Biomedical subjects

Hongbing Deng

Publications and source records attributed to Hongbing Deng.

16 recordsLinked to original sources

PubMed2005

[Assessing forest ecosystem health II. A case study].

On the bases of samples investment and related data collected by others, and with the method of health distance assessment and the ecosystem health index system of Korean pine and broad-leaved mixed forest established in prior paper, this paper attempted to assess the ecosystem health of Korean pine and broad-leaved mixed forest under various human disturbances. The results showed that the health degree was in the order of 20% intensity selective cutting stand (0.21) < 50% intensity selective cutting stand (0.44) < middle and mature birch stand (0.67) < youth birch stand (0.72) < Korean pine plantation (0.74) < larch plantation (0.77).

Biomass↗

PubMed2005

[Analysis on the role and endowment of virtual water in agricultural ecosystem].

Water is one of the most important components of agricultural ecosystem, and also a source of food security, which plays an essential role in ensuring sustainable food resources for a growing population. In this study, the policy relevancy of virtual water was addressed, with food production, alternative trend of import, and product condition analyzed. The results showed that an average of 10.2 x 10(9) m3 water and 27.7 x 10(6) hm2 land was transferred by imported wheat, while an average of 0.3 x 10(9) m3 water and 1.6 x 10(6) hm2 land was transferred by imported maize. The sum of virtual water equivalent was 10.5 x 10(9) m3. It's of significance to alleviate the pressure of water stress in agriculture and arable land, help to resolve water predication of food production by food imports, and compensate water endowment.

Agriculture↗

PubMed2004

[Assessing forest ecosystem health I. Model, method, and index system].

Ecosystem health assessment is one of the main researches and urgent tasks of ecosystem science in 21st century. An operational definition on ecosystem health and an all-sided, simple, easy operational and standard index system, which are the foundation of assessment on ecosystem health, are necessary in obtaining a simple and applicable assessment theory and method of ecosystem health. Taking the Korean pine and broadleaved mixed forest ecosystem as an example, an originally creative idea on ecosystem health was put forward in this paper based on the idea of mode ecosystem set and the idea of forest ecosystem health, together with its assessment. This creative idea can help understand what ecosystem health is. Finally, a formula was deduced based on a new effective health assessment method--health distance (HD), which is the first time to be brought forward in China. At the same time, aiming at it's characteristics by status understanding and material health questions, a health index system of Korean pine and broadleaved mixed forest ecosystem was put forward in this paper, which is a compound ecosystem based on the compound properties of nature, economy and society. It is concrete enough to measure sub-index, so it is the foundation to assess ecosystem health of Korean pine and broadleaved mixed forest in next researches.

Ecosystem↗

PubMed2004

[Structure characteristics and health distance assessment of various disturbed communities of Korean pine and broadleaved mixed forest in Changbai Mountains].

Through samples investigation, this paper analyzed and classified the community structures of overcutting original forests, secondary birch forests and larch plantation forest under different disturbances. At the same time, some indexes which can reflect the integrity and stability of stand structure were selected. Health Distance (HD) method, a new idea, was attempted to assess ecosystem health of Korean pine and broadleaved mixed forest in Changbai Mountains. The results showed that the health degree was in order of original broadleaved stand (0.14) < structure switched stand (0.23) < structure reserved stand (0.32) < structure destroyed stand (0.33) < heavy disturbed stand (0. 44) < secondary birch stand (0.53) < larch plantations (0.68). Hopefully, it will be a helpful reference on the restoration of Korean pine and broadleaved mixed forest and on the regional forestry sustainable development.

China↗

PubMed2004

[Vegetation biomass distribution characteristics of alpine tundra ecosystem in Changbai Mountains].

Climate change is one of the hotspots in global environment concerns, while alpine tundra ecosystem is most sensitive to global climate change. Because of the relatively small area of tundra, researches on alpine tundra ecosystem were much less. Based on the measurement of species biomass, dominant species organ biomass and vegetation biomass, this paper discussed the biomass spatial variation in alpine tundra ecosystem of Changbai Mountains. The results showed that among 43 species investigated, the first five species in biomass were Rhododendron chrysanthum (159.01 kg x hm(-2)), Vaccinium uliginosum var. alpinum (137.52 kg x hm(-2)), Vaccinium uliginosum (134.7 kg x hm(-2)), Dryas octopetala var. asiatica (131.5 kg x hm(-2)) and Salix rotundifolia (128.4 kg x hm(-2)), which were the dominant species in the alpine tundra ecosystem of Changbai Mountains. Along with increasing altitude, the ratio of below-/above-ground biomass and below-ground/total biomass gradually increased, while the vegetation biomass gradually decreased. The vegetation biomass showed a significant correlation with altitude in typical alpine tundra ecosystem of Changbai Mountains, and the average vegetation biomass was 2.21 t x hm(-2). Alpine tundra ecosystem is very important for microclimate regulation, soil improvement, water-holding, soil conservation, nutrient cycling, carbon fixation and oxygen production, and currently, it is the CO2 sink of Changbai Mountains.

Biomass↗

PubMed2003

[Discussion on freshwater ecosystem service and its evaluation index system].

The importance of freshwater ecosystem and the connotation of ecosystem service were expounded in this paper, and the insufficiency in studies on freshwater ecosystem service was pointed out. Freshwater ecosystem service cannot be fulfilled without ecosystem health, yet there is a scarcity of synthetic studies integrating freshwater ecosystem service with ecosystem health, while these studies are necessary and important. Water resources should include water capacity, water quality, water energy, and aquatic organism. Based on the new meaning of water resources, the freshwater ecosystem service and its evaluation index system were discussed, and the evaluating methods were introduced briefly. The consideration and technical course of developing studies on freshwater ecosystem service in China were also discussed.

Conservation of Natural Resources↗

PubMed2003

[Approaches for assessing forest ecosystem health].

Assessment and indicator system become the key issues in the research on ecosystem health in 21st century. Assessing forest ecosystem health gradually attach much attention because it is an important component of terrestrial ecosystem. The definition, measurement, evaluation and its management had been discussed broadly, and some theories, assessing methods and frameworks had been proposed, which provides a new concept and a serial research approaches for dealing with the crisis of terrestrial ecosystems, even the environment problems in the world. Now, the common operational models for assessing forest ecosystem health do not exist owing to the manifold limitations. This paper discussed forest ecosystem health problem, and brought forward three preconditions for assessing forest ecosystem health: 1) a clear conceptual framework; 2) adequate data sets; 3) proper research and analysis techniques. The issues of three preconditions were discussed, and the possible approaches for the assessing research on forest ecosystem health, e.g., long-term studies and environment monitoring, space-for-time substation studies, e.g., history approaches, economics valuation and others were expariated.

Ecosystem↗

PubMed2003

[Flora analysis of riparian plant communities on the northern slope of Changbai Mountain].

This study was conducted in the riparian forest of Erdaobaihe River, and the flora of riparian plant communities on the northern slope of Changbai Mountain was researched and analyzed. There were 288 vascular plant species belonging to 169 genera and 68 families, among them, 26 plant species belonging to 16 genera and 11 families were fern, and 262 plant species belonging to 153 genera and 57 families were spermatophyte. Among spermatophyte, there were 9 gymnosperm species belonging to 6 genera and 3 families and 253 angiosperm species belonging to 147 genera and 54 families. Among angiosperm, there were 212 dicotyledonous species belonging to 118 genera and 45 families and 41 monocotyledonous species belonging to 29 genera and 9 families. All the results showed that there were abundant plant species in the riparian plant communities on the northern slope of Changbai Mountain. Analyses on the distribution area types of spermatophyte in the riparian communities showed that the distribution area types of genera and families were both abundant. For genus level, there were 9 distribution area types and 7 sub-types, and for family level, there were 6 distribution area types and 2 sub-types. The riparian plant communities had a temperate characteristic, and there were 117 genera, which were accounted for 76.5% of all the genera of spermatophyte, belonging to all the different temperate distribution types. In addition, the flora of riparian communities had a complex component, and had close relations with Tropical and East Asia distribution type, but few relations with Mediterranean distribution type. The results also showed that riparian zone could play an important role in biodiversity protection.

Biodiversity↗

PubMed2003

[Application of geostatistical analysis in study of macrophytes community's pattern].

In this paper, the Log-log semivariogram and theoretical models of Geostatistics and fractal theory were applied to study the mosaic spatial pattern of macrophytes community and its different characters on different scales in littoral zone of the Baoan Lake, Hubei Province. The macrophytes in the littoral zone with a square area of 25,600 m2, which was divided in to 1,024 grids, were investigated, and the macrophytes species in every grid were recorded. If the species was discovered in the grid, the variable of the grid had a value of 1, otherwise, it was 0. The community had a value of the total species discovered in the grid. By the method, the sampling results of Vallisneria spiralis, Ceratophyllum oryzetorum, Myriophyllum spicatum and the community were made into four worksheets. With help of the software GS+ for Windows to treat these worksheets, we got their log-log semivariogram, isotropic model, anisotropic model, isotropic fractal dimension and anisotropic fractal dimension. According to the results of isotropic models, the exponential models of Vallisneria spiralis and Myriophyllum spicatum indicated their contagious distribution with a high proportion of spatial structure, which indicated that their distribution changed lesser at microscale. In their range of 48.6 m and 34.2 m respectively, they had a spatial autocorrelation. Isotropic models of Ceratophyllum oryzetorum and the community were linear, and their proportions of spatial structure were low, indicating their great change at microscale and their moderate contagious distribution. The isotropic fractal dimension and anisotropic fractal dimension results indicated the dominant pattern of Vallisneria spiralis in the direction of NE-SW, the dominant patterns of Myriophyllum spicatum and Ceratophyllum oryzetorum in the direction of N-S, and the community's dominant pattern in the direction of NW-SE. Compared with other analysis tools, the method had advantages in deciding whether the community components had a spatial autocorrelation and in quantitatively classifying the aggregation density. It provides us a new way to quantitatively describe the pattern of the macrophytes community.

Fresh Water↗

PubMed2003

[Ecological distribution of mycorrihizal fungi associated with oak in Dandong district of Liaoning Province].

With plot cruising and rout investigation methods, 36 species of ectomycorrhizal fungi associated with oaks were found in natural secondary oak forest in Dandong district of Liaoning Province. They were subordinated to 7 familyies, 13 genera. Studies on the relationship of the ecological distribution of mycorrhizal fungi with tree species, tree age and seasons showed that 29 species mycorrhizal fugi preferred to grow with Q. mongolica, The species of Russulla were associated with a wider tree ages of oak, and the species of Amanita were most likely to grow with old tree. July and August were the occurrence peak of mycorrhizal fungi. 75% species occurred in July, and 100% species occurred in August. The relative density of the occurrence number was the highest in mid-August (19.5%) and last-August (18.4%).

Ecology↗

PubMed2002

[Comparison of leaf decomposing rate in a headwater stream in Xiangxi River catchment].

With the litterbag method, the decomposition of leaf of 4 tree species growing in riparian forest in a headwater stream was investigated in 90 d consecutively in Xangxi River catchment. The results showed that the loss rate of dry weight of leaf differed among 4 species. The loss rate of dry weight of Pterocarya insignis and Cercidiphyllum japonicum was 77% and 71%, and shat of Fagus engleriana and Cyclobalanopsis multinervis was 43% and 42%. Using exponential equation, the loss process of dry weight of leaf was modeled. According to the value of constant k, 4 species could be divide into to fast group and medium group. The invertebrate was also collected, and there were 22 species, belong to 3 classes, 6 orders, and 21 families. The quantity of invertebrate differed in each tree species litterbag and different periods. The invertebrate was rich in number and small in body during early time of leaf decomposing, and it was less in number and big in body during middle and late time of decomposing.

Animals↗

PubMed2002

[Minimum sampling area and species richness of riparian community in erdaobaihe forested watershed].

Riparian zone is an important component of small forested watershed. Due to the integrate effects of stream water and edge effect, there are obvious difference in composition, structure, and distribution pattern between riparian community and non-riparian community. Community minimum sampling areas are also different. In this study, minimum sampling areas of riparian community in original broad-leaved and Korean pine forest in Changbai Mountain were studied by using species-area curve. At the same time, species richness of riparian community was discussed. The results showed that the minimum sampling areas of riparian plant community were smaller than those of the non-riparian community. According to the original broad-leaved and Korean pine forest in Changbai Mountain, the average community minimum sampling areas in riparian zone of three plots including 60%, 80%, and 90% of community species were about 80 m2, 180 m2, and 320 m2, respectively. And then, those of forest community were about 260 m2, 380 m2, and 480 m2 correspondingly. The results also showed that the species richness of riparian community was higher than that of non-riparian community.

Ecosystem↗

PubMed2002

[Assessment method of ecosystem health].

Ecosystem is the basic unit to maintain human environment. Ecosystem function mainly includes two aspects: ecosystem service function and goods function. These two functions are the basis for human living and development. Ecosystem health is the presupposition of ecosystem function. The completeness (structure and function), resilience, stability, and sustainability are the characteristics of ecosystem health. Ecosystem health assessment selects the indicator based on the ecosystem structure and function, including completeness, suitability, and effectiveness of ecosystem. Ecosystem health assessment mainly has two methods: one is indicator species assessment, and the other is structure and function index assessment which includes single index assessment, complex index assessment, and index system assessment which includes natural index system assessment and social-economic-natural index system assessment. In this paper, different assessment methods on ecosystem health are compared, and different health assessment method for different ecosystem types are also expatriated.

Ecosystem↗

PubMed2002

[On eco-ethics and sustainable development of natural resources].

In this paper, definition of natural resources was discussed at first, and chief characteristics of natural resources were concluded and summarized systematically. Then, in point of eco-ethics, relationship between natural resources and human was discussed. Human in the contemporary era should hold the responsibilities and commitments to remain abundant resources for survival and development of the offspring, and it is the same important to meet the requirement of human in the contemporary era and the offspring. Bringing eco-ethics into the practice of protection, exploitation, and sustainable development of natural resources has very important theoretic and practical significance undoubtedly. Therefore, approaches and main measures to sustainable development of natural resources were also discussed in this paper.

Ecology↗

PubMed2002

[Lake ecosystem services and their ecological valuation--a case study of Baoan Lake in Hubei province].

Along with the maturation of estimation methods for biological resources, the studies on the services value of ecosystem become a hotspot in ecology. The studies on the services value of lake ecosystem were not been reported before this issue, and this issue firstly attempted to estimate the Baoan Lake ecosystem services and its indirect economic values on the basis of ecological function analysis and some economic methods. The results showed that the indirect economic value (in RMB) of organic matter production, CO2 fixation, O2 release, nutrient recycling, water conservancy and water supply and SO2 degradation were 1.51 x 10(7), 4.77 x 10(7), 3.63 x 10(7), 4.45 x 10(5), 1.10 x 10(8), 5.15 x 10(5) yuan.yr-1, respectively. The sum was about 2.24 x 10(8) yuan.yr-1. From the above incomplete estimation, it was known that the Baoan Lake ecosystem has great ecological and economic values.

Animals↗

PubMed2002

[Distribution pattern of rare plants along riparian zone and its implication for conservation in Shennongjia area].

Due to the importance of riparian zone in maintaining and protecting regional biodiversity, more and more ecologists paid their attentions to riparian zone, and had been aware of the important effects of riparian zone in basic study and practical management. In this study, forty sampling belts (10 m x 100 m) parallel to the bank of Xiangxi River at different elevations in Shennongjia area were selected to investigate the riparian vegetation and rare plants. Fourteen species of rare plants were found in riparian zone, accounting for 42.4% of total rare plant species in Shennongjia area. The main distribution range of the fourteen rare plant species was the mixed evergreen and deciduous broadleaved forest at elevation of 1200-1800 m, where species diversity of plant community was the maximum at the moderate elevation. Fourteen rare plant species could be divided into three groups against the elevation, namely low elevation species group, moderate elevation species group, and high elevation group. In the paper, the authors discussed the reasons forming the distribution pattern of rare plant species, and pointed out the important function of riparian zone on rare plant species protection.

China↗