干旱区生态环境知识资源中心(Arid): Clay minerals accelerate the formation of indoor biocrusts: Effects and mechanism

Arid

DOI	10.1016/j.still.2024.106217
	Clay minerals accelerate the formation of indoor biocrusts: Effects and mechanism
	Qian, Long; Wang, Jiping; Xiao, Jingshang; Yang, Lie; Xia, Ling; Song, Shaoxian; Farias, Maria E.; Wang, Zhaojun; Wu, Li
通讯作者	Wu, L
来源期刊	SOIL & TILLAGE RESEARCH
ISSN	0167-1987
EISSN	1879-3444
出版年	2024
卷号	244
英文摘要	The rapid formation or restoration of biocrusts by human intervention, such as constructing artificial biocrusts, is considered a promising technology for desertification control. To date, most of the studies mainly focused on the role of cyanobacteria and their excreted exopolysaccharides (EPSs) in the process of biocrusts formation and development, while few studies have been concerned about clay minerals, which play an important role in soil development as the abiotic factor. In this study, two clay minerals (montmorillonite and kaolinite) were added to crushed natural biocrusts at different ratios(0.5 %, 1 %, 2 %, 5 %, 10 %; w/w), aiming to explore the effects and mechanism of clay minerals on the formation of biocrusts. The results showed that low-level montmorillonite (0.5-2 %; w/w) addition significantly increased the photosynthetic biomass by about 50 % (indicated by Chlorophyll-a and gene copies) and promoted the accumulation of total nitrogen, nitrate nitrogen, ammonia nitrogen, and total organic carbon. The results of the structural equation model showed that the enhancement effect of clay minerals on the formation of biocrusts is mainly ascribed to its direct positive effect on biocrust physical stability and indirect positive effects through increasing both the cyanobacterial biomass and EPS excretion. Notably, the addition of montmorillonite increased the physical stability of the biocrusts by 18 %53 %, while kaolinite did not play a positive role in the formation of biocrusts. Moreover, excessive montmorillonite (more than 2 %) and kaolinite caused the significant shift of dominance from Cyanobacteria to Proteobacteria, and a sharp decrease in EPS excretion, posing a high risk of biocrust disintegration. Overall, our findings demonstrate the stimulation mechanism of clay addition on restoring natural biocrusts, providing new insight for constructing artificial biocrusts and restoring degraded biocrusts in dryland.
英文关键词	Biocrusts Clay EPS Biocrusts ' stability Nutrient retention
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001261282500001
WOS关键词	BIOLOGICAL SOIL CRUSTS ; EXTRACELLULAR POLYMERIC SUBSTANCES ; BIOGEOCHEMICAL INTERFACES ; DESERTIFICATION ; MONTMORILLONITE ; ADSORPTION ; KAOLINITE ; EXOPOLYSACCHARIDES ; MICROSTRUCTURE ; FERTILIZATION
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405658
推荐引用方式 GB/T 7714	Qian, Long,Wang, Jiping,Xiao, Jingshang,et al. Clay minerals accelerate the formation of indoor biocrusts: Effects and mechanism[J],2024,244.
APA	Qian, Long.,Wang, Jiping.,Xiao, Jingshang.,Yang, Lie.,Xia, Ling.,...&Wu, Li.(2024).Clay minerals accelerate the formation of indoor biocrusts: Effects and mechanism.SOIL & TILLAGE RESEARCH,244.
MLA	Qian, Long,et al."Clay minerals accelerate the formation of indoor biocrusts: Effects and mechanism".SOIL & TILLAGE RESEARCH 244(2024).