Biomedical subjects

Ji Ye

Publications and source records attributed to Ji Ye.

5 recordsLinked to original sources

PubMed2006

[Effects of bryophytes in dark coniferous forest of Changbai Mountains on three conifers seed germination and seedling growth].

This paper studied the effects of Hylocomium splendens and Rhytidiadelphus triquetrus, the main bryophytes in dark coniferous forests of Changbai Mountains, on the seed germination and seedling growth of Pinus koraiensis, Picea koraiensis and Larix olgensis. The results indicated that at definite concentrations, the water extract of H. splendens inhibited Picea koraiensis seed germination, while that of R. triquetrus promoted it. Although the water extracts of the two bryophytes had no obvious effects on the seed germination of Picea koraiensis and Larix olgensis, they expedited the occurrence of the tree species' daily germination peak. The water extracts of test bryophytes inhibited the seedling growth of P. koraiensis and Picea koraiensis, but promoted that of Larix olgensis. The living shoots of the two bryophytes had no obvious effects on the seed germination of Picea koraiensis and Larix olgensis, but delayed the daily germination peak of Picea koraiensis while promoted that of Larix olgensis, andthe killed shoots inhibited the seed germination of all test tree species. Living shoots in larger amounts promoted the seedling growth of Picea koraiensis and Larix olgensis, but killed shoots were inadverse.

Bryophyta↗

PubMed2005

[Roles of bryophyte in nutrient cycling in dark coniferous forest of Changbai Mountains].

This paper measured the nutrient contents of five main bryophytes in the dark coniferous forest of Changbai Mountains, and estimated their values per unit area. The results showed that bryophyte had a nitrogen content 54.371 kg x hm(-2), being 12.22% of total nitrogen content of arbor, shrub and herb, and its potassium and phosphorous content was 12.042 kg x hm(-2) and 31.679 kg x hm(-2), occupying 5.63% and 70.57% of the total, respectively. The phosphorous content of bryophyte was higher than that of arbor, and 2.4 and 792 times as much as that of herb and shrub, respectively, indicating that bryophyte was an important phosphorous pool. Soil nitrogen and potassium content under different coverage of bryophyte had little difference, while soil phosphorous content was significantly different. The soil with no bryophyte coverage had the highest phosphorous content (0.419 +/- 0.023 g x kg(-1)), while that with 80%-100% bryophyte coverage had the lowest one (0.346 +/- 0.017 g x kg(-1)), suggesting that soil phosphorous content was decreased with increasing bryophyte coverage.

Bryophyta↗

PubMed2004

[Bryophyte biomass in dark coniferous forest of Changbai Mountain].

In this paper, the floor and epiphytic bryophyte biomass was sampled from the dark coniferous forest on the north slope of Changbai Mountain, with an altitude from 1100 m to 1700 m. The floor bryophyte biomass was measured by the method of transect sampling, and epiphytic bryophyte biomass was measured by McCune method. The results showed that bryophytes distributed unevenly, and their biomass changed greatly with increasing altitude. The biomass was the least (543 kg x hm(-2)) at 1100 m, but the greatest (5097 kg x hm(-2)) at 1250 m. The changes of bryophytes biomass could indicate different environmental situations. The biomass change of Hylocomium splendens and Rhytidiadelphus triquetrus with ascending altitude had some relativity with the community character of forest ecosystem. The biomass of Hylocomium splendens increased, but that of Rhytidiadelphus triquetrus decreased with altitude ascending from 1100 m to 1700 m. Moreover, the biomass changes could also show the needed physiological conditions of different bryophytes.

Altitude↗

PubMed2004

[Utilization suitability of forest resources in typical forest zone of Changbai Mountains].

Conservation of natural forest does not simply equal to no logging. The Northeast China Forest Region has a logging quota of mature forest as part of natural forest conservation project. How to determine the logging spots rationally and scientifically is very important. Recent scientific theories of forest resources management advocate that the utilization of forest resources should stick to the principle of sustaining use, and pay attention to the ecological function of forest resources. According to the logging standards, RS and GIS techniques can be used to detect the precise location of forest resources and obtain information of forest areas and types, and thus, provide more rational and scientific support for space choice about future utilization of forest resources. In this paper, the Lushuihe Forest Bureau was selected as a typical case in Changbai Mountains Forest Region to assess the utilization conditions of forest resources, and some advices on spatial choice for future management of forest resources in the study area were offered.

China↗

PubMed2004

[Research advances in bryophyte ecological function].

Though the body of bryophyte is small, its species is abundant (about 23,000), being an important part of biodiversity. The previous studies were focused on its taxology, while its ecological functions in ecosystem were ignored. Bryophyte can adapt to various environments, distribute in many extreme surroundings, and has rebuilding ability to environments. It has a very strong ability of holding and absorbing water, especially the epiphytic bryophyte can intercept a great deal of rain, and its function in water circulation is very obvious. Bryophyte can absorb a lot of nutrient elements by body surface, but its function in nutrient cycling was usually ignored. In some extreme environments, bryophyte is the important primary producer. Sphagnum biomass is more enormous, and maybe, is the important C pool. Bryophyte can sensitively response to the air and heavy metal pollution, and is a kind of bio-indicators. In order to promote the further studies on bryophyte ecological function, the related research advances were reviewed in this paper.

Biodiversity↗