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organic substrate Application in Vegetable Seedling Raising in China

Agricultural Science & Technology 2017年第2期18卷 353-356页

作者：由海霞于立芝鄂尔多斯市经济作物工作站内蒙古鄂尔多斯017000 中国农业大学烟台研究院山东烟台264670

To study the organic substrates substitution for turf has certain significances and has become a hot research topic. The sources of organic substrates mainly concentrate in organic waste of agriculture and forestry, animal husbandry industrial wastes and municipal sludge and so on in China. In order to better explore and utilize organic substrates resources, the authors summed up the application of organic substrates of different sources to vegetable seedling raising. The re- sults showed that the organic substrate produced by traditional and advanced tech- nology had the characteristics of stability, strong buffer capacity, comprehensive nu- trition and a good environment for root growth, which could reduce the production cost, cultivate high quality seedling and benefit cyclic utilization of resources, and replace or partly replace the turf. The prospects for future research direction were discussed to provide references for research and development on organic vegetable seedling raising technology in China.

关键词： organic substrate Vegetable Seedling raising Research progress

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Araucaria angustifolia Aboveground Roots Presented High Arbuscular Mycorrhizal Fungal Colonization and Diversity in the Brazilian Atlantic Forest

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Pedosphere 2016年第4期26卷 561-566页

作者： Milene MOREIRA Maria I. ZUCCHI Jose E. GOMES Siu M. TSAI Alessandro ALVES-PEREIRA Elke J. B. N. CARDOSO Sao Paulo State Agency for Agribusiness Technology CP 28 Piracicaba 13400-970 Center for Nuclear Energy in Agriculture University of Sao Paulo Piracieaba 13416-000 Genetics Department Luiz de Queiroz College of Agriculture University of Sao Paulo Piraeieaba 13418-900 Soil Science Department Luiz de Queiroz College of Agriculture University of Sao Paulo Piracicaba 13418-900

30 different arbuscular mycorrhizal fungi （AMF） species, distributed in different genera such as Glomus, Acaulospora, Scutellospora, Entrophospora, Ambisporu, Kuklospora, Gigaspora, and Archeospora, have been identified in the root zone of Araucaria angustifolia, known as Brazil Pine. During our AMF survey in this ecosystem, our attention was called to the presence of many superficially growing Araucaria roots. Our hypothesis was that these roots were colonized with AMF because of the presence of AMF spores in organic material aboveground. Samples of these superficial roots and the organic substrate they were growing on were evaluated for their mycorrhizal status. DNA was extracted from the AMF-colonized superficial roots and submitted to polymerase chain reaction （PCR） amplification using the NS31-AM1 primer pair, followed by cloning and sequencing. We found that the root colonization percentages were between 31% and 52%, and the number of AMF spores in the substrate ranged from 27 to 164 spores per 50 g dry substrate. The phylogenetic analyses and tree construction using maximum parsimony （MP） and neighbor-joining （N J） methods identified 13 different species of the phylum Glomeromycota belonging to the genera Glomus, Funneliformis, Rhizophagus, Gigaspora, Acaulospora, and Archaeospora, and five isolates were identified only at the genus level. To our knowledge, this is the first report on Araucaria angustifolia with roots growing aboveground, producing runner roots that develop on dead tree trunks and organic material. The higher colonization of the aboveground roots than those commonly found in belowground Araucaria roots suggests that they may present active metabolic uptake of nutrients.

关键词： AMF spores fungal taxonomy mycorrhizal status nutrient uptake organic substrate root colonization superficial roots

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Competition for Single Carbon Source Between Denitrification and Phosphorus Release in Sludge under Anoxic Condition

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Chinese Journal of Chemical Engineering 2010年第3期18卷 472-477页

作者：彭赵旭彭永臻桂丽娟刘旭亮 School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China College of Environment and Energy Engineering Beijing Institute of Technology Beijing 100022 China

In order to investigate the competition for carbon source between denitrification and phosphorus release processes,simultaneous phosphorus release and denitrification in sludge operated in anoxic,aerobic mode are investigated by varying the ratio of influent COD to nitrogenous compound concentration under anoxic condition using a lab-scale sequencing batch reactor（SBR）.The results show that the nitrate reduction rate is nearly independent of the ratio of influent COD to nitrate under anoxic *** NOx^--N in the influent leads to less PO4^3--P release during the feeding ***, PO4^3--P release proceeds at a low rate simultaneously with denitrification even when the influent NOx^--N concentration is as large as 20 mg·L^-1and its rate is increased obviously when NOx^--N is denitrified to a concentration lower than 0.5 mg·L^-*** variation of pH during anoxic period gives some information about the biochemical reactions of denitrification and PO4^3--P *** more nitrate is present in the influent,more acetate uptake in feeding period is used for direct microorganism growth.

关键词： denitrification SBR phosphorus release pH organic substrate

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