Long H.,Beijing Normal University |
Long H.,Beijing Academy of Agriculture and Forestry Sciences |
Li X.,Beijing Normal University |
Wang H.,Beijing Normal University |
Jia J.,China Rural Technology Development Center
Renewable and Sustainable Energy Reviews | Year: 2013
Biomass and bioenergy potential estimation has been worldwide research highlights in renewable energy field to get comprehensive understand of bioenergy development, especially under the situation of energy crisis. This paper reviews the results of previous studies that investigated biomass resources and their bioenergy potential estimation. It is organized from the perspectives of traditional vs. newly-introduced approaches and present vs. future. First, according to the methods used in relative studies, existing studies were divided into two categories: statistical data based and RS-GIS based. Second, concerning about the future of bioenergy, biomass and bioenergy potential estimation under different scenarios in the future were also reviewed and summarized according to the dominant factor considered in simulation. At last, based on the reviews above, questions and the future of bioenergy potential estimation were proposed so as to provide some instructions for bioenergy development. © 2013 Elsevier Ltd.
Chen Z.,Beijing Normal University |
Gao B.,Beijing Academy of Agriculture and Forestry Sciences
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing | Year: 2014
Airborne Lidar (Light detection and ranging) data have been widely used for classifying different land cover types. However, few researchers have conducted urban land cover classification using discrete airborne Lidar data as the sole data source. This research explores the possibility of applying airborne Lidar data to land cover classification in urban areas. The elevation difference and intensity difference between the first and last return, which may not work efficiently in pixel-based classification, were employed as two key attributes at the object level. Since tree objects have a much larger proportion of returns which show the elevation and intensity difference, the two indicators were used to classify the most indistinguishable land cover types, buildings and trees. In addition, height and intensity information were integrated to classify other land cover types. A case study was conducted in the city of Cambridge and eight urban land cover types were classified with an overall accuracy of 93.6%. Each land cover type was classified with an accuracy of between 80% and 100% and among these types, the accuracy of more than 90% for trees and buildings was satisfactory. © 2014 IEEE.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: SFS-05-2015 | Award Amount: 5.14M | Year: 2016
The main objective of GoodBerry is to provide the necessary knowledge and procedures to facilitate the development of highly productive and top quality berry fruits, even under multiple suboptimal growth conditions, at a competitive cost. The project is based on an integrative multi-actor approach, from cultivation techniques to molecular studies, aiming the development and validation of a range of tools to improve competitiveness of European berry production, and eventually the attraction and confidence of consumers. The selection of the model species can be considered as strategic since strawberry is the most important berry crop in Europe and the production of raspberry and blackcurrant are increasing strongly in recent years. The project will apply the most recent technical advances in: a) The identification of berry germplasm exhibiting advantageous balance of production vs nutritional quality throughout the EU, b) The search of innovative production systems to maintain high yield in a range of European-wide environments, c) The development of standardized and reliable analytical tools to evaluate berry production and fruit quality. As result, it is expected: a) the implementation of modern breeding strategies to accelerate the release of new berry cultivars; b) The adoption by EU-growers of high quality production systems to improve fruit quality. The proposal establishes as obligatory to disseminate and communicate the results to the scientific community, industry, the broad public and interested stakeholders user. The final impact will be to consolidate the emerging needs of high-quality berries, and to boost consumer and market confidence supported by an improved competitiveness of producers. It is a multidisciplinary, collaborative project based on complementary expertise and skills of internationally recognized berry research institutions, and highly involved key berry SMEs that will combine their effort to secure the robustness of the results.
Liu Y.,Beijing Technology and Business University |
Hu X.,China Agricultural University |
Zhao X.,Beijing Academy of Agriculture and Forestry Sciences |
Song H.,Beijing Technology and Business University
Innovative Food Science and Emerging Technologies | Year: 2012
The aim of this study was to investigate the combined effect of high pressure carbon dioxide (HPCD) and mild heat treatment on the overall quality of watermelon juice. The residual activity of polyphenoloxidase (PPO), peroxidase (POD), and pectin methylesterase (PME) decreased with pressure and treatment time after HPCD and heat treatment. The total color difference (E) value was greater than 3.5, suggesting the significant change of color. Browning degree (BD) decreased with pressure and treatment time; pH and lycopene content of HPCD-treated juice slightly decreased; cloudiness and titratable acidity (TA) increased; and viscosity of 10 and 20 MPa treated juice at 31.62 1 s - 1 did not change. While after control treatment, the residual activity of enzymes and BD decreased slightly; cloudiness decreased greatly; pH, TA, lycopene content, and color were stable. HPCD and mild heat treatment inactivated enzyme activities drastically which affected the shelf life and quality of watermelon juice greatly during storage. And it increased cloudy stability that was the important parameter to influence appearance of juice. Overall, HPCD treatment has greater advantages to maintain the quality of watermelon juice. Industrial relevance: The application of high pressure carbon dioxide (HPCD) processing on several food products has already been proven to be successful for pasteurization. HPCD processing to inactivate endogenous enzymes and retain quality of food needs to be further studied. Studies dealing with the combination effect of pressure and mild heat conditions on enzyme activities and quality parameters are relevant to understand the prospects for watermelon juice processing. © 2011 Elsevier Ltd.
Zang J.,China Agricultural University |
Wang D.,Beijing Academy of Agriculture and Forestry Sciences |
Zhao G.,China Agricultural University
Trends in Food Science and Technology | Year: 2013
Onion and garlic are two important vegetables in the world, which are processed in various forms such as powder, puree, and minced paste. During processing, discoloration is a major concern because it limits commercial utilization. Recently, the mechanism of the discoloration has gained a particular scientific interest, and a great progress has been made in this field. It is concluded that a greater knowledge of these areas would lend to the development of more efficient methods of controlling the discoloration. Future outlooks are highlighted with the aim to suggest a research line to follow for further studies. © 2013 Elsevier Ltd.
Wang X.M.,Beijing Academy of Agriculture and Forestry Sciences |
Wang J.L.,Tsinghua University
International Journal of Environmental Science and Technology | Year: 2012
A considerable increase in nitrate concentration in groundwater has been observed in many countries. This research focuses on nitrate removal using biodegradable snack ware (BSW) as both carbon source and biofilm support for denitrifiers. The denitrification efficiency of a laboratory-scale denitrification reactor packed with BSW was examined in a low-temperature condition. The nitrate removal efficiency supported by BSW decreased to approximately 40% at 12°C from nearly 100% at 25°C with 50 mg/L of nitrate-nitrogen in the influent and 2 h of hydraulic retention time (HRT). The complete nitrate removal was obtained when nitrate-nitrogen concentration was no more than 15 mg/L at 2 h of HRT and at 12°C. If the initial concentration of nitrate-nitrogen was 50 mg/L, 5 h of HRT was needed for the complete nitrate removal. Nitrite concentration in the treated water decreased evidently as HRT was increased from 2 to 5 h, or as nitratenitrogen concentration in the influent decreased to 15 mg/L from 50 mg/L. It was observed that varying HRT and nitrate concentration in the influent had no noticeable effect on dissolved organic carbon content in the effluent under the experimental conditions. This study indicated that the complete nitrate removal could be achieved readily even at 12°C using BSW as carbon source by changing HRT or the initial concentration of nitrate in the influent, which has some useful implications in environmental engineering practice. © CEERS, IAU 2011.
Du L.,Beijing Academy of Agriculture and Forestry Sciences |
Liu W.,Chinese Academy of Agricultural Sciences |
Liu W.,Key Laboratory of Energy Conservation
Agronomy for Sustainable Development | Year: 2012
Globally, besides human medicine, an increasing amount of antibiotics as veterinary drugs and feed additives are used annually in many countries with the rapid development of the breeding industry (livestock breeding and aquaculture). As a result, mostly ingested antibiotic doses (30-90%) and their metabolites to humans and animals, as emerging persistent contaminants, were excreted together with urine and feces, and subsequently disseminated into environmental compartments in forms of urban wastewater, biosolids, and manures. More importantly, significant amount of antibiotics and their bioactive metabolites or degradation products were introduced in agro-ecosystems through fertilization and irrigation with antibiotics-polluted manures, biosolids, sewage sludge, sediments, and water. Subsequently, accumulation and transport of antibiotics in soil-crop systems, particularly soil-vegetable systems, e.g., protected vegetable and organic vegetable production systems, poses great risks on crops, soil ecosystem, and quality of groundwater-and plant-based products. The aim of this review is to explore the sources, fates (degradation, adsorption, runoff, leaching, and crop uptake), and ecological risks of antibiotics in agroecosystems and possible food security and public health impacts. Three topics were discussed: (1) the occurrence, fates, and ecological impacts of antibiotics in agroecosystems, a global agro-ecological issue; (2) the potential ecological risks and public health threat of antibiotic pollution in soil-vegetable system, especially protected vegetable and organic vegetable production systems; and (3) the strategies of reducing the introduction, accumulation, and ecological risks of antibiotics in agro-ecosystems. To summarize, environmental contamination of antibiotics has become increasingly serious worldwide, which poses great risks in agro-ecosystems. Notably, protected vegetable and organic vegetable production systems, as public health closely related agro-ecosystems, are susceptible to antibiotic contamination. Occurrence, fate, and ecotoxicity of antibiotics in agro-ecosystems, therefore, have become most urgent issues among antibiotic environmental problems. Nowadays, source control, including reducing use and lowering environmental release through pretreatments of urban wastes and manures is a feasible way to alleviate negative impacts of antibiotics in agro-ecosystems. © INRA and Springer-Verlag, France 2011.
Li T.,CAS Research Center for Eco Environmental Sciences |
Hu Y.-J.,CAS Research Center for Eco Environmental Sciences |
Hao Z.-P.,CAS Research Center for Eco Environmental Sciences |
Li H.,CAS Research Center for Eco Environmental Sciences |
And 2 more authors.
New Phytologist | Year: 2013
Arbuscular mycorrhizal (AM) symbiosis is known to stimulate plant drought tolerance. However, the molecular basis for the direct involvement of AM fungi (AMF) in plant water relations has not been established. Two full-length aquaporin genes, namely GintAQPF1 and GintAQPF2, were cloned by rapid amplification of cDNA 5′- and 3′-ends from an AMF, Glomus intraradices. Aquaporin localization, activities and water permeability were examined by heterologous expression in yeast. Gene expression during symbiosis was also analyzed by quantitative real-time polymerase chain reaction. GintAQPF1 was localized to the plasma membrane of yeast, whereas GintAQPF2 was localized to both plasma and intracellular membranes. Transformed yeast cells exhibited a significant decrease in cell volume on hyperosmotic shock and faster protoplast bursting on hypo-osmotic shock. Polyethylene glycol (PEG) stimulated, but glycerol inhibited, the aquaporin activities. Furthermore, the expression of the two genes in arbuscule-enriched cortical cells and extraradical mycelia of maize roots was also enhanced significantly under drought stress. GintAQPF1 and GintAQPF2 are the first two functional aquaporin genes from AMF reported to date. Our data strongly support potential water transport via AMF to host plants, which leads to a better understanding of the important role of AMF in plant drought tolerance. © 2012 Research Centre for Eco-Environmental Sciences, CAS New Phytologist © 2012 New Phytologist Trust.
Yin Y.,Beijing Academy of Agriculture and Forestry Sciences
Biotechnology letters | Year: 2012
Pleurotus eryngii was transformed using a polyethylene glycol-mediated method. A plasmid, pEPUGH, containing a reporter gene (enhanced green fluorescent protein gene, egfp) and a positive selectable marker gene (hygromycin phosphotransferase gene, hph) was constructed. The fused egfp-hph gene was placed under the control of the strong and constitutive native gpd promoter from P. eryngii. The recombinant plasmid was used to transform of P. eryngii protoplasts. Successful transformation was demonstrated by molecular analyses. Moreover, the mycelia of the transformants showed green epipolic dispersion on fluorescence microscopy. About 90-210 transformants were produced per μg plasmid DNA per 10(7) viable protoplasts.
Zhou Z.,Beijing Academy of Agriculture and Forestry Sciences
Advanced Materials Research | Year: 2012
Biomass energy is an important component of household energy consumption in rural areas of China. However, under current exploitation levels, the energy source is beset with both theoretical and practical challenges, and its sustainable utilization is seriously restricted. One key to solving this problem is the establishment of a theoretical framework for the sustainable use of biomass energy by rural households. Based on the new viewpoint that biomass energy is a type of 'weakly' renewable energy, this paper provides the first theoretical basis outlining the sustainable use of biomass energy in rural households, including systems theory, the theory of ecological carrying capacity, the utility theory, the theory of ecological economics and the theory of natural resource values. The relationships among these theories are also discussed. In addition, four conditions governing the theoretical sustainable use of biomass energy by rural households are analyzed: the sustainability of the resource supply, the sustainability of biomass energy production, the sustainability of consumer acceptance, and the sustainability of ecological environmental effects. © (2012) Trans Tech Publications, Switzerland.