Red soils with white net-like veins and their climate significance in south China

Hong, Hanlie; Gu, Yansheng; Yin, Kunlong; Zhang, Kexin; Li, Zhaohui

doi:10.1016/j.geoderma.2010.09.019

Cited by 41 publications

(19 citation statements)

References 21 publications

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“…At 500°C, the peak at 1.400 nm was either very small (Figures 2c and f The clay mineralogy appears therefore to be characterized by the presence of non swelling or poorly swelling clays. A similar clay composition with some illite/smectite interstratified clays was described by Hong et al (2010) in red soils located in southern China. Because of the lack of a swelling test using glycol or ethylene glycol in their study, the illite/smectite interstratified clays identified by the presence of a peak at 1.464 nm might in fact be chlorites or hydroxy-vermiculites such as for the soils selected for this study (Robert and Tessier, 1974).…”

Section: Basic Physico-chemical Characteristicssupporting

confidence: 74%

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Origin of the high sensitivity of Chinese red clay soils to drought: Significance of the clay characteristics

et al. 2014

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To cite this version:Benoît D'angelo, Ary Bruand, Jiangtao Qin, Xihnua Peng, Christian Hartmann, et al.. Origin of the high sensitivity of Chinese red clay soils to drought: significance of the clay characteristics. Geoderma, Elsevier, 2014, 223-225, pp.46-53. 10 AbstractThe red clay soils which are widespread in China are known to be highly sensitive to drought during the dry season but the origin of this high sensitivity to drought remains unclear.Several red clay soils were selected in the Hunan province for study. We studied their basic physico-chemical properties and clay mineralogy, their structure and shrinkage properties, as well as their water retention properties. Results show that the amount of water available between -330 and -15 000 hPa water potential is consistent with that recorded in many other clay soils from different parts of the world and thus cannot explain the high sensitivity of the red clay soils to drought. This high sensitivity to drought might be related to the high proportion of poorly available water which was characterized by the amount of available water between -3300 and -15 000 hPa water potential. Comparison with clay soils located in different parts of the world and for which the sensitivity to drought was not identified, showed that this proportion of poorly available water is indeed much higher in the red clay soils 2 studied than in clay soils representing a large range of both clay content and mineralogy. This specific behaviour of the red clay soils studied is thought to be related to the history of their parent materials: these materials are continental sediments which may have been submitted to great hydric stress, thus leading to strongly consolidated soils with consequences such as a high proportion of poorly available water, strong aggregation and weak shrinkage properties.

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Section: Basic Physico-chemical Characteristicssupporting

confidence: 74%

“…The fine silt (2-20 µm) content ranged from 382 to 505 g kg -1 (Table 1). A high fine silt content was also recorded in other red soils located in southern China (Hong et al, 2010). The pH ranged from 4.2 to 4.7 and increased with depth in the three soils studied (Table 1).…”

Section: Basic Physico-chemical Characteristicssupporting

confidence: 54%

Origin of the high sensitivity of Chinese red clay soils to drought: Significance of the clay characteristics

et al. 2014

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“…The middle to lower portions of the Jiujiang soil profile had an apparent net-like structure, with notably wider and longer white veins in the lower portion (6.9-14 m) and relatively thin and short ones in the middle portion (~3-6.9 m). Formation of the white net-like veins in the soil profiles needed abundant rainfall with clear dry seasons (Hong et al, 2010a;Yin and Guo, 2006), and the well-developed net-like veins in the lower portion are indicative of warmer and more humid climates over the soil-forming process relative to the upper portion, in good agreement with more abundant kaolinite and I/S clays, as well as the higher kaolinite content in the interstratified kaolinite-smectites in the lower portion.…”

Section: Discussionmentioning

confidence: 54%

Kaolinite–smectite mixed-layer clays in the Jiujiang red soils and their climate significance

Hong¹,

Churchman²,

Gu³

et al. 2012

Geoderma

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“…If oxygen supply (via diffusion) in the soil matrix is slower than its consumption (via microbial respiration), the interior of structural units (aggregates or peds) becomes oxygen depleted relative to the exterior (macropores) (as seen in Sexstone et al 1985), leading to gradients in redox potential (Zausig et al 1993). If these gradients persist, frequently promoted by seasonal water saturation (Jacobs et al 2002) or a continuous supply of root C (Richter et al 2007;Fimmen et al 2008;Hong et al 2010), they lead to the differentiation of redoximorphic features.…”

Section: Formation Of Anaerobic Microsites In Upland Soilsmentioning

confidence: 99%

Are oxygen limitations under recognized regulators of organic carbon turnover in upland soils?

et al. 2016

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Understanding the processes controlling organic matter (OM) stocks in upland soils, and the ability to management them, is crucial for maintaining soil fertility and carbon (C) storage as well as projecting change with time. OM inputs are balanced by the mineralization (oxidation) rate, with the difference determining whether the system is aggrading, degrading or at equilibrium with reference to its C storage. In upland soils, it is well recognized that the rate and extent of OM mineralization is affected by climatic factors (particularly temperature and rainfall) in combination with OM chemistry, mineral-organic associations, and physical protection. Here we examine evidence for the existence of persistent anaerobic microsites in upland soils and their effect on microbially mediated OM mineralization rates. We corroborate long-standing assumptions that residence times of OM tend to be greater in soil domains with limited oxygen supply (aggregates or peds). Moreover, the particularly long residence times of reduced organic compounds (e.g., aliphatics) are consistent with thermodynamic constraints on their oxidation under anaerobic conditions. Incorporating (i) pore length and connectivity governing oxygen diffusion rates (and thus oxygen supply) with (ii) 'hot spots' of microbial OM decomposition (and thus oxygen consumption), and (iii) kinetic and thermodynamic constraints on OM metabolism under anaerobic conditions will thus improve conceptual and numerical models of C cycling in upland soils. We conclude that constraints on microbial metabolism induced by oxygen limitations act as a largely unrecognized and greatly underestimated control on overall rates of C oxidation in upland soils.

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Red soils with white net-like veins and their climate significance in south China

Cited by 41 publications

References 21 publications

Origin of the high sensitivity of Chinese red clay soils to drought: Significance of the clay characteristics

Origin of the high sensitivity of Chinese red clay soils to drought: Significance of the clay characteristics

Kaolinite–smectite mixed-layer clays in the Jiujiang red soils and their climate significance

Are oxygen limitations under recognized regulators of organic carbon turnover in upland soils?

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