干旱区生态环境知识资源中心(Arid): Biological crusts enhance fertility and texture of gold mine tailings

Arid

DOI	10.1016/j.ecoleng.2019.03.007
	Biological crusts enhance fertility and texture of gold mine tailings
	Nyenda, T.1,2,3; Jacobs, S. M.1; Gwenzi, W.4; Muvengwi, J.5,6
通讯作者	Nyenda, T.
来源期刊	ECOLOGICAL ENGINEERING
ISSN	0925-8574
EISSN	1872-6992
出版年	2019
卷号	135 页码:54-60
英文摘要	Biological crusts (BCs) are reported to be soil ecological engineers critical in restoration of degraded ecosystems and rehabilitation of anthropogenic substrates, yet their occurrence and influence on such substrates is not well understood. We studied physical and chemical properties of biological crusts and layers immediately beneath them, compared with non-BC covered patches on two gold mine tailings dumps in tropical Zimbabwe. The aim was to determine the influence of biological crusts on fertility and texture of the substrate. We hypothesized that BCs alter tailings' chemical and physical properties, yielding improved fertility and finer texture and that the fertility and finer particle content would decrease with depth. Physicochemical properties of tailings were studied within 36 quadrats, each 30 cm x 30 cm, across two gold tailings dumps from three patches, namely; (1) patches consisting of BCs only, (2) patches with both BCs and vegetation, and (3) non-BCs patches without vegetation. In each patch, we sampled the crust along with two layers immediately below (0-1 cm and 1-5 cm). Patch type had a significant effect on mineral and total N, exchangeable K, Ca and Mg, organic carbon (OC), available and total Zn and Mn, and available Ni. The interactive effect of patch type and layer was significant for all parameters except OC and electrical conductivity (EC). Total N, OC, exchangeable Ca, K and Mg and silt content were signficantly higher on the BC patches than the bare patches. Overall, a PCA based on soil properties showed that sites in the three patches were distinct. Our results concurred with our hypothesis and point to the existence of significant effect of BCs on underlying substrate fertility. Results revealed a potential role for BCs in the early development of tailings, notably in enriching the soil N, OC, and basic cations. We recommend close monitoring of the evolution of BC on gold tailings to develop approaches to effectively remediate such environments using BCs.
英文关键词	Biological crusts Exchangeable bases Mine tailings Nitrogen Organic carbon Texture
类型	Article
语种	英语
国家	South Africa ; Zimbabwe
收录类别	SCI-E
WOS记录号	WOS:000470235100007
WOS关键词	NITROGEN-FIXING MICROORGANISMS ; SOIL CRUSTS ; POTENTIAL CONTRIBUTION ; TENGGER DESERT ; DIVERSITY ; SURFACE ; CYANOBACTERIA ; WASTELANDS ; GRASS
WOS类目	Ecology ; Engineering, Environmental ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology ; Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215176
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, Bag 1020, Bindura, Zimbabwe; 3.Zimbabwe Mine Environm Res Network ZIMERN, Agr House 1,Adylin Rd, Harare, Zimbabwe; 4.Univ Zimbabwe, Dept Soil Sci & Agr Engn, Biosyst & Environm Engn Res Grp, Box MP 167, Harare, Zimbabwe; 5.Bindura Univ Sci Educ, Dept Nat Resources, Private Bag 1020, Bindura, Zimbabwe; 6.Univ Witwatersrand, Sch Anim Plant & Environm Sci, Restorat & Conservat Biol Res Grp, Private Bag 3, ZA-2050 Johannesburg, South Africa
推荐引用方式 GB/T 7714	Nyenda, T.,Jacobs, S. M.,Gwenzi, W.,et al. Biological crusts enhance fertility and texture of gold mine tailings[J],2019,135:54-60.
APA	Nyenda, T.,Jacobs, S. M.,Gwenzi, W.,&Muvengwi, J..(2019).Biological crusts enhance fertility and texture of gold mine tailings.ECOLOGICAL ENGINEERING,135,54-60.
MLA	Nyenda, T.,et al."Biological crusts enhance fertility and texture of gold mine tailings".ECOLOGICAL ENGINEERING 135(2019):54-60.