[Study on ecological environment and accompanying plants' community characteristics study of wild Panax japonicus in Enshi].[Pubmed: 28891605]

The paper is aimed to study the distribution, population density, soil conditions and community characteristics of accompanying plants' in Enshi sub-regional different areas, with a typical habitats investigation method. The results showed that the wild Panax japonicus mainly distributed in moist places under the forests, by streams, or secondary forests of high grass, within east longitude 29°-30°, north latitude 108°-110°and about 1 000-15 00 meters above sea level. The soils were mainly tide soil and humus with yellow-brown soil, yellow soil and red soil, and the humus thickness was5-30 centimeter, pH 6.0-6.8, the moisture content of 16.8%-24.2%, soil bulk density of 1.39-2.12. Its geographical vegetation types were mainly evergreen coniferous forest, evergreen-deciduous mixture broad leaved forest and evergreen coniferous forest mixed deciduous broad-leaved forest, including three levels community structure of arbors, shrubs and herbaceous; Its accompanying plants reached 86 families, 118 genera, 134 species of seed plants, the arbors included 15 families, 21 genera, 26 species and the dominant species community mainly Pinaceae such as Pinus massoniana, P. tabuliformis, P. henryi and Taxodiaceae such as Cunninghamia lanceolata, Cryptomeria fortunei etc. The shrubs included 39 families, 54 genera, 62 species with the dominant species such as Camellia oleifera, Kalopanax septemlobus, Akebia trifoliata, Trachycarpusfortunei, Rhamnus globosa, Smilax corbularia and so on. The herbaceous included 32 families, 43 genera, 46 species, and Ferns such as the black-footed Dryopteris, Dryopteris crassirhizom, Coniogramme affinis, Polystichum tripteron, Adiantum pedatum, Lunathyrium acrostichoides, Woodsia ilvensis and Woodwardia japonica were dominant species. The cover layer covered a large number of lichens and mosses. The wild P. japonicus can be found among the P. massoniana, P. tabuliformis, P. henryi, lichens and mosses. These may indicate that the wild P. japonicusin Enshi requires higher demands on the ecological environment, its accompanying plants are mainly the tree layer-shrub layer-herb layer, and vertical structure is obvious. The study provides a basis for domestication and conservation of P. japonicus resources.

[Textual research on original plant of Chinese herbal medicine Cyrtomium Rhizome].[Pubmed: 22803388]

Through studies on morphological characteristics, distribution and ecological habitat described in ancient literatures, Osmunda japonica is believed to the original plant of Chinese herbal medicine Cyrtomium Rhizome. Meanwhile, analysis is also made on causes for descriptions that do not comply with characteristics of O. japonica such as toxicity, flowers and fruits, illustrations, indumentums and flakes as well as appearance of other original plants. It is suggested to list O. japonica as the only original plant of Cyrtomium Rhizome and distinguish it from other frequently seen medical plants. Separated studies are also conducted for pesticide effect and active ingredients of Dryoteris Crassrhizomae Rhizome and Woodwardia japonica that show better effects.

[Speciation analysis of cadmium in cadmium-enriched plants with SE-HPLC combined with ICP-MS and ESI-MS].[Pubmed: 20545169]

Different species of ferns (pyrrosia lingua, Lepisorus thunbergianus, Lycopodium japonicum, Elaphoglossum yoshinagae and Woodwardia japonica) were cultivated using different species of cadmium as cultivation solution. The results showed that there were differences in enrichment amounts of cadmium in different parts of plants (amounts in root > in stem > in leaves). And it was found that different species of cadmium could induce synthesization of plant--chelated peptides (PCs) with different extents. And then PCs was coordinated with cadmium to decrease the toxicity from cadmium. There are some kinds of peptides ligands found in plants, which are mainly PC3, iso-PC3(betaAla) and iso-PC2(betaAla). In the present paper, the distribution of cadmium in different parts of ferns was studied after the ferns were intimidated with different species of cadmium. And the species of PCs-Cd coordination compounds were also investigated to explain the detoxification mechanism aroused by it.

[Decomposition interaction of mixed litter between Chinese fir and various accompanying plant species].[Pubmed: 11758404]

Studies on the decomposition of mixed litter between Chinese fir and 8 accompanying plant species showed that the decomposition of Chinese fir litter was promoted to different degrees by 8 mixed plant species, in which Angiopteris fokiensis had the greatest effect, while Schima superba had certain promotion first, but then, weak inhibition. The order of promotion was Angiopteris fokiensis > Maesa japonica > Ficus simplicissima > Woodwardia japonica > Boehmeria nivea > Castanopsis fargesii > Castanopsis fissa > Dicranopteris dicotoma. Chinese fir litter had a certain inhibition to litter decomposition of Schima superba and Castanopsis fissa, and certain promotion to litter decomposition of Castanopsis fargesii, but the interactions were not significant. There existed an interaction between Chinese fir and some plant species in the course of mixed decomposition. Therefore, rational protection and restoration of understory plant was important to fasten nutrient cycling of Chinese fir plantation ecosystem and to maintain soil fertility.