Distribution, origin and speciation of soil selenium in the black soil region of Northeast China

Zhong, Xinlin; Gan, Yiqun; Deng, Yamin

doi:10.1007/s10653-020-00691-3

Cited by 16 publications

(4 citation statements)

References 42 publications

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“…Studies have found that clayey soil [41] has a good water retention capacity to maintain the normal growth of crops under drought conditions so that high and stable crop yields have a positive effect. The values of chlorophyll fluorescence parameters increased with increasing drought degree under black soil cultivation conditions, such as Phi2, PhiNO, and Fm, indicating that the electron transfer efficiency of soybean leaves under black soil cultivation conditions was higher, this may be related to the soil structure and deep humus layer in black soil [42]. The chlorophyll fluorescence parameters, such as PhiNPQ, Fv/Fm, and NPQ, decreased with an increase in drought degree.…”

Section: Discussionmentioning

confidence: 91%

Effects of Drought Stress on Key Enzymes of Carbon Metabolism, Photosynthetic Characteristics and Agronomic Traits of Soybean at the Flowering Stage under Different Soil Substrates

Song¹,

Li²,

Wang³

et al. 2022

Phyton

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Soybean is an important legume food crop, and its seeds are rich in nutrients, providing humans and animals with edible oil and protein feed. However, soybean is sensitive to water requirements, and drought is an important factor limiting soybean yield and quality. This study used Heinong 84 (drought resistant variety) and Hefeng 46 (intermediate variety) as tested varieties planted in chernozem, albic, and black soils. The effects of drought stress on the activities of key enzymes in carbon metabolism and photosynthetic characteristics of soybean were studied during the flowering stage, most sensitive to water. (1) The activities of SS-1, 6PGDH, and G6PDH enzymes in soybean leaves first increased and then decreased under drought stress. The enzyme activity was the highest under moderate drought stress and weakest in the blank group. (2) Drought stress increased Phi2, PhiNO, and Fm in soybean leaves and reached the highest value under severe drought; with the increase in drought stress, PhiNPQ and Fv/Fm of soybean leaves gradually decreased, reaching the lowest under severe drought. (3) With the increase in drought stress, F 0 and Fs of soybean leaves showed a single peak curve, and the maximum was at moderate drought. (4) Correlation analysis showed that F 0 was greatly affected by varieties and soil types; Fs, F0, and Fm soil varieties had a great influence, and chlorophyll fluorescence parameters were affected differently under drought stress with different drought degrees. (5) Drought stress changed the agronomic traits and yield of soybean. With the increase of drought degree, plant height, node number of main stem, effective pod number, 100-seed weight and total yield decreased continuously. (6) Drought stress affected the dry matter accumulation of soybean. With the increase of drought degree, the dry matter accumulation gradually decreased. Among them, the leaf was most seriously affected by drought, and SD decreased by about 55% compared with CK. Under the condition of black soil, the dry matter accumulation of soybean was least affected by drought.

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Section: Discussionmentioning

confidence: 91%

Effects of Drought Stress on Key Enzymes of Carbon Metabolism, Photosynthetic Characteristics and Agronomic Traits of Soybean at the Flowering Stage under Different Soil Substrates

Song¹,

Li²,

Wang³

et al. 2022

Phyton

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“…Soil is the main source of Se uptake by plants. The form of the Se in soil is affected by the soil clay content, redox potential, and pH [ 14 , 15 ]. Selenium and sulfur are elements of the chalcogen and have similar chemical properties.…”

Section: Selenium Uptake and Metabolism By Plantsmentioning

confidence: 99%

Advances in Research on the Involvement of Selenium in Regulating Plant Ecosystems

Chao¹,

Rao²,

Chen³

et al. 2022

Plants

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Selenium is an essential trace element which plays an important role in human immune regulation and disease prevention. Plants absorb inorganic selenium (selenite or selenate) from the soil and convert it into various organic selenides (such as seleno amino acids, selenoproteins, and volatile selenides) via the sulfur metabolic pathway. These organic selenides are important sources of dietary selenium supplementation for humans. Organoselenides can promote plant growth, improve nutritional quality, and play an important regulatory function in plant ecosystems. The release of selenium-containing compounds into the soil by Se hyperaccumulators can promote the growth of Se accumulators but inhibit the growth and distribution of non-Se accumulators. Volatile selenides with specific odors have a deterrent effect on herbivores, reducing their feeding on plants. Soil microorganisms can effectively promote the uptake and transformation of selenium in plants, and organic selenides in plants can improve the tolerance of plants to pathogenic bacteria. Although selenium is not an essential trace element for plants, the right amount of selenium has important physiological and ecological benefits for them. This review summarizes recent research related to the functions of selenium in plant ecosystems to provide a deeper understanding of the significance of this element in plant physiology and ecosystems and to serve as a theoretical basis and technical support for the full exploitation and rational application of the ecological functions of selenium-accumulating plants.

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“…The fitting effect of the constitutive equation for the soil in Heilongjiang is relatively lower. The reason for this is that the earth material in Heilongjiang is mainly black soil, which contains more humus [40], further aggravating the inhomogeneity of the earth material. Considering that soils containing humus are not suitable for use in building structures and that the agricultural value of black soil is greater than the value of building materials, the use of black soil as a building material is not recommended.…”

Section: Applicability Of the Modified Constitutive Equationmentioning

confidence: 99%

Study on Mechanical Properties and Constitutive Equation of Earth Materials under Uniaxial Compression

et al. 2022

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In this study, the uniaxial compressive mechanical properties of earth materials are tested, and the effects of four influencing factors, such as shape, size, curing age, and loading rate, on the strength, damage pattern, and stress-strain curve of the specimens are analyzed. The standard uniaxially compressed specimen size and the recommended loading rate are proposed for the earth specimens. The uniaxial compressive constitutive equations of earth materials are modified on the basis of the Illampas constitutive equation. By fitting the results of this study and typical literature tests, the applicability of the modified constitutive equation form to the uniaxial compressive test curves of soils in different regions of China based on standard sizes is verified. Finally, the formulae for calculating the parameters related to the constitutive equation of earth materials are established. In its application, only the compressive strength of 100-mm-cubic standard specimens with a curing age of 28 d needs to be measured to calculate and determine the specific values of the relevant parameters of the constitutive equation. This is a good reference value for promoting the development of computational analysis methods for earth structures and promoting the engineering design applications of earth structures.

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Distribution, origin and speciation of soil selenium in the black soil region of Northeast China

Cited by 16 publications

References 42 publications

Effects of Drought Stress on Key Enzymes of Carbon Metabolism, Photosynthetic Characteristics and Agronomic Traits of Soybean at the Flowering Stage under Different Soil Substrates

Effects of Drought Stress on Key Enzymes of Carbon Metabolism, Photosynthetic Characteristics and Agronomic Traits of Soybean at the Flowering Stage under Different Soil Substrates

Advances in Research on the Involvement of Selenium in Regulating Plant Ecosystems

Study on Mechanical Properties and Constitutive Equation of Earth Materials under Uniaxial Compression

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