Quantification of soil macropores under alpine vegetation using computed tomography in the Qinghai Lake Watershed, NE Qinghai–Tibet Plateau

Hu, Xia; Li, Zong-Chao; Li, Xiaoyan; Liu, Lian-you

doi:10.1016/j.geoderma.2015.11.001

Cited by 74 publications

(37 citation statements)

References 35 publications

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“…and ASSt. ecosystem (X. Hu et al, ), which may explain the lower runoff depth for the PFSh. ecosystem.…”

Section: Discussionmentioning

confidence: 99%

“…For the ASSt. ecosystem, less rainfall input and high canopy interception due to the large crown reduced the water source (M. J. Zhang et al, ), whereas patchy spatial distribution and high macroporosity in shallow layers (0–20 cm) can also trap runoff (X. Hu et al, ; Jiang et al, ). Moreover, a previous study using the stable deuterium isotope method showed that both the Achnatherum splendens steppe and the Potentilla fruticosa shrub could shift their water source to deep soil layer and even groundwater when the shallow soil layer became less available (H. W. Wu et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Approximately 70–80% of the annual precipitation occurs in the summer and early autumn. The soil types are classified as Typic Cryoboroll and Typic Haploboroll according to USDA taxonomy, or Haplic Kastanozem and Cryi‐Haplic Kastanozem according to the World Reference Base for Soil Resources (X. Hu et al, ). The dominant vegetation types are Kobresia meadow (KMd.…”

Section: Methodsmentioning

confidence: 99%

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Measurements and Modeling of the Water Budget in Semiarid High‐Altitude Qinghai Lake Basin, Northeast Qinghai‐Tibet Plateau

Liu

et al. 2018

JGR Atmospheres

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Water budget plays an important role in ecological functions and biogeochemical cycles on the Qinghai-Tibet Plateau (QTP). However, the key factors that govern the water budget across spatiotemporal scales in natural conditions are poorly understood, especially in the alpine region. To advance our understanding of how and why the water budget varies at the ecosystem and catchment scales, this study measured and modeled the main water budget components in the Qinghai Lake Basin (QLB) and further investigated the key factors for evapotranspiration and streamflow. The results showed that most monthly precipitation from June to September was greater than the corresponding evapotranspiration from the high-altitude Kobresia meadow (KMd.) and Potentilla fruticosa shrub (PFSh.) ecosystem, and vice versa for the low-altitude Achnatherum splendens steppe (ASSt.) ecosystem. The mean annual proportions of evapotranspiration of precipitation for the KMd., PFSh., and ASSt. ecosystems were 0.83, 1.06, and 1.02, respectively, from 2014 to 2015. The study highlights that the high-altitude KMd. ecosystem is the main contributing area for runoff generation in the QLB. From ASSt. to PFSh. and then to the KMd. ecosystem, the key factors for evapotranspiration switched from water conditions to temperature conditions with the increase in elevation. The future scenario of climate warming and precipitation increase may cause a rise in evapotranspiration and streamflow in the QLB. Moreover, the increasing precipitation may be consumed mainly by evapotranspiration in the high altitude with low slope and by transfer into streamflow in the area with high slope.

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“…and ASSt. ecosystem (X. Hu et al, ), which may explain the lower runoff depth for the PFSh. ecosystem.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Measurements and Modeling of the Water Budget in Semiarid High‐Altitude Qinghai Lake Basin, Northeast Qinghai‐Tibet Plateau

Liu

et al. 2018

JGR Atmospheres

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“…The effect of soil macroporosity, temperature and water content on CO 2 efflux in the soils of different genesis and land management widely recognized (Lin et al, 2005;Jarvis, 2007;Hu et al, 2016). Reconstruction, visualization and quantification of 3-D macropore networks are essential for correlation macropore characteristics to their physical functions and for prediction of their dynamics under diverse land uses.…”

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confidence: 99%

The effect of soil macroporosity, temperature and water content on CO2 efflux in the soils of different genesis and land management

Kochiieru

Lamorski

Feiza

et al. 2018

Zemdirbyste-Agriculture

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This paper analyses the effects of soil macropores, temperature and water content on soil carbon dioxide (CO 2) efflux behaviour, which could help understand the mechanism of CO 2 efflux as influenced by soil type and land use methods. The temporal dynamic changes of CO 2 efflux from the soil surface using a closed chamber method (LI-COR LI-8100A Automated Soil CO 2 Flux System) were measured. Soil CO 2 efflux was investigated at a topsoil depth of 0-5 cm in (1) arable land under conventional tillage on Cambisol (CM), (2) grassland on Cambisol, (3) park on Cambisol, (4) arable land under conventional tillage on Retisol (RT), (5) grassland on Retisol and (6) forest on Retisol. CO 2 emission was measured six times per growing season from May to September in 2017. Soil macropore network was researched by implementing an X-ray computed tomography and carried out at the laboratory of the Institute of Agrophysics, Polish Academy of Sciences in Lublin, Poland. Macropores resulting from soil pedogenesis and land use methods played an important role on soil water, temperature and gas transport. The type of soil vegetation cover and amount of soil macropores significantly influenced soil respiration rate. The efflux values were recorded ranging from 0.71 to 3.43 μmol CO 2 m-2 s-1 (Cambisol) and from 0.70 to 3.05 μmol CO 2 m-2 s-1 (Retisol) in the grassland, from 0.43 to 2.57 μmol CO 2 m-2 s-1 (Cambisol) in the park, from 0.44 to 2.52 μmol CO 2 m-2 s-1 (Retisol) in the forest, from 0.52 to 2.68 μmol CO 2 m-2 s-1 (Retisol) and from 0.09 to1.57 μmol CO 2 m-2 s-1 (Cambisol) in the conventional tillage. Computational tomography data revealed that the content of macropores amounted to 10.75% in the grassland site, 1.97% in the park and 1.21% in the conventional tillage within the soil depth of 3-8 cm of the Cambisol and 6.45% in the forest, 4.94% in the conventional tillage and 3.86% in the grassland at the same soil depth of the Retisol. Soil temperature, water content and macroporosity were the main factors exerting the influence on soil gas origination rate. The relationship between soil CO 2 efflux and volumetric water content at a 5 cm depth can be described by a linear regression model y = 0.0943x − 0.7651, R 2 = 0.53 (valid for volumetric water content from 22.5 to 27.0 vol.% on Retisol and from 16.8 to 24.4 vol.% on Cambisol). Also, linear regression model y = 0.1167x − 0.8214, R 2 = 0.65 showed the relationship between soil CO 2 efflux and soil macroporosity at the 3-8 cm depth. Soil CO 2 efflux displayed a typical polynomial relationship with soil temperature at the 5 cm depth; however, the relationship was very weak. Both soil type and land use methods had a noticeable influence on macroporosity, surface area and macropore range of soil pore-size distribution. The amount of macropores in macropore geometry was an important factor when dealing with CO 2 flow. Topsoil CO 2 efflux under contrasting vegetation cover and management conditions on Cambisol and Retisol was directly related to soil macroporosity and volumetric...

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“…Os intra-agregados são responsáveis pela retenção e disponibilidade de água para as plantas, caracterizando-se por uma condução mais lenta da água no solo (Othmer et al, 1991, Ribeiro et al, 2006. As características dos poros são influenciadas pelas propriedades do solo e fatores externos (Luo et al, 2010, Lamandé et al, 2011Hu et al, 2016). A porosidade pode ser reduzida pelo entupimento dos poros com partículas que se soltaram de agregados sob o impacto das chuvas ou por deposição das partículas que se soltaram da superfície, formando crostas.…”

Section: Introductionunclassified

Microtomografia computadorizada de raios-X na caracterização morfométrica dos poros de Neossolo Regolítico Eutrofico

Costa

Antonino

Heck

et al. 2016

J. Env. Anal. Progr.

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O arranjo, orientação e organização dos grãos do solo de diferentes características são fatores determinísticos da estrutura do solo, como também, da porosidade desse meio. A porosidade possui forte influência na aeração, na transferência de água/solutos/gases/calor, na resistência à penetração e ramificação de raízes e no desenvolvimento de microorganismos, podendo ser um elemento importante na determinação da qualidade de um solo. A avaliação morfométrica do espaço poroso de um Neossolo Regolítico Eutrófico (NRe) utilizando a Microtomografia Computadorizada de Raios-x é objetivo deste estudo, onde foram analisados os atributos físicos do solo e os tamanhos, as formas e as inclinações dos vazios intra-agregados. O NRe apresentou uma porosidade de 28% (27% de vazios inter-agregados e 1% de vazios intra-agregados) e 73% de agregados. Cerca de 73% dos vazios intra-agregados possuem volumes entre 1,278 x 10-4 a 6,545 x 10-2 mm³. Há um maior volume de vazios complexos e alongados, os quais favorecem a condução de água pelo solo, e um maior volume de poros achatados, podendo indicar um certa compactação desse meio. Os vazios apresentaram-se em sua maioria como quase horizontais e inclinado, resultado da resistência a penetração de raízes devido a presença de lamelas argilosas nesse solo. A aplicação de microtomografia computadorizada de raios-X se mostrou eficiente na caracterização micromorfométrica da porosidade do solo.

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Quantification of soil macropores under alpine vegetation using computed tomography in the Qinghai Lake Watershed, NE Qinghai–Tibet Plateau

Cited by 74 publications

References 35 publications

Measurements and Modeling of the Water Budget in Semiarid High‐Altitude Qinghai Lake Basin, Northeast Qinghai‐Tibet Plateau

Measurements and Modeling of the Water Budget in Semiarid High‐Altitude Qinghai Lake Basin, Northeast Qinghai‐Tibet Plateau

The effect of soil macroporosity, temperature and water content on CO2 efflux in the soils of different genesis and land management

Microtomografia computadorizada de raios-X na caracterização morfométrica dos poros de Neossolo Regolítico Eutrofico

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