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Analyzing the ecological benefits from different land utilization ways comparatively, by means of the evaluation of ecological service value, set a strong fulcrum for choosing rational land utilization way, and became the key point in land use pattern at present, especially in local scale. Therefore, by taking Shapingba district of Chongqing city as an example and rectifying the coefficient of ecological...
Soil microbial biomass carbon (Cmic), soil basic respiration and soil enzyme activities are the most important biological indicators of soil quality. The effects of single and combined pollution of cadmium (Cd 20mg/kg) and phenanthrene (Phe 50mg/kg) on these biological indicators were investigated in this study under the laboratory incubation conditions. The results showed that the level of Cmic and...
This paper is to analyze the modes of Sino-Vietnamese biofuel co-operations in a globalizing world. With more and more countries establishing their policy on renewable energy, the biofuel industry becomes a prospective one and transnational biofuel cooperation is needed. We need to find some typical modes of biofuel cooperation and to know what will influence the future cooperation as well as to know...
Microbial flocculant (MBF) was extracted from waste yeast and used as a sludge conditioner with nano SiO2 particles. The effects of the new composite material on sludge dewatering characteristics were investigated. The equivalent concentration of MBF was defined as the mole number of adsorbed Cu2+ per volume solution. An equivalent concentration of 712 µmol/L MBF can be extracted under optimal conditions...
The removal of cadmium (II), onto agricultural waste biomass carya shell (CS) over a wide range of reaction conditions was studied from aqueous solution. These conditions including the effect of solution pH, initial concentration, contact time on sorption efficiency. The cadmium (II) adsorption was favored with maximum adsorption at pH 7.0. The uptake amount of cadmium (II) onto CS was increased with...
The paper firstly briefly introduces the remote sensing investigation in vegetation and wetlands, preprocessing procedure of remote sensing image in the natural resources monitoring, and the commonly-used extraction methods of wetland vegetation information. In addition, the paper discusses the research status of the remote sensing inversion model, and elaborates on the three commonly-used models:...
In order to realize the sustainable development and utilization of woody biomass energy resources in Henan province of China, the authors constructed a fitting evaluating system depending on the sustainable development theory and the regionally practical condition there. This system was constructed by three subsystems, six criterion layers and thirty two evaluated indexes belonging to these different...
This paper according to problems existed in improper data processing and closed error contained in the model when building models with logarithmic, power function and hyperbolic function; In precision estimation of growing stock volume, there is no scientific model for precision estimation; to address these problems, the paper would research volume model parameters based on nonlinear least square...
Terrestrial distribution with soil bacteria, fungi and actinomycetes amount of the Xilin River natural wetland was investigated. The result that soil microbial community compositions of typical grasslands and natural wetlands, with the elevation changes gradually reduce the soil moisture content from bed sludge (HX) to typical steppe (DT), changed significantly. The total microbial and aerobic bacteria...
Pot experiments were conducted to investigate the effects of three different chelating agents(EDTA, citric acid, NTA) that intensify the absorption and accumulation of Cu, Zn in vermicompost for Euchlaena Mexicana Schrad. The results indicated that chelating agents addition could inhibit the growth of Euchlaena Mexicana Schrad, and the inhibition on the roots is greater than the shoots. At the same...
The physical characteristics, ignition performance and combustion characteristic of SDBF were analyzed in this paper. It indicates that the physical of SDBF is close to the coal in density, Calorific value and other aspects. The ignition performance has the tendency to biomass straw, but the ignition temperature became higher than the straw. The combustion characteristic is about the same like coal,...
Under submerged incubation with different herbicides (Quinclorac, Pyrazosulfuron) dynamics of soil microbial activity and biochemical characteristic in a waterlogged paddy soil were studied. Show soil basal respiration was significantly enhanced during the training besides at first day. soil microbial biomass carbon and nitrogen were significantly control, however, soil microbial phosphorus was enhanced‥
The community of wasteland, secondly shrub, Pinus yunnanensis forest, Alnus nepalensis forest, mature Pinus armandii forest, half-Mature Pinus armandii forest and mixed forest were selected to analyze the carbon-sink function by establishing recursive trees regression biomass model with different components contain the biomass of forest, stick defoliation reserves and soil carbon. It is indicated...
Remote-sensing technology has special advantages in estimating forest carbon storage and biomass on the ground. The paper summarizes three main methods of estimating forest carbon storage by using remote-sensing technology, namely, multielement regression analytical method, artificial neural network method and mathematical modeling method. Also the advantages and disadvantages of each method are explained...
A novel swimming bed reactor with no reflux which suit for small scale wastewater treatment was developed. The performance of the reactor for treating domestic wastewater was investigated. Steady removal effect with 71.75% of average COD removal rate was achieved in hydraulic retention times (HRT) of 20.74h ∼ 4.30h. When hydraulic retention time (HRT) was at 8.12h with average NH4+-N volumetric loading...
Water is one of the primary factors limiting terrestrial biological activity, particularly in arid and semi-arid regions. This study focuses on the temporal and spatial variation between vegetation green biomass and precipitation parameters, namely annual precipitation (AP), annual effective precipitation (AEP), annual precipitation uniformity (APU) and growing season precipitation (GSP), in northern...
It is significant for its water pollution control and estimation of wet land biomass to fast acquire space-time variation information of Dongping lake. This paper mainly researches the relative technologies of monitoring information on the variation of chlorophyll a concentrations using HJ-1A/1B image, such as, massive data auto- filter, image automatic preprocessing, chlorophyll a concentrations...
Remediation of contaminated sites through conventional methods is expensive and often applicated to small areas. Phytoremediation (using plants) may be superior to those methods. I. lactea var. chinensis (Iris lactea Pall. var. chinensis (Fisch.) Koidz.), a promising plant for phytoremediation, is usually considered not only tolerant to plant diseases and insect pests but also to cold, drought, shade,...
Surface soil samples (0∼20cm) were collected from a Calamagrostis angustifolia freshwater marsh in the Sanjiang Plain from May to September and soil active organic carbon including microbial biomass carbon (MBC), easily oxidizable carbon (EOC), dissolved organic carbon (DOC) were analyzed aiming to reveal their seasonal dynamics characterisitics and their correlationships with activities of soil invertase,...
Shenhua coal is difficult to form slurry of high concentration, low viscosity for its strong hydrophilicity. Based on that, coal water slurry (CWS) additive, denoted as LS-A, was used to prepare Shenhua coal blending slurry with high concentration, and then the slurry ability, rheological characteristic and static stability of LS-A were investigated. The results show that, the performances of CWS...
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