干旱区生态环境知识资源中心(Arid): Fungal connections between plants and biocrusts facilitate plants but have little effect on biocrusts

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DOI	10.1111/1365-2745.13310
	Fungal connections between plants and biocrusts facilitate plants but have little effect on biocrusts
	Dettweiler-Robinson, Eva; Sinsabaugh, Robert L.; Rudgers, Jennifer A.
通讯作者	Dettweiler-Robinson, Eva
来源期刊	JOURNAL OF ECOLOGY
ISSN	0022-0477
EISSN	1365-2745
出版年	2020
卷号	108 期号:3 页码:894-907
英文摘要	Species interactions may couple the resource dynamics of different primary producers and may enhance productivity by reducing loss from the system. In low-resource systems, this biotic control may be especially important for maintaining productivity. In drylands, the activities of vascular plants and biological soil crusts can be decoupled in space because biocrusts grow on the soil surface but plant roots are underground, and decoupled in time due to biocrusts activating with smaller precipitation events than plants. Soil fungi are hypothesized to functionally couple the plants and biocrusts by transporting nutrients. We studied whether disrupting fungi between biocrusts and plants reduces nitrogen transfer and retention and decreases primary production as predicted by the fungal loop hypothesis. Additionally, we compared varying precipitation regimes that can drive different timing and depth of biological activities. We used field mesocosms in which the potential for fungal connections between biocrusts and roots remained intact or were impeded by mesh. We imposed a precipitation regime of small, frequent or large, infrequent rain events. We used N-15 to track fungal-mediated nitrogen (N) transfer. We quantified microbial carbon use efficiency and plant and biocrust production and N content. Fungal connections with biocrusts benefitted plant biomass and nutrient retention under favourable (large, infrequent) precipitation regimes but not under stressful (small, frequent) regimes, demonstrating context dependency in the fungal loop. Translocation of a N-15 tracer from biocrusts to roots was marginally lower when fungal connections were impeded than intact. Under large, infrequent rains, when fungal connections were intact, the C:N of leaves converged towards the C:N of biocrusts, suggesting higher N retention in the plant, and plant above-ground biomass was greater relative to the fungal connections-impeded treatment. Carbon use efficiency in both biocrust and rooting zone soil was less C-limited when connections were intact than impeded, again only in the large, infrequent precipitation regime. Synthesis. Although we did not find evidence of a reciprocal transfer of C and N between plants and biocrusts, plant production was benefited by fungal connections with biocrusts under favourable conditions.
英文关键词	N-15 translocation Ascomycota biological soil crusts bunchgrass C N carbon use efficiency drylands fungal loop hypothesis
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000501670400001
WOS关键词	BIOLOGICAL SOIL CRUSTS ; CHIHUAHUAN DESERT ; MICROBIAL COMMUNITIES ; NITROGEN-FIXATION ; PULSE DYNAMICS ; WATER ; RESPONSES ; CARBON ; PRECIPITATION ; BIOMASS
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
EI主题词	2019-12-10
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311658
作者单位	Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA
推荐引用方式 GB/T 7714	Dettweiler-Robinson, Eva,Sinsabaugh, Robert L.,Rudgers, Jennifer A.. Fungal connections between plants and biocrusts facilitate plants but have little effect on biocrusts[J],2020,108(3):894-907.
APA	Dettweiler-Robinson, Eva,Sinsabaugh, Robert L.,&Rudgers, Jennifer A..(2020).Fungal connections between plants and biocrusts facilitate plants but have little effect on biocrusts.JOURNAL OF ECOLOGY,108(3),894-907.
MLA	Dettweiler-Robinson, Eva,et al."Fungal connections between plants and biocrusts facilitate plants but have little effect on biocrusts".JOURNAL OF ECOLOGY 108.3(2020):894-907.