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native soil
Many authors recommend the use of a native soil supporting climax vegetation that has undergone minimal anthropogenic disturbance as a high quality reference soil.
      
These associations affect the interaction of native soil microbes with their nutrient sources and control at least in part the distribution of foreign bacteria entering the soil system.
      
Water stability of aggregates amended with the fungus and the degrees of biodegradation of the binding agents by native soil microorganisms were determined by the wet-sieving method.
      
Soil moisture had profound effects on these processes and the mineralization of native soil organic S, oxidation of applied S0 and transformation of S0 into soil organic S proceeded most rapidly at 60% WFPS, irrespective of soil pH.
      
Mineralization of native soil organic S resulted in the accumulation of 34, 49 and 44?g SO42--S g-1 soil in acidic, neutral and alkaline soil in a 42-day period at 60% WFPS.
      
At the Glenrosa site, the natural δ13C abundance in soils was used to calculate the loss of forest-derived, native soil C and the concomitant input of sugarcane-derived C.
      
The response was measured in terms of dry matter yield, uptake of N from applied fertilizer and soil organic matter, loss of fertilizer N, and interaction of applied N with the native soil N.
      
Differences in native soil ecology associated with invasion of the exotic annual chenopod, Halogeton glomeratus
      
The release of native soil N was enhanced by NH4+ or NO3- addition compared to the values released by the unfertilized control and exceeded possible pool substitution.
      
Additional treatments comprised sterilized soil or native soil.
      
Plant dry weight at day?20 decreased with increasing percentage of native soil in the mix.
      
The bacterial community in the sterilized soil had a lower diversity and evenness than the native soil.
      
The difference in the growth-promoting potential of the two plant residues was related more to an increased uptake of the native soil N rather than to their direct role as a source of plant-available N.
      
Assuming that the addition of alfalfa residues did not affect the decomposition of native soil organic matter, only 23% of the alfalfa residues were found as CO2 monitored with a portable gas analyzer with a dynamic chamber.
      
Non-inoculated plants were nodulated by native soil born Rhizobium, either in control or desurfaced soil, but they showed low final nitrogen leaf content and low nitrogen fixation activity, suggesting that native rhizobia were ineffective.
      
A simplified belowground C budget for the site indicated that native soil organic matter still dominated the system, and that soil respiration was by far the largest flux.
      
Communities of 32 mostly annual species were grown for a full season in large containers (ca 400?kg each) on native soil and under a simulated winter climate of the northern Negev.
      
Monthly sampling of soil CO2 efflux and δ13C of soil respired CO2 between May and October 2002 allowed the partitioning of the flux into that derived from the labelled litter, and that derived from native soil organic matter and roots.
      
For NGL collars, the additional efflux was found to originate only in part from litter decomposition, but also from the decay of native soil organic matter.
      
Only plants from the native soil inoculation survived.
      
 

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