Nitrogen isotopic composition of plant-soil in the Loess Plateau and its responding to environmental change

Liu, Weiguo; Wang, Zheng

doi:10.1007/s11434-008-0442-y

Cited by 34 publications

(45 citation statements)

References 31 publications

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“…We observed no significant correlation between δ 15 N values of soil organic matter and mean annual precipitation, which is inconsistent with the results of previous studies [15], [18], [33]. Strong negative correlations of δ 15 N values of soil organic matter and mean annual precipitation have been observed in the Chinese Loess Plateau (1.31‰/100 mm) [33] and in the Kalahari region of southern Africa (0.56‰/100 mm) [18].…”

Section: Discussioncontrasting

confidence: 99%

“…4) are in agreement with the results of previous studies [5], [11], [15], [17], [18], [33]. However, there are differences in the sensitivity of plant δ 15 N to variation in mean annual precipitation.…”

Section: Discussionsupporting

confidence: 91%

“…Data from Zambia, Namibia and South Africa indicated that plant δ 15 N values declined 0.47‰ with every 100 mm increase in precipitation [18]. We observed a 1.0±0.1‰ decrease in plant δ 15 N values with every 100 mm increase in precipitation, which is greater than the results of those studies conducted in Africa, but similar to the results obtained in the Chinese Loess Plateau [33].…”

Section: Discussionsupporting

confidence: 82%

“…The observed mean leaf nitrogen isotope values are comparable to the published data set collected from the Loess Plateau of China [33] and Mount Kinabalu, Borneo [34]. The range of variation in leaf δ 15 N (−5.1‰ to 13.0‰) (Table S1) is greater than that in Chinese Loess Plateau [33] and Mount Kinabalu [34], however the observed shifts in leaf δ 15 N are within the range of foliar δ 15 N (from >−10‰ to <15‰) reported by Craine et al [21].…”

Section: Discussionsupporting

confidence: 79%

“…The range of variation in leaf δ 15 N (−5.1‰ to 13.0‰) (Table S1) is greater than that in Chinese Loess Plateau [33] and Mount Kinabalu [34], however the observed shifts in leaf δ 15 N are within the range of foliar δ 15 N (from >−10‰ to <15‰) reported by Craine et al [21]. The observed large variation in leaf δ 15 N is possible given that we sampled multiple plant species across a broad range of climate and ecosystem types.…”

Section: Discussionmentioning

confidence: 88%

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Variation in the Stable Carbon and Nitrogen Isotope Composition of Plants and Soil along a Precipitation Gradient in Northern China

et al. 2012

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Water availability is the most influential factor affecting plant carbon (δ 13C) and nitrogen (δ 15N) isotope composition in arid and semi-arid environments. However, there are potential differences among locations and/or species in the sensitivity of plant δ 13C and δ 15N to variation in precipitation, which are important for using stable isotope signatures to extract paleo-vegetation and paleo-climate information. We measured δ 13C and δ 15N of plant and soil organic matter (SOM) samples collected from 64 locations across a precipitation gradient with an isotherm in northern China. δ 13C and δ 15N for both C3 and C4 plants decreased significantly with increasing mean annual precipitation (MAP). The sensitivity of δ 13C to MAP in C3 plants (-0.6±0.07‰/100 mm) was twice as high as that in C4 plants (−0.3±0.08‰/100 mm). Species differences in the sensitivity of plant δ 13C and δ 15N to MAP were not observed among three main dominant plants. SOM became depleted in 13C with increasing MAP, while no significant correlations existed between δ 15N of SOM and MAP. We conclude that water availability is the primary environmental factor controlling the variability of plant δ 13C and δ 15N and soil δ 13C in the studied arid and semi-arid regions. Carbon isotope composition is useful for tracing environmental precipitation changes. Plant nitrogen isotope composition can reflect relative openness of ecosystem nitrogen cycling.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 88%

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Variation in the Stable Carbon and Nitrogen Isotope Composition of Plants and Soil along a Precipitation Gradient in Northern China

et al. 2012

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Isotopic composition and speciation of sedimentary nitrogen and carbon in the Okinawa Trough over the past 30 ka

et al. 2015

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Total organic carbon to total nitrogen ratios (C/N) and their isotopic compositions (δ 13 C TOC and δ 15 N TN ) are oft-applied proxies to discern terrigenous from marine-sourced organics and to unravel ancient environmental information. In high depositional Asian marginal seas, the inclusion of N-bearing minerals in the bulk sediment dilutes or masks signals sought after in δ 15 N and δ 13 C analyses, thus leading to incorrect and even contradictory interpretations. We used KOH-KOBr to separate operationally defined total organic matter into oxidizable (labile) and residual fractions for content and isotope measurements. In a sediment core in the Okinawa Trough, significant amounts of carbon and nitrogen existed in the residual phase, in which the C/N ratio was~9, resembling most documented sedimentary bulk C/N ratios in the China marginal seas. The residual carbon, which was included in operationally defined total organic carbon (TOC), displayed a δ 13 C range (À22.7 to À18.9‰, mean À20.7‰) similar to the oft-used marine end-member. After removing the interference from the residual fraction, we found that the temporal pattern of δ 13 C LOC (LOC denotes labile organic carbon) was more variable. The residual nitrogen content was associated with illite, suggesting a terrestrial origin. Additionally, δ 15 N in the residual fraction likely reflected the climatic controls (e.g., precipitation) on lithogenic source materials. Further studies are required to explore the controlling factors for carbon and nitrogen isotopic speciation and to retrieve the information locked in the residual fraction.

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Spatial patterns of leaf δ¹³C and δ¹⁵N of aquatic macrophytes in the arid zone of northwestern China

Gong

Peng

et al. 2021

Ecology and Evolution

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Nitrogen isotopic composition of plant-soil in the Loess Plateau and its responding to environmental change

Cited by 34 publications

References 31 publications

Variation in the Stable Carbon and Nitrogen Isotope Composition of Plants and Soil along a Precipitation Gradient in Northern China

Variation in the Stable Carbon and Nitrogen Isotope Composition of Plants and Soil along a Precipitation Gradient in Northern China

Isotopic composition and speciation of sedimentary nitrogen and carbon in the Okinawa Trough over the past 30 ka

Spatial patterns of leaf δ¹³C and δ¹⁵N of aquatic macrophytes in the arid zone of northwestern China

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Nitrogen isotopic composition of plant-soil in the Loess Plateau and its responding to environmental change

Cited by 34 publications

References 31 publications

Variation in the Stable Carbon and Nitrogen Isotope Composition of Plants and Soil along a Precipitation Gradient in Northern China

Variation in the Stable Carbon and Nitrogen Isotope Composition of Plants and Soil along a Precipitation Gradient in Northern China

Isotopic composition and speciation of sedimentary nitrogen and carbon in the Okinawa Trough over the past 30 ka

Spatial patterns of leaf δ13C and δ15N of aquatic macrophytes in the arid zone of northwestern China

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Spatial patterns of leaf δ¹³C and δ¹⁵N of aquatic macrophytes in the arid zone of northwestern China