Soil n-alkane δD vs. altitude gradients along Mount Gongga, China

Jia, Guodong; Wei, Kai; Chen, Fajin; Peng, Ping’an

doi:10.1016/j.gca.2008.08.004

Cited by 103 publications

(63 citation statements)

References 54 publications

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“…(Fig. 3) but the slope of the relationship was lower than that of Craig value of 8 for the global meteoric water line (Jia et al, 2008). When the slope is low, the implication is that soil water is subjected to evaporation through the dry surface layer (Jia et al, 2008).…”

Section: Resultsmentioning

confidence: 85%

“…3) but the slope of the relationship was lower than that of Craig value of 8 for the global meteoric water line (Jia et al, 2008). When the slope is low, the implication is that soil water is subjected to evaporation through the dry surface layer (Jia et al, 2008). The two points located farther from the points of local precipitation and at the upper end of the regression line are samples from the surface horizon (0.15 m) under CT in August and September 2009 (Fig.…”

Section: Resultsmentioning

confidence: 90%

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Estimation of soil water evaporative loss after tillage operation using the stable isotope technique

Busari¹,

Salako²,

Tuniz³

et al. 2013

International Agrophysics

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A b s t r a c t. Application of stable isotopes in soil studies has improved quantitative evaluation of evaporation and other hydrological processes in soil. This study was carried out to determine the effect of tillage on evaporative loss of water from the soil. Zero tillage and conventional tillage were compared. Suction tubes were installed for soil water collection at the depths 0.15, 0.50, and 1.0 m by pumping soil water with a peristaltic pump. Soil water evaporation was estimated using stable isotopes of water. The mean isotopic composition of the soil water at 0.15 m soil depth were -1.15‰ (d 18 O) and -0.75‰ (dD) and were highly enriched compared with the isotopic compositions of the site precipitation. Soil water stable isotopes (d 18 O and dD) were more enriched near the surface under zero tillage while they were less negative down the profile under zero tillage. This suggests an occurrence of more evaporation and infiltration under conventional then zero tillage, respectively, because evaporative fractionation contributes to escape of lighter isotopes from liquid into the vapour phase leading to enrichment in heavy isotopes in the liquid phase. The annual evaporation estimated using the vapour diffusion equation ranges from 46-70 and 54-84 mm year -1 under zero and conventional tillage, respectively, indicating more evaporation under conventional tillage compared with zero tillage. Therefore, to reduce soil water loss, adoption of conservation tillage practices such as zero tillage is encouraged.K e y w o r d s: evaporative loss, tillage, isotopic fractionation, isotope technique INTRODUCTIONTillage is mechanical manipulation of the soil for the purpose of crop production and it affects significantly soil characteristics such as soil water conservation, soil temperature, infiltration and evapotranspiration processes. As tillage is known to cause soil surface disruption, fractionation of stable isotopes following soil tillage has been documented (Angela et al., 2009). Although tilled plots may have very high initial infiltration rate values, these rates rapidly decline with time (Guzha, 2004) probably due to intense alteration of the top centimetres of the soil (Josa et al., 2010) and rapid structural deterioration caused by slaking and dispersion. However, due to the effect of increased soil organic matter (Lipiec et al., 2006) and soil surface protection, high infiltration under zero tilled (ZT) plots have been documented (Shukla et al., 2003). According to Gupta et al. (2004) less intense tillage keeps the crop residue at the soil surface, thereby increasing the activity of surface-feeding earthworms, leaving the root channels undisturbed, leading to the presence of numerous surface-connected macro-pores and inter-pedal, hence higher infiltration. It has been reported that lower soil temperature due to higher water content in the topsoil and more plant residues on the soil surface under ZT usually result in reduced evaporation, whereas the opening of topsoil enhances evaporation from the tille...

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 90%

Estimation of soil water evaporative loss after tillage operation using the stable isotope technique

Busari¹,

Salako²,

Tuniz³

et al. 2013

International Agrophysics

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“…72 Recently, novel proxies were developed based on the analysis of fossil organic 73 compounds containing environmental information in their structures. Notably, leaf wax 74 n-alkane δ²H (δ²H wax ) was proposed as a (paleo) elevation proxy (Jia et al, 2008) while 75 branched glycerol dialkyl glycerol tetraether (br GDGT) membrane lipids are 76 increasingly used as a (paleo) temperature proxy (Weijers et al, 2007). The combined use 77 of these 2 proxies could thus help to better constrain the relationships between 78 topography and climate in East Africa.…”

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confidence: 99%

Evaluation of branched GDGTs and leaf wax n-alkane δ2H as (paleo) environmental proxies in East Africa

Coffinet

Huguet

Pedentchouk

et al. 2017

Geochimica et Cosmochimica Acta

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“…show large spatial gradients between the low and high latitudes and arid and humid regions (Sachse et al, 2004(Sachse et al, , 2006Jia et al, 2008;Rao et al, 2009) reflecting global and local hydrological cycles (West et al, 2008). Hence, combination of chain-length distribution and dual-isotope ratios ( 13 C and D) of terrestrial biomarkers provides a powerful tool to access their source regions.…”

Section: Introductionmentioning

confidence: 99%

Long-range atmospheric transport of terrestrial biomarkers by the Asian winter monsoon: Evidence from fresh snow from Sapporo, northern Japan

Yamamoto

Kawamura

Seki

2011

Atmospheric Environment

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Molecular distributions of terrestrial biomarkers were investigated in fresh snow samples from Sapporo, northern Japan, to better understand the long-range atmospheric transport of terrestrial organic matter by the Asian winter monsoon. Stable carbon ( 13 C) and hydrogen (D) isotope ratios of C 22 -C 28 n-alkanoic acids were also measured to decipher their source regions. The snow samples are found to contain higher plant-derived n-alkanes, n-alkanols and n-alkanoic acids as major components. Relative abundances of these three biomarker classes suggest that they are likely derived from

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Soil n-alkane δD vs. altitude gradients along Mount Gongga, China

Cited by 103 publications

References 54 publications

Estimation of soil water evaporative loss after tillage operation using the stable isotope technique

Estimation of soil water evaporative loss after tillage operation using the stable isotope technique

Evaluation of branched GDGTs and leaf wax n-alkane δ2H as (paleo) environmental proxies in East Africa

Long-range atmospheric transport of terrestrial biomarkers by the Asian winter monsoon: Evidence from fresh snow from Sapporo, northern Japan

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