干旱区生态环境知识资源中心(Arid): Evidence for a fungal loop in shrublands

Arid

DOI	10.1111/1365-2745.13610
	Evidence for a fungal loop in shrublands
	Carvajal Janke, Niko; Coe, Kirsten K.
通讯作者	Janke, NC (corresponding author), Middlebury Coll, Dept Biol, Middlebury, VT 05753 USA. ; Janke, NC (corresponding author), Univ Calif Davis, Dept Viticulture & Enol, Davis, CA 95616 USA.
来源期刊	JOURNAL OF ECOLOGY
ISSN	0022-0477
EISSN	1365-2745
出版年	2021
卷号	109 期号:4 页码:1842-1857
英文摘要	Dryland communities may mitigate the loss of limited resources by exchanging nutrients through subterranean fungal connections, termed fungal loops. In arid grasslands, fungal loops can influence community composition and primary productivity, yet their ecological significance across dryland systems remains unexplored. We investigated the functional role of fungal loops in nutrient translocation in a North American shrubland ecosystem. We traced the movement of N-15 from moss-dominated biocrusts to the dominant xeric shrub Larrea tridentata, and the movement of C-13 from L. tridentata to biocrusts in plots established in situ in the Sonoran Desert. Measurements occurred at three time points spanning 1 week following a simulated 2.5 mm rainfall event, and at distances up to 1 m from tracer application. We also used ITS sequencing to investigate changes in fungal community composition in soils over the 1-week period. We discovered movement of N-15 from biocrusts into L. tridentata foliage as well as N-15 movement to other spatially isolated moss-dominated biocrust patches, yet this movement did not occur until 4-6 days post-rainfall, when significantly higher delta N-15 was observed in L. tridentata and biocrusts compared to previous days. We did not observe consistent patterns of C-13 movement from L. tridentata into neighbouring shrubs or biocrusts, suggesting differential environmental drivers for carbon movement in this system. Fungal communities exhibited a decrease in alpha diversity on the last day of the study, indicative of a delayed community response to rainfall concomitant with nutrient translocation. Fungal endophyte orders Pleosporales and Pezizales dominated all plot soils, and order Pleosporales was significantly more abundant in N-15 enriched plots, suggesting that dark septate endophytic fungi were involved in nitrogen translocation. The delay in nutrient translocation may reflect a rainfall-triggered rebuilding of mycelial networks between community members following drought. Synthesis. Our results point to fungal-mediated nutrient exchange pathways in a previously uninvestigated vegetation type, shrublands, where nutrients are translocated between moss-dominated biocrusts and nearby shrubs. We provide the first evidence that nutrient transfer may be delayed up to 6 days following rainfall, consistent with pulse-dynamic responses in drylands, and that moss-dominated biocrusts play a role in fungal loops.
英文关键词	dark septate endophyte drought response dryland Larrea tridentata moss‐ dominated biocrust nutrient exchange pulse delay stable isotope tracer
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000620184700001
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
来源机构	University of California, Davis
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350780
作者单位	[Carvajal Janke, Niko; Coe, Kirsten K.] Middlebury Coll, Dept Biol, Middlebury, VT 05753 USA; [Carvajal Janke, Niko] Univ Calif Davis, Dept Viticulture & Enol, Davis, CA 95616 USA
推荐引用方式 GB/T 7714	Carvajal Janke, Niko,Coe, Kirsten K.. Evidence for a fungal loop in shrublands[J]. University of California, Davis,2021,109(4):1842-1857.
APA	Carvajal Janke, Niko,&Coe, Kirsten K..(2021).Evidence for a fungal loop in shrublands.JOURNAL OF ECOLOGY,109(4),1842-1857.
MLA	Carvajal Janke, Niko,et al."Evidence for a fungal loop in shrublands".JOURNAL OF ECOLOGY 109.4(2021):1842-1857.