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water-stable
Biomass of fine roots and its relationship with water-stable aggregates in a composite ecosystem of triploid Populus tomentosa i
      
A study on the biomass of fine roots and its relationship with water-stable aggregates (WSA) was conducted in two herbaceous models, triploid Populus tomentosa + Lolium multiflorum (TL) and triploid P.
      
The amounts of water-stable aggregates of natural grass-forest lands (TN model) were higher than those of managed grass-forest lands (TL model).
      
Two-way analysis of variance indicated that fine roots (≤ 1 mm) could significantly enhance water-stable aggregates and total water-stable aggregates.
      
Mineralogy of the clay fraction of water-stable aggregates from dark gray forest soil
      
Regular structural changes of mixed-layered illite-smectite phases depending on aggregate sizes were revealed by x-ray powder diffraction analysis in the clay fraction of water-stable aggregates of dark gray forest soil.
      
It is shown that the amount of water-stable aggregates with a diameter larger than 0.25 mm varies within 70-80% upon different practices of primary tillage in the crop rotation system.
      
The initially water-stable aggregates of 0.25-0.5 mm in size are subjected to several stages of their breakdown under the impact of ultrasonic dispersion with the detachment of small particles from their surface layers.
      
The formation and disintegration of macroaggregates into water-stable particles in a wide range of soil water contents-from the hygroscopic moisture to the capillary saturation moisture-were analyzed.
      
It was found that the disintegration of macroaggregates into water-stable particles follows an exponential law.
      
Theoretical fundamentals and experimental methods to study the strength of water-stable bonds in soil aggregates are discussed.
      
The strength of water-stable aggregates characterized by cohesion is proved to be one of the important structural and mechanical properties of soil.
      
This can be due to the high content of carbonates and Ca2+ ions in these calcareous soils, that lead to an initially high content of water-stable macroaggregates.
      
Significance of individual components of organic matter in the formation of the water-stable structure of light gray forest soil
      
The effect of humus, readily decomposable organic matter, and carbohydrates of a nonspecific nature on the formation of water-stable aggregates in field rotation members has been studied.
      
In the surface-layer soil of sloping cropland, the contents of >amp;gt; 2 mm water-stable aggregates decreased obviously with apparent sandification.
      
Studies on soil organic carbon of density-isolated fractions and water-stable aggregates under different types of land use on bl
      
terrestris significantly reduced sludge depth and the surface organic-matter content of microcosm soil and significantly increased percentages of 4-mm diameter water-stable aggregates.
      
Leaf litter also significantly reduced sludge depth and increased 4-mm water-stable aggregates.
      
terrestris, reduced its 110-day survival rate, and inhibited the production of 4-mm water-stable aggregates in L.
      
 

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