Mechanism of Soil Sodification at the Local Scale in Songnen Plain, Northeast China, as Affected by Shallow Groundwater Table

Luo, Jinming; Yang, Fan; Wang, Y. J.; Ya, YE; Deng, Wei; Zhang, X. P.; Liu, Z.

doi:10.1080/15324982.2011.565856

Cited by 16 publications

(19 citation statements)

References 17 publications

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“…Thus, depressions were salt water exchange places. In a dry year, because the upper part and middle part of microtopography has higher temperature than that at lower part [10], the evaporation at the upper part and middle part of microtopography is higher than that at lower part. In the dry year, the evaporation shows relatively higher impact than the wet year.…”

Section: Key Factors Affecting Spatial Distribution Of Surface Soil Smentioning

confidence: 99%

“…Yang et al [29] found influence of capillary rise from shallow groundwater was less important due to aggravation of soil salinization. Luo et al [10] reported that the ground elevation has more effects on soil salinization than that of underground water. Microtopography affects hydrological processes in local scale, and affects the distribution and variations of surface soil salinity and sodicity, which in turn affects the movement of soil water and salts.…”

Section: Key Factors Affecting Spatial Distribution Of Surface Soil Smentioning

confidence: 99%

“…There were no significant differences in parameter values in EC, SC, Na + , and CO 3 2´b etween these two years. Because of high CV values for these parameters (CV > 1), soil salinity-sodicity in different ground elevation may be different under microtopography [10,15]. To further evaluate the impact of ground elevation gradient on these soil salinity-sodicity parameters (EC, SC, Na + , and CO 3 2´)…”

Section: Comparison Of Surface Soil Salinity-sodicity Parameters Betwmentioning

confidence: 99%

“…The scholars have noticed the heterogeneous distribution of soil salinity-sodicity under microtopography and carried out a lot of studies, such as soil moisture transform and distribution characteristics of soil salt under microtopography [10,15] and analysis of spatial variation of soil salinity-sodicity [16][17][18]. It is shown that the spatial variation of soil salinity is mainly affected by the environmental factors (the topography, hydrological process and climate conditions).…”

Section: Introductionmentioning

confidence: 99%

“…Salinization occurred when GW depth was less than 2.0 m with salinity higher than 0.48 dS/m [8,9]. For the GW with lower salinity, the GW table should not be shallower than 1.5 m [10]. By research of the effect of shallow underground water on the formation process of salinity-sodicity soil in Songnen Plain, results indicate that the shallow ground water level has already exceeded the critical water level (2-3 m) [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Variations on Soil Salinity and Sodicity and Its Driving Factors Analysis under Microtopography in Different Hydrological Conditions

Yang

et al. 2016

Water

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Abstract:Over three million hectares of salt-affected soils characterized with high salinity and sodicity caused serious land degradation in Songnen Plain, northeast China. Soil salinity-sodicity heterogeneous distribution under microtopography is usually influenced by several environmental factors. The side direction movement of soil water driven by water from depression is the key factor that aggravates the soil salinization under microtopography in dry condition. In this study, the differences in surface soil salinity-sodicity (0-10 cm) between dry year and wet year were compared, and the relationship between soil salinity-sodicity and environment factors such as ground elevation, surface ponding time, surface ponding depth, and soil moisture at four soil layers (0-10, 10-30, 30-60, and 60-100 cm) were analyzed using redundancy analysis (RDA) and simple correlation analysis (Pearson analysis) for two different hydrological years. Analyzed soil salinity-sodicity parameters include soluble ions (Na + , K + , Ca 2+ , Mg 2+ , CO 3 2´, HCO 3´, Cl´and SO 4 2´) , salt content (SC), electrical conductivity (EC), sodium adsorption ratio (SAR), and pH. Results showed that values of SAR, Cl´, and SO 4 2´w ere significantly higher in dry year than in wet year, while Ca 2+ , Mg 2+ , K + , and HCO 3´s howed the opposite results. Values of Na + , CO 3 2´, and EC were significantly higher at higher ground elevation gradient (20-40 cm) in dry year than wet year. Redundancy analysis indicated that spatial distributions and variations of salinity and sodicity in surface soil layer were related with environmental factors of ponding depth, ponding time and ground elevation in wet year, and they were related with ground elevation, ponding depth, ponding time, and soil moisture at 30-60 and 60-100 cm soil layer in dry year. Ponding depth and ground elevation rank first and second as the influential factors of the spatial distribution and variation of soil salinity-sodicity in wet year. However in dry year, primary and secondary influential factors are ground elevation and soil moisture at 60-100 cm soil layer.

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Section: Key Factors Affecting Spatial Distribution Of Surface Soil Smentioning

confidence: 99%

Section: Key Factors Affecting Spatial Distribution Of Surface Soil Smentioning

confidence: 99%

Section: Comparison Of Surface Soil Salinity-sodicity Parameters Betwmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variations on Soil Salinity and Sodicity and Its Driving Factors Analysis under Microtopography in Different Hydrological Conditions

Yang

et al. 2016

Water

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Runoff Shrinkage in the Wuyur River Basin, North‐east China, and Its Influence on the Succession of Saline Marsh in the Lower Reaches

Luo

Yang

Wang

et al. 2019

Irrigation and Drainage

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Drought induced by global climate change and local human disturbance is having a significant impact on the succession of inland saline marshes. This study aims to examine the causes of rapid land degradation in China's Zhalong wetland over the past 65 years (1951–2015) using the Mann–Kendall rank test. Results indicate that local human disturbance (mainly water diversion) is the key detrimental factor in marsh degradation. Water diversion in the upper reaches of the Wuyur river basin has changed the hydrological regime and caused significant water deficit in the Zhalong wetland, thereby leading to rapid shrinkage of the marsh. An increasing runoff trend with an average of 7.44 × 108 m3 was observed in the upper reaches from 1983 to 2015. In contrast, the runoff in the lower reaches had significantly decreased from 8.5 × 108 m3 to 3 × 108 m3 in recent years (P < 0.05), given the water consumed by local anthropogenic activities in the upper reaches. The large water deficit in the lower reaches reduced water storage and caused rapid development of soil sodification, that is, the area of Halaquepts increased from 170 km2 in 1979 to 260 km2 in 2010, in which large areas emerged in the core area of the wetland. Land degradation decreased the habitat of the red‐crowned crane (Grus japonensis). This condition may be an important contributor to the population decline of rare birds and biodiversity loss. © 2019 John Wiley & Sons, Ltd.

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On the Fundamental Causes of High Environmental Alkalinity (pH ≥ 9): An Assessment of Its Drivers and Global Distribution

et al. 2017

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Very alkaline environments exceeding calcite buffering are globally rare but conspicuous in many sedimentary plains of the World. While the deleterious effects of high alkalinity on soils are well understood, less agreement exists on its causes. We revise these causes to understand these exceptional environments and explain the pervasiveness of calcite buffering elsewhere. We argue that the injection of respired CO2 into stagnant hydrological systems subject to evaporative discharge is the key context for high alkalinization. The evolution of evaporites in nature reaches highly alkaline stages only when excess of (bi)carbonate with respect to divalent cations occurs. In most dry landscapes, evaporating groundwater solutions lose this condition as respired inorganic carbon (recharge zone supply) equilibrates with divalent cations from rocks (whole hydro‐trajectory supply). Groundwater in stagnant landscapes avoids this limitation owing to short/shallow trajectories sustaining (bi)carbonate excess until evaporative discharge zones are reached. Flat sedimentary landscapes that are (i) wet enough to develop stagnation and have shallow water tables but (ii) sufficiently dry to expose them to evaporative concentration should host very alkaline soils. This is confirmed with >9,000 soil profiles from the global WISE database, which shows that profiles with pH ≥ 9 in the top meter are 2·7% globally but 18% in areas with low slope (<0·05%, 25‐km radius, SRTM digital elevation model (SRTM DEM)) and semiarid–subhumid climate (annual precipitation to potential evapotranspiration ratio = 0·2–1, CRU database). Understanding how climate and vegetation change as well as irrigation practices influence hydrological stagnation and evaporative concentration may provide the key to manage very alkaline environments. Copyright © 2017 John Wiley & Sons, Ltd.

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Mechanism of Soil Sodification at the Local Scale in Songnen Plain, Northeast China, as Affected by Shallow Groundwater Table

Cited by 16 publications

References 17 publications

Variations on Soil Salinity and Sodicity and Its Driving Factors Analysis under Microtopography in Different Hydrological Conditions

Variations on Soil Salinity and Sodicity and Its Driving Factors Analysis under Microtopography in Different Hydrological Conditions

Runoff Shrinkage in the Wuyur River Basin, North‐east China, and Its Influence on the Succession of Saline Marsh in the Lower Reaches

On the Fundamental Causes of High Environmental Alkalinity (pH ≥ 9): An Assessment of Its Drivers and Global Distribution

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