[Effects of Simulated Nitrogen Deposition on Soil Microbial Carbon Metabolism in Wetland in Sanjiang Plain].

Atmospheric nitrogen deposition has a crucial impact on the structure and function of soil microorganisms of wetland ecosystems. Therefore, carrying out a study on the effects of soil carbon metabolism capacity has a great significance for the protection and utilization of wetland ecosystems. In this study, the effects of simulated nitrogen deposition on the carbon metabolic capacity of soil microorganisms in wetland for five consecutive years was investigated using Biolog-Eco technology.

Organoamine-Directed Assembly of 5p-4f Heterometallic Cluster Substituted Polyoxometalates: Luminescence and Proton Conduction Properties.

The assembly of heterometallic cluster substituted polyoxometalates (POMs) remains a great challenge for inorganic synthetic chemistry up to now. Herein, a series of 5p-4f heterometallic cluster substituted POMs were successfully isolated by a facile one-step hydrothermal reaction method, namely H(Hen)[SbSbLnO(HO)][(SbWO)(PWO)]·28HO(, Ln = Ce, Sm, Eu, Gd, Tb, Dy) (en = ethylenediamine). Interestingly, by replacing en with imidazole, another series of 5p-4f heterometallic cluster substituted POMs H(HIm)KNa(HO)[SbSbLnO(HO)][(SbWO)(PWO)]·26HO (, Ln = Sm, Eu, Gd, Tb, Dy, Im = imidazole) were obtained.

A Series of Cube-Shaped Polyoxoniobates Encapsulating Octahedral CuX O Clusters With Hydrolytic Decomposition for Chemical Warfare Agents.

This study reported a series of cube-shaped polyoxoniobates, {MCuO)(CuXO)(Nb(OH)O)} [M = Nb(1, 2), Ln(3), X = I(1, = 3, = 3; 2, = 5, = 1), Br(3, = 5, = 1)]. As the first octahedral CuXO cluster incorporated polyoxoniobate, the cube-shaped three-shell structure of {MCuO)(CuXO)(Nb(OH)O)} polyanion contains a {MCuO} body-centered cuboctahedron, a {CuXO} octahedron and a {Cu(Nb(OH)O)} cube. Compounds 1, 2, 3 show effective catalytic activities for the hydrolytic decomposition of chemical warefare agent simulants.

[Short-term response of carbon emission to snow cover change in Calamagrostis angustifolia wetlands of Sanjiang Plain, Northeast China].

To understand the response of Calamagrostis angustifolia wetland of the Sanjiang Plain to changes in snow cover, we examined the greenhouse gases emission flux of the removed snow treatment (0 cm, RS), the added snow treatment (50 cm, AS) and the control (20 cm, CK) of a C. angustifolia wetland, and their relations with environmental factors with the method of the static chamber-gas chromatography. The results showed that soil temperature, soil water content, and carbon emissions were lowest during the snow-covering period under all treatments, and gradually increased with time.

A Series of 3D Porous Lanthanide-Substituted Polyoxometalate Frameworks Based on Rare Hexadecahedral {LnWO} Heterometallic Cage-Shaped Clusters.

A series of 3D porous lanthanide-substituted polyoxometalate frameworks, Na[Ln(HO)][Ln(HO)(α-SiWO)]·69HO (, Ln = Sm, Eu, Gd, Tb, and Dy), are built from novel hexadecahedral {LnWO} heterometallic cage-shaped clusters. Intriguingly, every tetrameric {[Ln(HO)(α-SiWO)]} cage-cluster is linked with another eight tetrameric cage-clusters by Ln cations, leading to a novel 3D inorganic porous framework, which exhibits good thermal and chemical stability, excellent water vapor adsorption capacity, and moderate proton conductive properties. Furthermore, the solid state luminescence spectra demonstrate that , , , and display the lanthanide characteristic emission bands.

Responses of greenhouse gas emission to simulated nitrogen deposition in Calamagrostis angustifolia wetlands of Sanjiang Plain, China.

A long-term simulated nitrogen deposition experiment was carried out in Ecological Locating Research Station of the Institute of Nature and Ecology of Heilongjiang Academy of Sciences, with three different treatments including low nitrogen treatment (40 kg N·hm·a), high nitrogen treatment (80 kg N·hm·a) and the control (0 kg N·hm·a). The greenhouse gas emission fluxes were measured using a static box-gas chromatography method, with environmental factors being simultaneously investigated to understand the responses of greenhouse gas emission to the nitrogen deposition in the Calamagrostis angustifolia wetland. The results showed that low and high nitrogen treatments significantly increased the greenhouse gas emission fluxes.

[Fungal Community Structure of Different Degeneration Wetlands in Sanjiang Plain].

To understand the wetland soil fungal community structure and diversity in different degeneration wetlands, the topsoil (0-20) of three different degeneration wetlands were collected in the Sanjiang Plain field experiment station of the Institute of Nature and Ecology, Heilongjiang Academy of Sciences. The distribution and variation of soil fungal diversity were assessed by high-throughput sequencing method. The results showed that Shannon-Wiener index increased from marsh wetland marsh meadow wetland meadow wetland.