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Weathering of Carbonate Rocks by Biological Soil Crusts in Karst Areas

Journal of Earth Science 2014年第4期25卷 662-667页

作者： Ye Chen Bin Lian zuoying yin Yuan Tang Key Laboratory of Karst Environment and Geological Hazard Prevention School of Chemistry and Chemical EngineeringGuizhou University Jiangsu Key Laboratory for Microbes and Functional Genomics Jiangsu Engineering and Technology Research Center for Microbiology College of Life Science Nanjing Normal University Puding Karst Ecosystem Research Station State Key Laboratory of Environmental GeochemistryInstitute of GeochemistryChinese Academy of Sciences

The weathering of carbonate rocks by biological soil crusts （BSC） in karst areas is very common. It is helpful to understand the weathering mechanisms and processes for avoiding karst rock-desertification. The weathering of carbonate rocks by BSC in karst areas, namely the expansion, contraction and curl resulting from environmental wetting-drying cycles, was investigated and ana- lyzed in this paper. The bulk density, area and thickness of BSC were determined and the weathering amount of limestone and dolomite per unit area of BSC was calculated as 3 700 and 3 400 g·m-2; the amount of biomass on the surface of limestone and dolomite was calculated as 1 146 and 1 301 g·m-2, respectively. Such an increased weathering amount was not only the result of chemical and physical weathering of BSC on carbonate rocks, but also the attachment and cementation of BSC to clay particles, dust-fall, sand particles, solid particles brought by strong air currents, wind and other factors in the surrounding environment, which may also be related to the special environment and the special time period. Based on the results obtained, a weathering mode of BSC is studied, and the mechanisms of weathering by BSC are discussed. In conclusion, we suggest that the mechanical force exerted by the expansion and constriction of gelatinous and mucilaginous substances through wetting and drying of BSC play a significant role in the physical weathering process of the carbonate substrates.

关键词： biological soil crust dolomite limestone weathering amount biomass.

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Relationship between fluorescence characteristics and molecular weight distribution of natural dissolved organic matter in Lake Hongfeng and Lake Baihua,China

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Chinese Science Bulletin 2006年第1期51卷 89-96页

作者： YUE Lanxiu WU Fengchang LiU Congqiang LI Wen FU Pingqing BAI yingchen WANG Liying yin zuoying Lü Zhicheng State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Shougang Institute of Technology Beijing 100041 China

Dissolved organic matter (DOM) is one of the most interesting and difficult problems in recent years due to its important functions in the ecological and environmental system and the complexity of its chemical composition and structure. It is well ac- cepted that fluorescence characteristics and mo- lecular weight distribution are two important pa- rameters in the DOM characterization. However, the relationship between them is still unknown. In this study, fluorescence and molecular weight distribution of DOM in Lake Hongfeng, Lake Baihua and their rivers, and their relationship were investigated using the combination of fluorescence spectroscopy and high-performance size exclusion chromatography (HPSEC) with on-line UV absorbance and fluores- cence detectors. The results show that there were two obvious humic-like fluorescence peaks (Peaks A and B) in DOM from lake water. But there was an- other obvious protein-like fluorescence peak (Peak C) in DOM from river water. The humic-like fluorescence material consisted of DOM fraction with smaller mo- lecular weight, ranging from 1.0 to 3.0 kDa, while the protein-like fluorescence material mainly consisted of DOM fraction with MW larger than 2.0 kDa. The cal- culation of MW using HPSEC was related to the UV absorbance wavelength chosen.

关键词：荧光性能分子量色谱分析溶解有机物湖泊吸光度

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工业炉燃料转换天然气的实践

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工业炉 2018年第4期40卷 38-40页

作者：刘雪喜殷晓飞李作营第一拖拉机股份有限公司

论述了第一拖拉机股份有限公司工业炉天然气切换的设计过程,以及在切换改造中采用的先进技术和设备实现节能减排、提高产品质量的成果。

关键词：工业炉天然气切换先进技术和设备节能减排

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《慧琳音义》慧琳案语探析

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唐山师范学院学报 2014年第6期36卷 21-26页

作者：左莹莹河南大学文学院河南开封475000

慧琳的《一切经音义》是我国唐代一部集诸家训释佛经音义之大成的佛典文献。慧琳案语是其重要组成部分,其内容丰富、涉及面广,涵盖了宗教、哲学、语言、文学、艺术、中外交往史等社会文化的方方面面,在文献学、语言学和传统文化研究等... 详细信息

慧琳的《一切经音义》是我国唐代一部集诸家训释佛经音义之大成的佛典文献。慧琳案语是其重要组成部分,其内容丰富、涉及面广,涵盖了宗教、哲学、语言、文学、艺术、中外交往史等社会文化的方方面面,在文献学、语言学和传统文化研究等方面都具有重要的学术价值。

关键词：慧琳音义慧琳案语研究价值

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优质高产桑树新品种川桑7431的育成

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激光生物学报 2013年第1期22卷 58-63页

作者：刘刚黄盖群殷浩佟万红危玲郑继川姚永权任作瑛四川省农业科学院蚕业研究所四川南充637000

以苍溪49×6031人工杂交桑种子为材料,采用秋水仙碱和60Co-γ射线复合诱变,从诱变群体中选择出优良单株培育成优质、高产桑树新品种川桑7431,新品种经四川省桑品种区域性鉴定和农村生产试验表明:新品种川桑7431具有生长势旺、叶片大而... 详细信息

以苍溪49×6031人工杂交桑种子为材料,采用秋水仙碱和60Co-γ射线复合诱变,从诱变群体中选择出优良单株培育成优质、高产桑树新品种川桑7431,新品种经四川省桑品种区域性鉴定和农村生产试验表明:新品种川桑7431具有生长势旺、叶片大而厚、节间密、高产、优质、遗传性状稳定等特点。全年平均产叶量33034.25 kg/hm2,比对照湖桑32号增产20.26%。用该品种桑叶养蚕的试验成绩为:万蚕收茧量19.56 kg,万蚕茧层量4.61 kg,5龄50 kg桑产茧量3.75 kg,分别比对照湖桑32号提高10.37%、10.43%、8.32%。秋叶硬化迟。新品种适合在四川省的平坝、丘陵、特别是容易发生干旱的蚕区栽植。

关键词：桑树品种化学诱导辐射诱变川桑7431

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