensity, the coverage of BSCs was 54.07%, which was significantly higher than those under the conditions of medium soil moisture plus high light intensity and medium soil moisture plus low light intensity (P<0.05). Under the conditions of low soil moisture (5%-8%), BSCs could not grow and develop normally under all light intensities.[Conclusions] The obtained results indicate that BSCs could be used as a measure of ecological restoration in the rare earth tailings mining areas. Several moss species such as Trichostomum brachydontium, Trichostomum involutum, Anoectangium stracheyanum, and Brachymenium exile have good adaptability in vegetation restoration of rare earth tailings. Soil moisture is the most important factor affecting the development of BSCs. The optimal conditions for the growth of BSCs in rare earth tailings are soil water content of 28%-30% and light intensity of 5900lx.
ZHENG Taihui, YANG Jie, HUANG Pengfei, et al.Comparison of trace element pollution, sequential extraction, and risk level in different depths of tailings with different accumulation age from a rare earth mine in Jiangxi province, China[J].Journal of Soils and Sediments, 2018, 18(3):992.
[2]
EMILIO R, JAYNE B, BURKHARD B, et al.Dryland photoautotrophic soil surface communities endangered by global change[J].Nature Geoscience, 2018, 11(3):185.
[3]
SONG Zhengshan, STEFFEN Seitz, LI Jian, et al.Tree diversity reduced soil erosion by affecting tree canopy and biological soil crust development in a subtropical forest experiment[J].Forest Ecology and Management, 2019,444:69.
[4]
HUA Peilei, WEI Zhanga, XIAO Lumei, et al.Moss-dominated biological soil crusts modulate soil nitrogen following vegetation restoration in a subtropical karst region[J].Geoderma, 2019,352:70.
[5]
李斌,蔡奇英,刘以珍,等.赣南离子型稀土矿区苔藓植物区系及生活型分析[J].南昌大学学报(理科版),2021,45(1):63.LI Bin, CAI Qiying, LIU Yizhen, et al.Flora and life form of bryophytes in ionic rare earth mines of southern Jiangxi[J].Journal of Nanchang University (Natural Science), 2021, 45(1):63.
[6]
成向荣,邢文黎,苑海静,等.披针叶茴香对变化光环境的表型可塑性[J].生态学报,2019,39(6):1935.CHENG Xiangrong, XING Wenli,YUAN Haijing, et al.Phenotypic plasticity of Illicium lanceolatum in response to varied light environments[J].Acta Ecologica Sinica, 2019, 39(6):1935.
[7]
GREGORY P, TENNANT D, BELFORD R.Root and shoot growth, and water and light use efficiency of barley and wheat crops grown on a shallow duplex soil in a Mediterranean-type environment[J].Australian Journal of Agricultural Research,1992,43(3):555.
[8]
CECILIA R, IMMA P S,VALENTINA C, et al.Differential contribution of individual dehydrin genes from Physcomitrella patens to salt and osmotic stress tolerance[J].Plant Science, 2012,190:89
[9]
MELVIN J O, JEFF V W, et al.Bryophytes as experimental models for the study of environmental stress tolerance:Tortula ruralis and desiccation-tolerance in mosses[J].Plant Ecology, 2000(1):151.
[10]
LI Xinrong, HE Zhumin, STEFAN Z, et al.Micro-geomorphology determines community structure of biological soil crusts at small scale[J].Earth Surface Process and Landform, 2010,35(8):932.
[11]
杨永胜,冯伟,袁方,等.快速培育黄土高原苔藓结皮的关键影响因子[J].水土保持学报,2015,29(4):289.YANG Yongsheng, FENG Wei, YUAN Fang, et al.Key influential factors of rapid cultivation of moss crusts on Loess Plateau[J].Journal of Soil and Water Conservation, 2015,29(4):289.
[12]
吴鹏程,贾渝,王庆华,等.中国苔藓图鉴[M].北京:中国林业出版社,2018:33.WU Pengcheng, JIA Yu, WANG Qinghua, et al.Chinese illustrated bryophytes[M].Beijing:China Forestry Publishing House, 2018:33.
[13]
LAN Shubin, WU Li, ZHANG Delu, et al.Analysis of environmental factors determining development and succession in biological soil crusts[J].Science of the Total Environment, 2015,538:492.
[14]
吴玉环,黄国宏,高谦,等.苔藓植物对环境变化的响应及适应性研究进展[J].应用生态学报, 2001, 12(6):943.WU Yuhuan, HUANG Guohong, GAO Qian, et al.Research advance in response and adaptation of bryophytes to environmental change[J].Chinese Journal of Applied Ecology, 2001, 12(6):943.
[15]
刘俊华,包维楷.冷杉天然林下地表主要苔藓斑块生物量及其影响因素[J].植物学通报, 2006, 23(6):684.LIU Junhua, BAO Weikai.Major bryophyte patch biomass and relation with environmental factors in a coniferous forest of the eastern Qinghai-Tibetan Plateau[J].Chinese Journal of Applied Ecology, 2006, 23(6):684.
[16]
杨永胜.黄土高原苔藓结皮的快速培育及其对逆境的生理响应研究[D].北京:中国科学院研究生院(教育部水土保持与生态环境研究中心), 2015:81.YANG Yongsheng.Study on rapid cultivation of moss-dominated crusts on Loess Plateau and their physiological response to stress[D].Beijing:Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, 2015:81.
[17]
赵允格,许明祥,JAYNE Belnap.生物结皮光合作用对光温水的响应及其对结皮空间分布格局的解译:以黄土丘陵区为例[J].生态学报,2010,30(17):4668.ZHAO Yunge, XU Mingxiang, JAYNE B.Response of biocrusts photosynthesis to environmental factors:A possible explanation of the spatial distribution of biocrusts in the hilly Loess Plateau region of China[J].Acta Ecologica Sinica, 2010, 30(17):4668.
[18]
ANTONINKA A, BOWKER M A, REED S C, et al.Production of greenhouse-grown biocrust mosses and associated cyanobacteria to rehabilitate dryland soil function[J].Restoration Ecology,2016(24):324.
[19]
XU Shujun, YIN Chunsheng, HE Ming, et al.A technology for rapid reconstruction of moss-dominated soil crusts[J].Environmental Engineering Science, 2008, 25(8):1129.
[20]
HUI R, LI X R, JIA R L, et al.Photosynthesis of two moss crusts from the Tengger Desert with contrasting sensitivity to supplementary UV-B radiation[J].Photosynthetica, 2014, 52(1):36.
[21]
CRAVEN D, DENT D, BRADEN D, et al.Seasonal variability of photosynthetic characteristics influences growth of eight tropical tree species at two sites with contrasting precipitation in Panama[J].Forest Ecology and Management, 2010(10):261.
[22]
BERKELEY A, THOMAS A D, DOUGILL A J.Cyanobacterial soil crusts and woody shrub canopies in Kalahari rangelands[J].African Journal Ecology, 2005(43):137.
[23]
ZHENG Y P, LI R Q, GUO L L, et al.Temperature responses of photosynthesis and respiration of maize (Zea mays) plants to experimental warming[J].Russian Journal of Plant Physiology,2018,65(4):524.
[24]
TIAN Guiquan, BAI Xueliang, XU Jie, et al.Experimental studies on the natural restoration and the artificial culture of the moss crusts on fixed dunes in the Tengger Desert, China[J].Frontiers of Biology in China, 2006,1(1):13.
2022, Vol. 20 
