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soils
Baldcypress should not be planted in drought-stricken soils.
      
Characteristics of the temperature coefficient, Q10, for the respiration of non-photosynthetic organs and soils of forest ecosys
      
The temperature coefficient, Q10 (fractional change in rate with a 10°C increase in temperature) describes the temperature sensitivity of soils, roots, and stems, as well as their possible performance in global warming processes.
      
The differences between woody organisms of stems, roots, and soils excluding roots were statistically significant (p>amp;lt;0.05), indicating that heterotrophic respiration from microorganism activity may be more sensitive to global warming.
      
The contents of aggregates of over 0.25 mm in two shrub land soils in the upper layer (0-20 cm) increased by 4.6% and 14.1% compared with farmland.
      
Nitrate has been recognized as the dominant mineral nitrogen form in most agricultural soils and the main nitrogen source for crops, but it is not usually the case in forest ecosystems.
      
A large number of studies show that the "nutrition habitats" associated with primary forest soils are typically dominated by NH4+ rather than NO3-, generally with NO3- content much lower than NH4+.
      
Low levels of NO3- in these forest soils generally correspond to low net rates of nitrification.
      
A preliminary study of the hydrological effects of forest litter and soils in the Simianshan Mountains was carried out.
      
An investigation of the physical properties shows that forest soils, to a depth of 1 m, have a powerful water-carrying ability, varying from 7.84 to 18.87 mm.
      
Denitrification rates in all the forest soils were low and not closely correlated with water content, soil pH, organic matter, or total nitrogen.
      
Results from this research suggest that gross nitrification is more responsible for the nitrogen loss from soils compared with denitrification.
      
Retention of available P in acid soils of tropical and subtropical evergreen broad-leaved forests
      
Precipitation of mineral phosphate is often recognized as a factor of limiting the availability of P in acidic soils of tropical and subtropical forests.
      
The lowest levels of extractable P pools occurred in the surface (0-10 cm) mineral soils of the Xishuangbanna forest.
      
Potential rates of microbial P immobilization were greater than those of organic P mineralization in mineral soils for both forests.
      
Shear difference of both undisturbed and remolded soils was compared at the same vertical loading, under the condition of the same dry density and water content from the same forest land.
      
The effect of roots (the finest roots) in soil-root composites (undisturbed soils) was analyzed.
      
The results indicate that undisturbed soils have higher shear resistance and less shear displacement than remolded soils at the same vertical loading, when both soils have the same dry density and water content under the same vegetations.
      
It has been shown that shear failure of undisturbed soils approximately indicate plastic failure, while shear failure of remolded soils is of the elastic nature.
      
 

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