干旱区生态环境知识资源中心(Arid): Occurrence of biological crusts and their relationship with vegetation on a chronosequence of abandoned gold mine tailings

Arid

DOI	10.1016/j.ecoleng.2019.07.029
	Occurrence of biological crusts and their relationship with vegetation on a chronosequence of abandoned gold mine tailings
	Nyenda, T.1,2,4; Gwenzi, W.3; Piyo, T. T.2,4; Jacobs, S. M.1
通讯作者	Nyenda, T.
来源期刊	ECOLOGICAL ENGINEERING
ISSN	0925-8574
EISSN	1872-6992
出版年	2019
卷号	139
英文摘要	Biological crusts (BCs) are soil ecological engineers critical in restoration yet their occurrence, and relationship with vegetation in a primary succession are poorly understood. The objectives of the study were: (1) to determine BC cover changes on a chronosequence and toposequence of tailings dumps and their correlation with vegetation structural and substrate attributes and (2) to determine vegetation community changes along a BC cover gradient. We hypothesized that: (1) BC cover significantly increased with tailings dump age and that it was positively correlated to vegetation cover, species richness, density, and (2) vegetation communities significantly varied along a BC cover gradient. Occurrence patterns of BCs and their relationship with vegetation attributes and substrate properties were assessed on six gold tailings of different ages (10, 17, 30, 82, 92 and 110 years). BC cover and vegetation attributes were studied in 1-m(2) quadrats. Texture, electrical conductivity (EC), total nitrogen (N), organic carbon (OC) and available metals (Zn, Ni and Mn) for surface tailings in patches with and without BCs were determined for each dump. Data were analyzed using two-way ANOVA, ordination analysis and Spearman correlation analysis. Two-way analysis of variance shows that age and topographic position had significant effect on BC covers. BC cover significantly increased with age as hypothesized, to a peak at 92 years and declined thereafter. Cyanobacteria and algae significantly decreased with age, while lichens and mosses increased significantly. A canonical correlation analysis (CCA) revealed a positive correlation between BC and vegetation cover, species richness and density on the four youngest dumps (10-82 years) which was however negative on the two oldest dumps (92 and 110 years). Areas of different BC cover classes (high = 70-100%, medium = 30-69%, low = 6-29% and very low <= 5%) were associated with different vegetation communities, with high and medium classes forming a similar vegetation community. A principal component analysis (PCA) based on tailings physicochemical properties showed that BC plots on the three younger dumps separated from those on the three older dumps, mainly based on variation in silt and total nitrogen content. The results point to the existence of a succession stage dependent relationship between BCs and vegetation. This suggest existence of a potential mutual relationship between BCs and vegetation on mine tailings, thus BCs can be used as proxy indicators of vegetation development.
英文关键词	Canonical correspondence analysis Chronosequence Correlation Cyanobacteria Lichens Nitrogen Organic carbon Species richness Vegetation cover
类型	Article
语种	英语
国家	South Africa ; Zimbabwe
收录类别	SCI-E
WOS记录号	WOS:000487810100016
WOS关键词	CANONICAL CORRESPONDENCE-ANALYSIS ; SOIL CRUSTS ; DISTRIBUTION PATTERNS ; PLANT LITTER ; DESERT ; SUCCESSION ; SURFACE ; COLONIZATION ; COMMUNITIES ; DISTURBANCE
WOS类目	Ecology ; Engineering, Environmental ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology ; Engineering
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310687
作者单位	1.Stellenbosch Univ, Dept Conservat Ecol & Entomol, Private Bag X1, ZA-7602 Matieland, South Africa; 2.Bindura Univ Sci Educ, Dept Environm Sci, P Bag 1020, Bindura, Zimbabwe; 3.Univ Zimbabwe, Dept Soil Sci & Agr Engn, Biosyst & Environm Engn Res Grp, POB MP 16, Harare, Zimbabwe; 4.Zimbabwe Mine Environm Res Network, 1 Adylin Rd, Harare, Zimbabwe
推荐引用方式 GB/T 7714	Nyenda, T.,Gwenzi, W.,Piyo, T. T.,et al. Occurrence of biological crusts and their relationship with vegetation on a chronosequence of abandoned gold mine tailings[J],2019,139.
APA	Nyenda, T.,Gwenzi, W.,Piyo, T. T.,&Jacobs, S. M..(2019).Occurrence of biological crusts and their relationship with vegetation on a chronosequence of abandoned gold mine tailings.ECOLOGICAL ENGINEERING,139.
MLA	Nyenda, T.,et al."Occurrence of biological crusts and their relationship with vegetation on a chronosequence of abandoned gold mine tailings".ECOLOGICAL ENGINEERING 139(2019).