干旱区生态环境知识资源中心(Arid): Conversion of a Semiarid Nevada Soil to Irrigated Agriculture Preferentially Removes Labile Carbon

Arid

DOI	10.3390/soilsystems2030038
	Conversion of a Semiarid Nevada Soil to Irrigated Agriculture Preferentially Removes Labile Carbon
	Trimble, Brittany R.; Calderon, Francisco J.; Poulson, Simon R.; Verburg, Paul S. J.
通讯作者	Verburg, PSJ
来源期刊	SOIL SYSTEMS
ISSN	2571-8789
出版年	2018
卷号	2 期号:3
英文摘要	Due to the scarcity of arable land, semiarid rangelands are often converted to irrigated croplands, which is likely to affect soil organic carbon (SOC) due to changes in C inputs into the soil and environmental factors regulating decomposition. In this study, soil density and particle size fractions as well as their C and N contents, stable isotopic composition, and chemical characterization by mid-infrared spectroscopy were measured in a native shrubland and an adjacent agricultural site under alfalfa cultivation for at least 50 years in western Nevada. Cultivation significantly reduced the amount of C and N in the surface soils and the proportion of C present in the labile fractions. The delta C-13 and delta N-15 values of the SOC reflected dominant vegetation types at each site, and suggested most SOC was root-derived. The potential decomposition rate of SOC was higher in the shrubland than in the alfalfa surface soil reflecting the larger amount of labile C present in the shrubland soils. Spectroscopy results suggested that the greater recalcitrance of the alfalfa soils was due to insoluble SOC moieties. Additional analyses of buried, SOC-rich, A horizons at both sites showed that slower decomposition of 'deep' SOC was due to lower substrate quality supported by fractionation and spectroscopy data. The results of this study showed that converting a semiarid shrubland into irrigated cropland significantly reduced SOC content but increased overall stability of residual SOC.
英文关键词	land use change semiarid rangeland irrigated agriculture soil organic matter labile carbon stable carbon particle size fractionation density fractionation
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000452498800002
WOS关键词	LAND-USE CHANGE ; FT-IR SPECTROSCOPY ; NET ECOSYSTEM CO2 ; ORGANIC-MATTER ; NITROGEN DYNAMICS ; NATURAL-ABUNDANCE ; FOREST SOILS ; DESERT ; SEQUESTRATION ; C-13
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333121
作者单位	[Trimble, Brittany R.; Verburg, Paul S. J.] Univ Nevada, Dept Nat Resources & Environm Sci, Reno, NV 89557 USA; [Calderon, Francisco J.] ARS, USDA, Akron, CO 80720 USA; [Poulson, Simon R.] Univ Nevada, Dept Geol Sci & Engn, Reno, NV 89557 USA
推荐引用方式 GB/T 7714	Trimble, Brittany R.,Calderon, Francisco J.,Poulson, Simon R.,et al. Conversion of a Semiarid Nevada Soil to Irrigated Agriculture Preferentially Removes Labile Carbon[J],2018,2(3).
APA	Trimble, Brittany R.,Calderon, Francisco J.,Poulson, Simon R.,&Verburg, Paul S. J..(2018).Conversion of a Semiarid Nevada Soil to Irrigated Agriculture Preferentially Removes Labile Carbon.SOIL SYSTEMS,2(3).
MLA	Trimble, Brittany R.,et al."Conversion of a Semiarid Nevada Soil to Irrigated Agriculture Preferentially Removes Labile Carbon".SOIL SYSTEMS 2.3(2018).