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Environmental heterogeneity is a primary factor in determining soil microbial spatial patterns. However, few studies have demonstrated a link between environmental heterogeneity and the spatial patterns in free-living nitrogen-fixing bacteria, which are important in nitrogen cycling. Here, quantitative polymerase chain reaction and terminal restriction fragment length polymorphism were used to determine...
Under accelerated urbanization and high-intensity human activities, the natural wetlands distribution area (NWDA) in Minjiang River estuary faces the great challenge of a deteriorative urban thermal environment. This work aims to analyze the impact of land use/land cover (LULC) on the urban thermal environment and model wetland surface temperature disturbance characteristics during the process of...
Precipitation is an important element in the hydrological cycle in mountainous regions. Temporal and spatial variations in precipitation and in its two phases – rain and snow – over the northern and southern aspects of the slopes of the Tianshan Mountains are compared and analyzed using 55-year data (1961-2015). The results of the analysis are as follows: 1) The average annual precipitation shows...
The acid pre-washing of zero valent iron for improving removal efficiency would deduce the secondary pollution in groundwater, and more fine particles of zero valent iron would reduce the permeability of aquifers. In order to better understand the approaches of nitrate removal, a series of laboratory experiments was conducted in this study. Batch tests showed that washed zero valent iron powder and...
Ecological networks have been considered to be an effective strategy to counter habitat fragmentation, which is occurring in the urbanization context. Researchers and planners have begun to integrate ecological networks in both thematic planning and urban or regional planning for biodiversity conservation and sustainable development. In this paper, we integrated the least-cost path model, network...
Limited information is available for how soil compaction affects carbon dioxide (CO2) efflux under different tillage systems. To improve understanding of the effects of compaction and tillage on soil CO2 efflux, an incubation study consisting of no tillage (NT), moldboard plow (MP), and ridge tillage (RT) was conducted to explore the relationships between CO2 efflux and bulk density, as well as pore...
What is the relationship with environmental factors of phytoplankton community dynamics in saline lakes? We analyzed a data set of phytoplankton community and environmental parameters in seasonal periods (i.e., summer and autumn) in order to describe seasonal variations within the phytoplankton community and its relationship with environmental variables in Chagan Nur Lake on the Ordos Plateau in China...
Numerous efforts in investigating the global carbon balance have concluded that the global CO2 budget cannot be balanced unless a ‘‘missing carbon sink’’ is invoked. Until now there have been considerable uncertainties as to the magnitude of the C-sink in different regions and the contributions of aboveground/underground processes. This study is aimed at presenting a first estimate of the gap between...
This study examines the hypothesis that soil respiration fluxes are always positive, neglecting negative fluxes in arid regions that characterize more than 30% of Earth’s total land area. To cut down uncertainty, we focus on non-vegetated areas at a typical, large arid region (Central Asia). Soil respiration fluxes were reconciled as a direct sum of influxes (CO₂ fluxes entering soils) and effluxes...
Fly ash modified with sodium hydroxide calcination-hydrothermal was used to treat ammonia-nitrogen wastewater. The mount of alkali, the solid-liquid ratio, and the temperature of calcination were investigated in the process of modification. The best modified condition was when the ratio of sodium hydroxide and fly ash was 0.4:1, the ratio of solid and liquid was 1:1, and the temperature of calcination...
Heavy metal distribution in aquatic ecosystems can be influenced by a variety of factors. In this study, the spatial distribution and seasonal variation of heavy metals (Cd, Ni, Cu, Zn, Cr, and Pb) in lake water and sediments of different lake zones of a large, shallow, eutrophic freshwater lake, Taihu Lake, were investigated. Metal concentrations in the river water, bloom assemblages, and macrophyte...
Maize (Zea mays) growing in soil watered with Sb mine drainage (SMD) could accumulate Sb and transferred Sb from roots to shoots. The photosynthetic processes in the leaves were clearly inhibited by SMD. Chlorophyll synthesis was inhibited. Photosystem II (PSII) was sensitive to SMD. PSII activity (FV/FM and PIABS) was reduced due to SMD. Irrigation with SMD resulted in an increase in the proportion...
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