Preparation of La-modified magnetic composite for enhanced adsorptive removal of tetracycline

Environmental Science and Pollution Research - Composite adsorbents usually outperform single component adsorbents as they could combine the properties and advantages of each component. In this...     

Factors influencing adsorption and desorption of trimethoprim on marine sediments: mechanisms and kinetics

Environmental Science and Pollution Research - Adsorption-desorption behavior of ionic antibiotics in natural aquatic environment is complex, especially in coastal or estuary area where influencing...     

Changes of foraging patch selection and utilization by a giant panda after bamboo flowering

Environmental Science and Pollution Research - The bamboo flowering leads to the habitat fragmentation and food quality decline of a giant panda. Few empirical research has been conducted about the...     

Spatial variation and toxicity assessment for heavy metals in sediments of intertidal zone in a typical subtropical estuary (Min River) of China

Environmental Science and Pollution Research - Sediment samples were collected in five marshes (C1, Phragmites australis marsh; C2, P. australis and Cyperus malaccensis marsh; C3, C. malaccensis...     

Distribution and controls of heavy metals and organic matter in the surface sediments of the Southern Yellow Sea,China

Environmental Science and Pollution Research - Accurate and effective determination of the source of heavy metals is essential for the treatment of marine ecological environments. This article...     

Optimum ridge-to-furrow ratio in ridge-furrow mulching systems for improving water conservation in maize (Zea may L.) production

Environmental Science and Pollution Research - Water-saving cultivation techniques have been attracting increased attention worldwide. Ridge-furrow mulching system (RFMS), as a prospective...     

Microbial community composition and electricity generation in cattle manure slurry treatment using microbial fuel cells: effects of inoculum addition

Environmental Science and Pollution Research - Microbial fuel cell (MFC) is a sustainable technology to treat cattle manure slurry (CMS) for converting chemical energy to bioelectricity. In this...     

农村居民点整理对农户土地投入影响研究

近年来,农村居民点整理被作为城乡统筹发展的重要措施,在各地广泛开展。其在改善农民居住环境、为工业化和城镇化发展置换建设用地空间的同时,也对区域农地资源可持续利用产生了巨大冲击,其中,土地投入变化是农户响应这些冲击的重要表现。本研究沿着"农村居民点整理-区域土地利用条件变化-农户土地利用行为响应"的逻辑思路,形成了农村居民点整理对农户土地投入影响的分析框架,并在此基础上,从总体效应和不同政策影响两个层次,构建了农村居民点整理对农户土地投入影响的两个模型。依据江苏省调研数据,从资金和劳动力两个方面,实证分析农村居民点整理项目对农户土地投入的净效应,以及不同居民点整理政策对农户土地投入的影响方向和大小。结果表明,农村居民点整理促进了农户的土地资金投入,但对农户的土地劳动力投入具有负向影响。不同居民点整理政策对农户土地投入的影响具有显著差异,其中,置换住房的宅基地补偿政策和农地产权稳定政策对农户的土地资金投入具有较好的积极作用,而安置公寓房政策则更可能带来农户土地资金投入减少;农地产权稳定政策和安置公寓房政策显著负向影响农户土地劳动投入,但宅基地补偿政策对农户土地劳动投入影响不显著。本研究对这些结果进行了合理解释,同时也估算了户主年龄、户主受教育程度、农业收入比例、非农就业水平、农业补贴收入、耕作距离和土地经营面积等控制变量对农户土地投入的影响情况。最后从强化规划引导、内涵拓展、宅基地补偿策略优化、土地流转制度完善等方面,提出农村居民点整理政策调整和合理引导农户土地投入行为的对策建议。     

Coal facies characteristics and its control on methane content in South Yanchuan Block,Southeast Ordos Basin,China

The variability in depositional environments in ancient peat bog and coal facies characteristics was investigated with 29 coal samples from four coalbed methane wells in South Yanchuan Block, Southeast Ordos Basin, China. The control of methane content is described as coal facies parameters and the corresponding measurements of methane content. The results indicated that the depositional environment of ancient peat bog in South Yanchuan Block is primarily a lower delta plain, and a low tissue preservation index (TPI) and high gelification index (GI) are typical features of reservoir’s coal facies, reflecting a deep water depositional environment in ancient peat bog. Compared with the coal facies characteristics of the western area, the coal reservoir in the eastern area displays low GI and high ash content as a result of ancient peat bog’s proximity to sea and source area. Various lateral methane contents are influenced by burial depth, whereas the characteristics of coal facies have a strong control on methane content within the single well in vertical direction. The methane content increases with increase in GI and vitrinite to inertinite ratio (V:I), while there are indistinct relationships between TPI and transportation index with methane content. With high GI and longer distance to sea and source area, the methane content in the western area is higher than that of the eastern area. High desmocollinite content also has a negative influence on methane content.