The changed cases of the stairs along height above sea level in Cryptocaryachinensis Community on Dinghushan,and the communities comparison to 10 fo-rest communities on Dinghushan and Nankunshan and Jigongkeng are analysedwith the measurement of species similarity and cluster analysis.The relation a-mong 10 forest communities and the leaning of the development of some communi-ties are exposed.The analysis methods are valued.It shows that percentage of similarity is thebest among three methods of the measurement of species similarity.Cluster ana-lysis is a better method which is widely used.
According to the continental drift theory,the ancient ecology of the climateand geological vicissitude of the Cathaysian,Australian,South American,Afri-can,North American,Tropical Asian and Indian ancient lands or landmassesthroughout the Mesozoic Period are discussed.Subsequently,the characteristicsof the flowering floras of the ancient lands are analysed,the principal questionsunder discussion is concerning with the total amount,the composition and theantiquitic taxa,such as Magnoliales,Annonales,Ranunculales,Hamamelidales andthe orders of Amentiflorae,etc.And then,the discussed question falls on therelationship between the floras of the ancient lands and the Cathaysian flora.An interest and valuable existing State of affair has shown,that although theAustralian and the Antarctic landmasses was broke away from the mainland ofGongwana at the late Jurassic,but more than 40% of genera (998) are coexistingin Cathaysia and Australia; and in the proper order,a large amount of generaare found between the Cathaysia and India、Tropical Asia、north America、south America and Africa also.Thus it can be seen that the flowering plantswould be originate at the dawn of Triassic or Mesozoic,in other word,it wasoriginated before the breakdown of the unionized Pangaea,Such assessment isproved by the (?)ossils and the survived flowering plants.Following the driftinglandmasses,the flowering plants of all the continents are developed continuously along with the new environment.Lastly,a suggestion is given,that the Cathaysian flora is originated locally,since there are numerous primary taxa survived here which are not found fromother continents,and all the remaining landmasses either covered by the gra-cial or by the sea transgression,or by the droughty climate throughout theMesozoic Period,it is imposible to nurse the flowering plants,only the stabilized Cathaysia will become the cradle of the primary spermatophytes as well asof the flowering plants.
In order to research the effects of anthraquinones extracte from Rheum officinale Baill on prevention of high temperature of Macrobrachium rosenbergii, Macrobrachium rosenbergii were divided into five groups randomly. The controls were fed with basal diet, the treated groups were fed with basal diet supplemented with 0.05%, 0.10%, 0.200%, 0.40% anthraquinones extracte for 8 weeks, respectively. After that, shrimp were stressed by high temperature at 35 ℃ for 48 hours continuously. Then the growth and the changes of nitrogen oxide, lysozyme, glucose, triglyceride and cholesterol and in haemolymph before and after the stress were investigated. The results showed that 0.10% dose group significantly increased weight gains and reduced feed conversion rate, and 0.40% dose group significantly increased haemolymph lysozymes contents before the stress. After the stress, 0.10% and 0.20% dose groups were relatively higher in haemolymph lysozymes and nitrogen oxides contents than those of the control. Stress also caused mortality in all groups of which 0.10%~0.20% dose groups were less than 30%, but the control was about 60%. It is concluded that ingestion of 0.10%~0.20% dose of anthraquinones extracte could help prevent negative effects of stress and improve shrimp growth.
The perturbative method for calculating the effect of imperfectly conducting walls on the propagation of electromagnetic waves in cylindrical waveguides is reformulated. The equation for calculating the corrected eigenvalues is obtained in a quite different form. In comparison with the previous result, it is physically more transparent, formally simpler and more compact, and more convenient for practical calculations. 〖JP2〗Special cases overlooked previously are discussed. Results on the coaxial line are presented.〖JP〗
In order to study indoor air pollution, eight air pollutantsformaldehyde, benzene, methylbenzene,ethylbenzene,dimethylbenzen, TVOC, Rn and NH3 collected from 427 apartments in Guangdong Province were tested according to the indoor air quality standards（GB / T 18883－2002）. The results indicate that concentrations of formaldehyde, benzene, methylbenzene, TVOC, Rn and NH3 exceed 43.83%, 3.35%, 31.51%, 19.18%, 43.59%, and 0.57% of the standards, respectively. Indoor air is mainly polluted by organic pollutants. VOCs contain many complex components. Correlation coefficient between dimethylbenzen and other benzene series is above 0.60, much higher than that between benzene and other benzene series (<0.30).
Canna was planted in the eutrophication water with the technology of soilless culture in a polymethyl flume, and nitrogen was removed by the effection of plants absorbing and sorption, cooperated with bacteria. The experimental results show that nitrogen can be removed more by the canna floating bed in spring than that in autumn. The removal rate of total nitrogen was about 58.4% within five days, and the removal rate of NH+4-N was 100% within two days in spring. The removal rate of total nitrogen was about 50.4% within five days, and the removal rate of NH+4-N was 100% within four days in autumn. The removal rule is the same for different seasons.The experimental result is important to the floating bed operating in the whole year.
The ovules of Spermatophytes are derived from the Rhynia-like telome andthe fertil(?)-sporophyll respectively,from them five types of seeds and fruits,i.e.Ginkgoales-type,Cordaites-Bennettites-type,Cycadales-Angiosperm-type,Taxales-Gnetales-type and Coniferae-type are developed.The matured fertilized embryo-sacs of Ginkgo,Cycas,Taxus and Podocarpus are not simple seeds,since thecollar rim of Ginkgo,and the flesh cups of Taxus and Podocarpus are equivalentto the carpels as an effective protect tissue,they are primary types of fruits, which are originated from different ways in the early phylogeny,and differedfrom that of flowering plants;additionally,Gnetum is a well known Chlamvdo-sperm with double-fertilization and without archegonium.Only the Coniferaeis a real representive of Gymnosperm.In this paper,the traditional classification of Spermatophytes is rejected.Allthe Spermatophytes including various Pteridosperm.are divided into the follow-ing subdivisions,they are Pteridospermophytina,Glossopteridophytina,Conifero-phytina,Ginkgoophytina,Cycadophytina,Caytoniophytina,Sinodictiophytina,Taxophytina,Chlamydospermophytina and Phanerogamophytina.To the last sub-division,Phanerogamophytina,a new system is given also.