干旱区生态环境知识资源中心(Arid): Early exposure to UV radiation overshadowed by precipitation and litter quality as drivers of decomposition in the northern Chihuahuan Desert

Arid

DOI	10.1371/journal.pone.0210470
	Early exposure to UV radiation overshadowed by precipitation and litter quality as drivers of decomposition in the northern Chihuahuan Desert
	Hewins, Daniel B.1; Lee, Hanna 2; Barnes, Paul W.3; McDowell, Nathan G.4; Pockman, William T.5; Rahn, Thom 6; Throop, Heather L.7,8
通讯作者	Lee, Hanna
来源期刊	PLOS ONE
ISSN	1932-6203
出版年	2019
卷号	14 期号:2
英文摘要	Dryland ecosystems cover nearly 45% of the Earth's land area and account for large proportions of terrestrial net primary production and carbon pools. However, predicting rates of plant litter decomposition in these vast ecosystems has proven challenging due to their distinctly dry and often hot climate regimes, and potentially unique physical drivers of decomposition. In this study, we elucidated the role of photopriming, i.e. exposure of standing dead leaf litter to solar radiation prior to litter drop that would chemically change litter and enhance biotic decay of fallen litter. We exposed litter substrates to three different UV radiation treatments simulating three-months of UV radiation exposure in southern New Mexico: no light, UVA+UVB+Visible, and UVA+Visible. There were three litter types: mesquite leaflets (Prosopis glandulosa, litter with high nitrogen (N) concentration), filter paper (pure cellulose), and basswood (Tilia spp, high lignin concentration). We deployed the photoprimed litter in the field within a large scale precipitation manipulation experiment: similar to 50% precipitation reduction, similar to 150% precipitation addition, and ambient control. Our results revealed the importance of litter substrate, particularly N content, for overall decomposition in drylands, as neither filter paper nor basswood exhibited measurable mass loss over the course of the year-long study, while high N-containing mesquite litter exhibited potential mass loss. We saw no effect of photopriming on subsequent microbial decay. We did observe a precipitation effect on mesquite where the rate of decay was more rapid in ambient and precipitation addition treatments than in the drought treatment. Overall, we found that precipitation and N played a critical role in litter mass loss. In contrast, photopriming had no detected effects on mass loss over the course of our year-long study. These results underpin the importance of biotic-driven decomposition, even in the presence of photopriming, for understanding litter decomposition and biogeochemical cycles in drylands.
类型	Article
语种	英语
国家	USA ; Norway
开放获取类型	Green Submitted, gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000457744200011
WOS关键词	B RADIATION ; ABIOTIC DEGRADATION ; LIGNIN CONTROL ; PHOTODEGRADATION ; TERRESTRIAL ; CLIMATE ; MODEL ; GRASSLAND ; GRADIENT ; NITROGEN
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	Arizona State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218081
作者单位	1.Rhode Isl Coll, Biol Dept, Providence, RI 02908 USA; 2.Bjerknes Ctr Climate Res, NORCE Norwegian Res Ctr, Bergen, Norway; 3.Loyola Univ, Dept Biol Sci, New Orleans, LA 70118 USA; 4.Pacific Northwest Natl Lab, Richland, WA USA; 5.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; 6.Los Alamos Natl Lab, Earth & Environm Sci Div, Los Alamos, NM USA; 7.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA; 8.Arizona State Univ, Sch Life Sci, Tempe, AZ USA
推荐引用方式 GB/T 7714	Hewins, Daniel B.,Lee, Hanna,Barnes, Paul W.,et al. Early exposure to UV radiation overshadowed by precipitation and litter quality as drivers of decomposition in the northern Chihuahuan Desert[J]. Arizona State University,2019,14(2).
APA	Hewins, Daniel B..,Lee, Hanna.,Barnes, Paul W..,McDowell, Nathan G..,Pockman, William T..,...&Throop, Heather L..(2019).Early exposure to UV radiation overshadowed by precipitation and litter quality as drivers of decomposition in the northern Chihuahuan Desert.PLOS ONE,14(2).
MLA	Hewins, Daniel B.,et al."Early exposure to UV radiation overshadowed by precipitation and litter quality as drivers of decomposition in the northern Chihuahuan Desert".PLOS ONE 14.2(2019).