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the community
Compared with other forest types, cycling rate of N in the community was lower than in deciduous broad-leaved forests, rain forests, and mangroves, and was moderate in evergreen broad-leaved forests.
      
The Shannon-Wiener index, evenness index, and abundance index in gap were higher than those under canopy in the seedling layer, while the community dominance in the seedling layer increased in closed canopy.
      
The total biomass accumulated with the development of the community.
      
The total biomass and the biomass of the organs were highest in the mature community and became stable as the community developed.
      
The biomass ratio of the slow growth group trees tended to increase and the fast-medium group trees tended to decrease as the community developed, which was reveresed in the decline development stage.
      
If species group III or II is the advantaged species in the shrub layer, the community would change from a coniferous forest to a sparse evergreen broad-leaved forest.
      
For group IV, the community would be relatively stable.
      
This was related to population features, the interaction with environmental factors, and their dominant position in the community.
      
The patches of dominant species were inter-distributed and overlapped, and formed the community pattern together.
      
This is beneficial for utilization of resources, and keeping the community stable.
      
We investigated the community structure of zoobenthos in Xiangxi Bay from August 2003 to August 2004.
      
At the community scale, a positive correlation was found for six of seven communities.
      
The size of the community is different and the number of these key groups is not certain.
      
A specific feature of the community was its ability to oxidize oil hydrocarbons under both aerobic and anoxic conditions.
      
The intensification of bioremediation is related to the increase in the population of the hydrocarbon-oxidizing microorganisms, first of all, denitrifying ones, resulting from the introduction of the community.
      
The variant proportions are more sensitive to variation of the requirements than the community size.
      
The community edificator species was replaced at pH 4-5.
      
Under these conditions, the community demonstrates the concentration of domination and decreased species richness due to the disappearance of closely related invertebrate species largely in biologically regressing groups.
      
A possibility to control the community structure is discussed.
      
Vertical heterogeneity of the community structure is weakly manifested, since dominant species are abundant in all horizons.
      
 

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