China ; Conservation of Natural Resources ; Electricity

This paper presented a study on the dynamic of essential oil accumulation in Japanese mint SK33 (M. arrvensis L.) and the influence of storage time on its quantity and quality. This mint was cultivated at Co Nhue experimental station, Tu Liem district, Ha Noi City between 2000 and 2002. The results showed that during the vegetation and development process, the essential oil content in the plant gradually increased and achieved maximum at first branch flowering stage and reduced to minimum at the end of flowering stage. The menthol content in essential oil of Japanese mint SK33 reached the highest value at full flowering stage (81.79%). The best harvest time for this mint is from the beginning flowering stage to full flowering period. After harvesting the whole plants can be stored during 20 days without the change in content and quality of essential oil
oils ; Conservation of Natural Resources ; Oils, Volatile

The rapid appraisal method was used to identify the botanicals used ethnomedicinally from a total of 300 randomly selected respondents drawn from the existing three geo-political zones of Ekiti State, Nigeria. The results obtained revealed that about 40% of the 71 botanicals identified presently rare. Most of the presently abundant botanicals are species primarily cultivated for other purpose other than medicine. Most of the identified species are valued for their curative effects on malaria and fever, the predominant diseases in the study area. The need for the conservation of the rare species cannot be over emphasised as most rural dwellers in the study area depend mostly on herbs from these species. Strategies towards the attainment of this goal are proposed.
Conservation of Natural Resources ; Nigeria ; Plants, Medicinal

OBJECTIVETo investigate the common resource of Chinese herbal medicine in western of Luoding City, Guangdong Province, and propose pertinent suggestions concerning the exploitation,utilization and conservation of the medicinal resources.

METHODSWith plant taxonomy method, we selected the JiaYi town as the center for local common Chinese herbal medicine resources, ecological environment and non-governmental investigation of medicinal.

RESULTSThere were 123 species of medicinal plants in Jiayi Town, including pteridophyte 11 species, gymnosperm 5 species, dicotyledon 97 species,and monocotyledon 12 species.

CONCLUSIONThis region has an excellent ecological environment and forest plant communities preserved relatively intact suitable for the growth of Lingnan Chinese herbal medicine, as well as a profound cultural background of folk medicine. The resources should be actively protected for further rational development and utilization.

This study was conducted to investigate the wild and cultivated resource situation of Rheum tanguticum in main production area of China, estimate its reserves, and put forward the feasible approach for the sustainable utilization of R. tanguticum. On the basis of the literature data about R. tanguticum, conbined with interview, investigation and sampling investigation, the total reserve of resources is estimated using the route-quadrat method and the vegetation and soil-type map area method proposed by our research group. The results indicate that there is no obvious change between the present distribution ranges of the wild R. tanguticum and its historical records, but its population density has changed clearly. The reserve of the wild R. tanguticum has seriously declined in lots of place, even faced the exhaustion in some regions. According to the investigation, the resource reserve of the wild R. tanguticum is no more than 5 000 t, and the cultivated is about 1 607 t. The resource reserve of the wild R. tanguticum is nearly depleted, and this suggests that the wild R. tanguticum should be enrolled in the protection plant list, and the cultivated will become the main resource of Rhubarb in the future. So it is extremely neccessary to collect and protect the germplasm resource of R. tanguticum, establish the germplasm nursery and repository, and conduct breeding research on those bases.
China ; Conservation of Natural Resources ; Rheum ; growth & development

Collected and preserved germplasm resource of Dendrobium chrysotoxum to lay the foundation for screening fine germplasm. Through refering literatures, visiting and field survey to investigate the distribution, botanic characters and apply status of D. chrysotoxum, furthermore to collect the germplasm resource. The result show that wild germplasm resource of D. chrysotoxum has obvious differences in stem characters, leaf shape as well as flower color aspects. In addition, in recent ten years, the reserves of D. chrysotoxum germplasm resource seriously descended. Through this study, we can draw a conclusion that D. chrysotoxum germplasm resource exist diversity in biology. In these germplasm resource, there are high yield and good quality variety.
Conservation of Natural Resources ; Dendrobium ; growth & development

Conservation of Natural Resources ; Hypocreales ; isolation & purification ; Medicine, Chinese Traditional ; Natural Resources ; Species Specificity ; Tibet

Ecological stoichiometry is a study of the balance of biological system's energy and the balance of multiple chemical elements. It focuses on the relationship of the element ratio in ecological processes. In this paper, the concept and main theoretical basis of ecological stoichiometry were introduced, and the status of stoichiometry in medicinal plant resources was reviewed. According to the recent development of ecological stoichiometry, the future directions of ecological stoichiometry of medicinal plants could be the study of the relationship between stoichiometric characteristic and growth and secondary metabolism of medicinal plants, and the influence of biotic (or abiotic) factors on the stoichiometric characteristic of medicinal plants.
Conservation of Natural Resources ; Ecosystem ; Plants, Medicinal ; chemistry ; growth & development

China ; Conservation of Natural Resources ; Drug Industry ; Health Care Reform

At present the shortage of the resources of wild and rare medicinal plants is very serious in China. So grasping the situation and change tendency of medicinal plant resources comprehensive and real-timely, is vital significance to realize the sustainable using of medicinal plant resources. In order to use the remote sensing monitor technology and method to study the resources of the wild and rare medicinal plants, this article discusses the principle, method, technology and the principle and standard based on the operation and experiment of remote sensing monitor on the resources of wild rare medicinal plant.
China ; Conservation of Natural Resources ; methods ; Plants, Medicinal ; chemistry ; Satellite Communications