干旱区生态环境知识资源中心(Arid): Supplemental precipitation accelerates decay but only in photodegraded litter and implications that sunlight promotes leaching loss

Arid

DOI	10.1007/s10533-022-00888-x
	Supplemental precipitation accelerates decay but only in photodegraded litter and implications that sunlight promotes leaching loss
	Day, Thomas A.; Urbine, Jennifer M.; Bliss, Michael S.
通讯作者	Day, TA (corresponding author)，Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA.
来源期刊	BIOGEOCHEMISTRY
ISSN	0168-2563
EISSN	1573-515X
出版年	2022
卷号	158 期号:1 页码:113-129
英文摘要	While moisture availability exerts strong controls on biogeochemical processes in drylands, several studies have found no relationship between litter decay and precipitation. We examined whether interactions between precipitation and photodegradation could play a role in the inconsistent response of decay to precipitation. We assessed mass loss of 4 leaf litter types on the surface of the Sonoran Desert over 9.5 months in a full-factorial experiment consisting of 3 radiation treatments (full sunlight, filtered from photodegrading (UV/violet-blue) sunlight, complete shade) and 2 precipitation levels (ambient, supplemental (2.7 x ambient)). Exposure to photodegrading sunlight nearly doubled (i.e. 1.9) litter mass loss, and in combination with supplemental precipitation accelerated decay by 2.6 times. Surprisingly, supplemental precipitation had no influence on decay of litter that did not receive photodegrading sunlight. That photodegradation was required for supplemental precipitation to accelerate decay could explain past findings that decay is not related to precipitation, as most studies assessed litter shaded by plant canopies. Sunlight or precipitation treatments had no effect on litter microbial respiration, even though concentrations of water-soluble compounds were > 2 times greater in photodegraded litter. In a second experiment, we assessed the mass loss from litter attributable to a 30-min immersion in water. Immersion losses were 2.5 times greater from litter exposed to photodegrading sunlight for 20 months in the field than litter filtered from this sunlight, and these losses were strongly correlated with decay. Our findings demonstrate that photodegrading sunlight greatly accelerates litter decay, precipitation magnifies this effect, and leaching is likely a significant mechanism.
英文关键词	Leaching Litter decomposition Photodegradation Precipitation Solar radiation Sonoran Desert
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000743854900001
WOS关键词	UV-B RADIATION ; PLANT LITTER ; ULTRAVIOLET-RADIATION ; DECOMPOSITION ; DESERT ; LIGNIN ; WATER ; LEAF ; EXPOSURE ; RAINFALL
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376545
作者单位	[Day, Thomas A.; Urbine, Jennifer M.; Bliss, Michael S.] Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA
推荐引用方式 GB/T 7714	Day, Thomas A.,Urbine, Jennifer M.,Bliss, Michael S.. Supplemental precipitation accelerates decay but only in photodegraded litter and implications that sunlight promotes leaching loss[J],2022,158(1):113-129.
APA	Day, Thomas A.,Urbine, Jennifer M.,&Bliss, Michael S..(2022).Supplemental precipitation accelerates decay but only in photodegraded litter and implications that sunlight promotes leaching loss.BIOGEOCHEMISTRY,158(1),113-129.
MLA	Day, Thomas A.,et al."Supplemental precipitation accelerates decay but only in photodegraded litter and implications that sunlight promotes leaching loss".BIOGEOCHEMISTRY 158.1(2022):113-129.