干旱区生态环境知识资源中心(Arid): Functional responses of biological soil crusts to simulated small precipitation pulses in the Monte desert, Argentina

Arid

DOI	10.1016/j.geoderma.2021.115660
	Functional responses of biological soil crusts to simulated small precipitation pulses in the Monte desert, Argentina
	Aranibar, Julieta N. N.; Repetur, Maria J. J.; Garcia, Vanesa R. R.; Dazat, Ricardo Elia J.; Videla, Maria Elena Corvalan E.; Villagra, PabloE.
通讯作者	Aranibar, JNN
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2022
卷号	410
英文摘要	In arid areas, biological activity responds to precipitation pulses, with different activation thresholds for different organisms. Biocrusts, communities of cyanobacteria, green algae, lichens and mosses living in the soil surface, contribute to soil fertilization by fixing atmospheric nitrogen (N), carbon (C), and solubilizing phosphorus (P). In this study, we hypothesized that biocrusts respond to low simulated precipitation pulses, lower than 10 mm, increasing nutrient availability. We expected biocrust organisms to increase soil net CO2 exchange, N fixation, soil N and P availability in response to small water pulses.& nbsp;In order to evaluate these predictions, we artificially irrigated soils with different covers, including those dominated by bare soil, mosses, and lichens, simulating precipitation pulses of 1, 3, 5, and 10 mm. We measured variables that change at short time scales (hourly), such as net CO2 exchange, N fixation and soil nitrate and phosphate availability, and those that change at larger time scales (years), such as organic matter and total N. Organic matter, total N, and phosphate concentrations were higher in soils with moss dominated biocrusts than in bare soils, indicating their importance to soil fertility in the long term. Soil net CO2 exchange, phosphate, and nitrate availability responded to the simulated precipitation pulses in all soil covers. Net CO2 exchange increased in all soil covers, but phosphate availability decreased in response to precipitation in moss dominated biocrusts. Nitrate availability was lower in lichen dominated biocrusts, although it increased in all soil covers in response to precipitation. These results show that although all the soils analyzed respond to low simulated precipitation pulses, biocrust organisms may retain soil nutrients and decrease availability to other organisms.
英文关键词	CO 2 exchange rates nitrogen fixation lichen moss nitrate phosphate
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000788759700004
WOS关键词	DOMINATED BIOCRUSTS ; NITROGEN-FIXATION ; CARBON RELEASE ; WATER PULSES ; LAND-USE ; RAINFALL ; CYANOBACTERIA ; RESPIRATION ; COMMUNITIES ; MULTISCALE
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/2XILL650/392909
推荐引用方式 GB/T 7714	Aranibar, Julieta N. N.,Repetur, Maria J. J.,Garcia, Vanesa R. R.,et al. Functional responses of biological soil crusts to simulated small precipitation pulses in the Monte desert, Argentina[J],2022,410.
APA	Aranibar, Julieta N. N.,Repetur, Maria J. J.,Garcia, Vanesa R. R.,Dazat, Ricardo Elia J.,Videla, Maria Elena Corvalan E.,&Villagra, PabloE..(2022).Functional responses of biological soil crusts to simulated small precipitation pulses in the Monte desert, Argentina.GEODERMA,410.
MLA	Aranibar, Julieta N. N.,et al."Functional responses of biological soil crusts to simulated small precipitation pulses in the Monte desert, Argentina".GEODERMA 410(2022).