The collection of all the populations of different species in an area forms a ___. A. ecosystem B. biotic community C. population D. food chain 相关知识点: 试题来源: 解析 B。本题考查相关概念。一个区域内不同物种的所有种群的集合形成生物群落。选项 A“ecosystem”还包括非生物成分。选项 C“...
It is a natural process of animal species to become extinct (e.g. dinosaurs, dodos etc.). There is no reason why people should try to stop this from happening. Do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience....
Paired-correlation g(r) function showed that the main tree species had aggregated distributions,and the aggregation intensity decreased with the increasing distances. Environment variables had a strong effect on tree distribution,but the interpretation power of environment variables was very low in TPMF...
Caruso, A., E. Öckinger, C. Winqvist & J. Ahnström. 2015 . Different patterns in species richness and community composition between trees, plants and epiphytic lichens in semi-natural pastures under agri-environment schemes . Biodiversity and Conservation 24(7): 1729 – 1742 ....
species richness increased and community structure tended to become more complex.The shrub and forest-shrub transition communities were not stratified,but the forest community was.From shrub to forest,the proportion of individuals with small diameters gradually decreased.The total,tree and liana density ...
Tree species richness and stem density across girth classes in both the types decreased from the smallest to largest trees, while the occurrence rate of species increased with increase in girth class. A -test showed significant differences in species richness, basal area and the stand density at ...
The oviposition period of white wax insect is the key period of white wax production.The species and numbers of its natural enemy were investigated in the 10 main production areas in the oviposition period of white wax insect.The results showed that there were 15 natural enemy species of white...
there was a clear understory layer dominated by native species.The density and growth rate of E.adenophorum was inhibited in the replaced communities.In comparison with the E.adenophorum community,the plant diversity of replaced communities was greatly increased.Among the replaced communities,P....
as well as biodiversity,was analyzed.Weed community was classified into four functional groups,including monocotyledonous ephemeral(MA),dicotyledonous ephemeral(DA),monocotyledonous perennial,and dicotyledonous perennial group(DP).A total of 72 weed species,belonging to 27 families,were recorded in this...
G Pangging,A Ao,Anup Das 摘要: Species diversity and community structure of tropical wet evergreen forest of Singphan Wildlife Sanctuary was studied in three disturbance regime i.e., highly disturbed (HD), moderately disturbed (MD) and undisturbed (UD). A total of 185 species representing ...