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The efficiency of light energy utilization of Platycladus orientalis was higher than that of Pinus tabulaeformis; PN, Tr and Ci of Platycladus orientalis and Pinus tabulaeformis were enhanced by increasing soil moisture content, whereas WUE declined.
      
Gross nitrification rates were positively correlated with water content (p >amp;lt; 0.05), but not with soil pH, organic matter, total nitrogen, or C/N ratios.
      
Denitrification rates in all the forest soils were low and not closely correlated with water content, soil pH, organic matter, or total nitrogen.
      
The extractable P pools by resin and sodium-bicarbonate decreased when soil organic carbon content was reduced.
      
The relationships of fine root biomass, SRL and RLD with available nitrogen in soil, average soil temperature per month in 10 cm depth and soil moisture content were analyzed.
      
Seasonal dynamics of fine roots was associated with available nitrogen in soil, soil temperature in 10 cm depth and moisture content.
      
Available NO3--N in soil, soil temperature in 10-cm depth and moisture content have a positive correlation with fine root biomass, SRL and RLD, although these correlations are not significant (P >amp;gt; 0.05).
      
But the compound effects of soil available N, soil temperature and soil moisture content are significant to every root parameter.
      
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 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.
      
Shear strength of undisturbed soils has a positive correlation with root content, and relevant regression models about undisturbed soil were established from this.
      
The results showed that different water treatments could effectively influence the content of the photosynthetic pigment, leaf gas exchange and apparent resources use efficiency of T.
      
The change of total N content in roots of the two types of C.
      
The content of total N, ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3--N), especially of NH4+-N and NO3--N, varied widely in different organs, with NH4+-N/NO3--N>amp;gt;1.
      
Effects of enhanced ultraviolet-B radiation on water use efficiency, stomatal conductance, leaf nitrogen content and morphologic
      
The objective of this study was to explore the effects of long-term UV-B enhancement on stomatal conductance, leaf tissue δ13C, leaf water content, and leaf area.
      
Particular attention was paid to the effects of UV-B radiation on water use efficiency (WUE) and leaf total nitrogen content.
      
Enhanced UV-B radiation significantly reduced leaf area (50.1%) but increased leaf total nitrogen content (102%).
      
The effects of UV-B on the plant were greatly affected by the water content of the deep soil (30-40 cm).
      
The water content, proline and chlorophyll content of different species changed with the increase in soil water stress.
      
 

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