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Composting of poultry manure (PM) can cause several problems, including ammonia (NH₃) emissions. Biochar is a useful material in the composting process due to its microstructure and sorption properties. This research aims to investigate the changes in NH₃ emissions and its relationship with physicochemical properties and the bacterial community during PM composting with different biochar. Seven treatments...
Biochar’s production and application in soils has been suggested as a means of abating climate change by sequestering carbon while simultaneously providing energy and increasing crop yields. However, little is known about biochar’s effect on nitrification in alkaline soil. This study focused on the effect of wheat straw-derived biochar (0%, 2%, 5%, and 10%, w/w) on nitrification in a calcareous clay...
Polybrominated diphenyl ethers (PBDEs), which belong to the class of brominated flame-retardants, are widely used in industrial products. PBDEs have been detected in varied environmental matrices and they can induce various toxicities such as neurotoxicity, cytotoxicity, and endocrine-disrupting effects in animals. The main objective of this study was to investigate the effects of 2,2’,4,4’,5,5’-hexabromodiphenyl...
This work investigated the distribution, partitioning, and ecological risks of 16 polycyclic aromatic hydrocarbons (PAHs) in water and sediment of the Yinma River Basin in China in normal, wet, and dry seasons. Sixteen PAHs were analyzed in 17 paired sets of water and sediment samples collected from the study area. The concentrations of PAHs in water and sediment showed spatial-temporal variations,...
Geological disaster causes loss of lives and damage to man-made and natural stuctures. In this paper, a coupling method with optimal combination weighing law and extension model was established. Based on dynamic impact factors such as forest coverage, annual average rainfall, topography and gemorphogy, geologic structure, and type of rock and soil, the amount of disaster points and human engineering...
Summer heatwaves are expected to be much more frequent and severe with negative effects on terrestrial ecosystem water and carbon budgets, while the impacts on alpine grasslands remain poorly understood. Here we analyzed eddy flux and meteorological dataset of a seven-day (July 26 to August 1) summer heatwave in an alpine humid grassland in northeastern Qinghai-Tibetan Plateau in 2015. Compared with...
Grazing exclusion with fencing has been widely implemented to rehabilitate degraded grasslands in China. However, the response of grassland ecosystems has remained controversial among sites and vegetation types. In this study, characteristics of vegetation and soil properties under degradation gradients (light and middle) and grazing exclusion were examined in the Maqin alpine meadow in August 2013...
Spectral characteristics of optically active constituents (OACs) in waters are key parameters of biooptical modeling. Comparative analyses about the differences of optical characteristics and composition between riverine and reservoir waters in the second Songhuajiang River tributaries were conducted, and the influencing factors impacting on chromophoric dissolved organic matter (CDOM) and organic...
Degradation of shrub meadows and reclamation of alpine meadows may heavily affect the soil sink for atmospheric methane (CH₄), but this is poorly understood. Therefore, in situ measurements of atmospheric CH₄ consumption were conducted in four landuse types: natural alpine meadow (NM), Elymus nutans pasture (EP), herbaceous meadow in shrub (HS), and a P. fruticosa shrub meadow (PS) within two years...
In converting cropland to grassland and forest, more carbon is sequestered in grassland soil and forest biomass, but the mitigation of global warming potential (GWP) is not clear. In this study, we use the longterm conversion from cropland to grassland (28 y) and forest (14 y) to comprehensively assess the impact on GWP of soil carbon (C), nitrogen (N), CO₂, and N₂O emissions. The results showed that...
Hangzhou is in the process of becoming a world-famous city known for its quality of life and advancement of environmental protection. This research evaluates how the city’s surrounding environment is affected by the development of urban wetlands. It is simulated upon the numerical model on an urban scale, with the full advantage of meteorological data and updated techniques related to RS (remote sensing),...
This paper studies the association between concentration of ambient air pollutants and daily mortality number in an urban area of Beijing. Different age and gender groups were taken into consideration. The results showed that, for all the groups, the average daily mortality number showed an increasing trend from June to January of next year, and a decreasing trend from February to June. When the concentration...
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