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clones
In order to identify the optimum cutting density for producing the highest number of plantable seedlings of poplar clones, a split-plot randomized block design was used to establish four cutting densities in plots.
      
Results indicated that the leaf area, stem and leaf biomass, and caliper of seedlings of all four poplar clones increased with the decrease in cutting density.
      
The quantity of first-grade seedlings (grade I) for clones Nanlin-95 and Nanlin-895 was achieved at the spacing of 40 cm×50 cm; for NL-1388 and NL-80351, it was 50 cm×50 cm.
      
According to the seedling quality and the number of plantable seedlings produced, the suggested cutting density for these four poplar clones was 50,000 stems/hm2.
      
Foliar Carbon Isotope Composition (δ13C) and Water Use Efficiency of Different Populus deltoids Clones Under Water Stress
      
Foliar carbon isotope composition (δ13C), total dry biomass, and long-term water use efficiency (WUEL) of 12 Populus deltoids clones were studied under water stress in a greenhouse.
      
Total dry biomass of clones decreased greatly, while δ13C increased.
      
Single-element variance analysis in the same water treatment indicated that WUEL difference among clones was significant.
      
Clones J2, J6, J7, J8, and J9 were excellent with high WUEL.
      
Extremely significant δ13C differences among water treatments and clones were revealed by two-element variance analysis.
      
Selection, propagation and cultivation of Pinus massoniana clones for pulp use
      
Based on the growth, wood property of the ortets, and rooting abilities of cuttings, 32 Pinus massoniana clones for pulp use were selected from forests of superior provenance, mixed families, and progeny test of seed orchard by two-step selection.
      
The average height and DBH growth of three-year-old clones were 28.6% and 16.7%, respectively, higher than those from seedlings, and average gain of wood density reached 8.7%.
      
Rooting rate of all these clones was over 80%, 28% higher than the clones selected by a single step.
      
With all the above techniques, 48 hm2 of clonal forests for pulp use of those clones had been planted in five places in Fujian Province.
      
In order to improve wood properties of triploid clones of Populus tomentosa, urea-formaldehyde (UF) resin was compounded with nano-SiO2, coupling agents and flame retardants in different ways to prepare five kinds of modifiers.
      
AFLP fingerprinting of elite varieties (clones) from the genus Populus
      
Accurate identification of varieties (clones) and knowledge of their genetic relationships are essential for poplar breeding and variety management.
      
In addition, our results demonstrated that AFLP could be used to construct DNA fingerprints of polar clones at a large-scale level and to determine genetic relationships of poplar varieties.
      
Given wood quality of all the families, and flowering and fruit settings of the clones in a seed orchard, twelve fine families were selected at 10% selection ratio of height growth and stem volume.
      
 

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