干旱区生态环境知识资源中心(Arid): Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California

Arid

DOI	10.1525/elementa.2022.00123
	Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California
	Krichels, Alexander H.; Homyak, Peter M.; Aronson, Emma L.; Sickman, James O.; Botthoff, Jon; Greene, Aral C.; Andrews, Holly M.; Shulman, Hannah; Piper, Stephanie; Jenerette, G. Darrel
通讯作者	Krichels, AH
来源期刊	ELEMENTA-SCIENCE OF THE ANTHROPOCENE
ISSN	2325-1026
出版年	2023
卷号	11 期号:1
英文摘要	Soil ammonia (NH3) emissions are seldom included in ecosystem nutrient budgets; however, they may represent substantial pathways for ecosystem nitrogen (N) loss, especially in arid regions where hydrologic N losses are comparatively small. To characterize how multiple factors affect soil NH3 emissions, we measured NH3 losses from 6 dryland sites along a gradient in soil pH, atmospheric N deposition, and rainfall. We also enriched soils with ammonium (NH4+), to determine whether N availability would limit emissions, and measured NH3 emissions with passive samplers in soil chambers following experimental wetting. Because the volatilization of NH3 is sensitive to pH, we hypothesized that NH3 emissions would be higher in more alkaline soils and that they would increase with increasing NH4+ availability. Consistent with this hypothesis, average soil NH3 emissions were positively correlated with average site pH (R2 = 0.88, P = 0.004), ranging between 0.77 & PLUSMN; at the least arid and most acidic site and 24.2 & PLUSMN; 16.0 mg N-NH3 m-2 h-1 and alkaline site. Wetting soils while simultaneously adding NH4+ increased NH3 emissions from alkaline and moderately acidic soils (F1,35 = 14.7, P < 0.001), suggesting that high N availability can stimulate NH3 emissions even when pH is less than optimal for NH3 volatilization. Thus, both pH and N availability act as proximate controls over NH3 emissions suggesting that these N losses may limit how much N accumulates in arid ecosystems.
英文关键词	Ammonia Drylands Nitrogen pH Rewetting Nitrogen limitation
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001048649600001
WOS关键词	AMMONIA VOLATILIZATION ; NITRIC-OXIDE ; NITROGEN ; THRESHOLD
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396047
推荐引用方式 GB/T 7714	Krichels, Alexander H.,Homyak, Peter M.,Aronson, Emma L.,et al. Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California[J],2023,11(1).
APA	Krichels, Alexander H..,Homyak, Peter M..,Aronson, Emma L..,Sickman, James O..,Botthoff, Jon.,...&Jenerette, G. Darrel.(2023).Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California.ELEMENTA-SCIENCE OF THE ANTHROPOCENE,11(1).
MLA	Krichels, Alexander H.,et al."Soil NH3 emissions across an aridity, soil pH, and N deposition gradient in southern California".ELEMENTA-SCIENCE OF THE ANTHROPOCENE 11.1(2023).