搜索结果: 1-15 共查到“理学 richness”相关记录16条 . 查询时间(0.07 秒)
Size-dependent species richness:trends within plant communities and across latitude
Community ecology plant size species packing species richness
2015/8/27
We examine how species richness and species-specific plant density (number of species and number of individuals per species, respectively) vary within community size frequency distributions and across...
Variation in demersal fish species richness in the oceans surrounding New Zealand:an analysis using boosted regression trees
Demersal fish Species richness Boosted regression trees Statistical model
2015/8/21
We analysed relationships between demersal fish species richness, environment and trawl characteristics using an extensive collection of trawl data from the oceans around New Zealand. Analyses were ca...
Taxon- and vector-specific variation in species richness and abundance during the transport stage of biological invasions
Taxon- and vector-specific variation species richness abundance the transport stage of biological invasions
2014/4/2
Recent empirical and statistical evidence suggest that propagule pressure (i.e., number of individuals introduced per event, and the number and frequency of events) and colonization pressure (i.e., nu...
Mollusk Species Richness on the Rocky Shores of the State of Guerrero, Mexico, as Affected by Rains and Their Geographical Distribution
Rocky Shore Species Richness Geographic Distribution Rain Effects Mollusks
2013/3/8
Natural processes in ecosystems shows significant variations in species richness with regular cycles that can be altered by natural or anthropogenic activities; the present research was in order to un...
Optical Redshift and Richness Estimates for Galaxy Clusters Selected with the Sunyaev-Zel'dovich Effect from 2008 South Pole Telescope Observations
galaxies clusters individual ]cosmology observations
2010/3/9
We present redshifts and optical richness properties of 21 galaxy clusters uniformly selected by their Sunyaev-Zel'dovich signature. These clusters, plus an additional, unconfirmed candidate, were det...
Spatial Patterns of Species Richness： A Hierarchical Perspective
geographic patterns Species Richness Spatial Patterns
2009/9/23
This paper examines several major geographic patterns of species richness and related hy—
potheses of mechanisms．These species patterns include latitudinal gradient，elevation gradient，
aridity gradi...
Maximum Species Richness： Where Is It？
Maximum Species Richness seed plants tempe rate zones
2009/9/23
W here does maximum species richness exist?
answered based on a large database．We examined
This frequently asked question has never been
about 10 000 species of seed plants in the northern
portion...
Biomass production in experimental grasslands of different species richness during three years of climate warming
Biomass production experimental grasslands species richness climate warming
2010/1/15
Here we report on the single and combined impacts of climate warming and species richness on the biomass production in experimental grassland communities. Projections of a future warmer climate have s...
期刊信息
篇名
Richness of Invariant Subspace Lattices For A Class Of Operators
语种
英文
撰写或编译
作者
刘明学,林辰
第一作者单位
刊物名称
Illinois journal of Mathematics
页面
47（3），581-591，2003年
出版日期
2003年
月
日
文章标识(ISSN)
相关项目
G-M型BAN...
Effects of climate warming and declining species richness in grassland model ecosystems:acclimation of CO2 fluxes
climate warming declining species richness grassland model ecosystems CO2 fluxes
2010/1/14
To study the effects of warming and declining species richness on the carbon balance of grassland communities, model ecosystems containing one, three or nine species were exposed to ambient and elevat...
Major contribution from littoral crustaceans to zooplankton species richness in lakes
littoral crustaceans zooplankton species
2014/5/5
A study of pelagic and littoral species richness among microcrustaceans in 2,466 Norwegian lakes recorded 120
crustacean species: 77 cladocerans, 31 cyclopoids, and 12 calanoids, respectively. Very f...
Community dominance by a canopy species controls the relationship between macroalgal production and species richness
Community dominance canopy species controls macroalgal production species richness
2014/5/4
By field manipulations of nutrients, propagules, and canopy cover in a shallow rocky subtidal, we show that dominance by a leathery macrophyte (Fucus vesiculosus) controls net production and the propa...
Linking bacterial richness with viral abundance and prokaryotic activity
Linking bacterial richness viral abundance prokaryotic activity
2014/5/9
We measured relative bacterial and archaeal richness and its covariation with physical and other biological parameters during six cruises in the North Sea over prokaryotic productivity levels ranging ...
The relationship between species richness and taxonomic distinctness in freshwater organisms
species richness taxonomic distinctness freshwater organisms
2014/5/9
Taxonomic distinctness is a newer biodiversity measure that emphasizes the average taxonomic relatedness between species in a community. We examined whether species richness (SR) and taxonomic distinc...
Millennial-scale relationships of diatom species richness and production in two prairie lakes
2014/5/16
Insight into the causes and consequences of changes in aquatic biodiversity requires an improved understanding
of the nature of the relationships between species richness and ecosystem function over ...